Hyundai Ioniq 5 2023: Retiros, Quejas y Ley de Limón de California

Sin narrativa detallada reportada.

NHTSA #11727345

2023 Hyundai Ioniq 5 displayed a "Check Vehicle Electrical System" warning on the dashboard. The Integrated Charging Control Unit(ICCU) failed, and it rendered the car inoperable. I could not drive it and was left stranded, waiting for a tow truck in below-freezing temperatures as the car completely died. Hyundai has previously recalled the vehicle for this, and my car had been serviced in the recall campaign, so the issue is clear: the recall did not fix this issue. The car has been sitting at the service center for two weeks, waiting in the repair queue behind other Ioniq 5 cars with the same ICCU failure.

NHTSA #11726028

The ICCU unit malfunctioned and needed to be replaced. It occurred while I was driving home and I was lucky enough to make it to my driveway. If it had been on the freeway I would have been stuck.

NHTSA #11726200

I started the car and put down all 4 windows simultaneously. I heard a pop and a dash warning "Check electrical system". I knew this is symptomatic of an ICCU failure and the car will not be driveable for very far. This happened despite having recall work performed for this specific issue in September. That recall work was just a software update, but it is a hardware problem. Hyundai needs to fix the hardware problem. If this had happened when I was at a remote trailhead without cell service I likely would have been stranded. Fortunately I was able to drive 1-2 miles home and get the car towed. I was without a car for 4 days until Hyundai could get me a loaner vehicle. Unknown how long repair will take. Unknown what reliability will be after repair, if they just replace the ICCU with another that has the same potential fault.

NHTSA #11723038

My 2023 Hyundai Ioniq 5 suddenly malfunctioned on Sunday, March 1, 2026. The vehicle abruptly lost power, would not accelerate beyond 25 miles per hour, and then completely died within minutes. This left me stranded on the roadside off the highway, and the car had to be towed to the dealership. It has now been over 10 days, and I have not received any updates regarding the repair timeline, or next steps. This situation is extremely frustrating, as I depend on this vehicle daily. I would greatly appreciate immediate communication regarding the status of my vehicle, including: •Expected repair timeline •What is Hyundai doing to alleviate this massive problem with ICCU? This Hyundai ICCU issue has been around for a few years now, but Hyundai has not provided a lasting fix. Leaving the IONIQ owner to suffer financial and emotional loss. Please get in touch with me as soon as possible with an update, I look forward to NHTSA's prompt response and a resolution to this issue. Sincerely, Dr [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA #11723620

ICCU failure after ~16k miles of ownership. Car cannot charge via AC charging and cannot charge the 12V battery.

NHTSA #11720515

The car gave a Check Electrical System warning when I tried to start it, which disappeared after a moment. When I put it in gear it said limited power, then after sitting on for a few minutes to see what would happen a warning to stop vehicle and check power supply. After towing to dealer it was verified to be a failure of the ICCU. This is the second ICCU failure I have experienced in this car. The replacement part is on back order with no eta.

NHTSA #11720902

Sin narrativa detallada reportada.

NHTSA #11721448

I was driving home from lunch with my wife. A "Check electrical system" alert came up, followed shortly by an urgent beeping with a "Stop vehicle and check power supply." We were able to pull into a parking lot. We called our insurance company for a tow, which showed up two hours later. They took it to the nearest Hyundai dealership. It took three days to diagnose the issue as an ICCU failure, which appears all too common with Ioniq 5s. There's a national backlog on the replacement part, so my car will likely be in the shop for a month to six weeks. A six-week old AGM battery also died. Hyundai wants me to pay to replace it.

NHTSA #11719292

In October, 2025, the car gave the warning notice on the screen 'check electrical system' (or to that effect... i was at home, and put the car in drive, to get to a Doctors appointment. I drove about a mile and another notice came on to the screen to stop the car immediately. I did, and called Bluelink to have it towed (missed my Dr's appointment). The Capital Hydaid dealer in Greensboro, NC, took a day to get back to me, telling me that 'we only have one mechanic that works on the EV and he has 2 cars in front of yours and could not give me a ETA when they might know what was wrong. 5 days later they said it looks like it was something to do with the electrical and they doing diagnostics...a few days I went to dealer (to get some things out of the car) and they told me they were waiting on results. 3 days later I had to get something from the car which was in the same parking place - when I went to them saying it hasn't been moved, they said they were still waiting on Hyundai to proceed. It took almost 10 days and I had to rent a car until they were able to give me a loaner (ending paying for part of the rental because I wasn't told how much my daily rate would be reimbursed. Forward to [XXX]. Same issue, the car on both instances went into safe mode and limped to a safe destination. Towing it to the dealership, they said if it was the ICCU unit, it was on back order and no ETA... so another rental car (they did not have a loaner) and waiting to hear back from them... grrrrrr INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA #11716911

ICCU failed. Car had gone into turtle mode on the highway and was brought to the dealership who could find no problem. Fortunately the ICCU went fully bad at home so safety was not a concern as it could have been. Also I have reported that the lack of a preconditioning button on the touchscreen creates distracted driving. One time I had to wade through navigation menus to disable since I would not make it to a charging station in time (the distance for charge was over 100 miles off). Another time it had to be tricked into turning on because it did not recognize any of the chargers on the NJ Turnpike.

NHTSA #11716464

The vehicle is dead. It won't start, it won't open unlock its doors, it won't do anything. This is consistent with the ICCU failure

NHTSA #11717910

This vehicle underwent an ICCU failure. I heard a pop from the back seat and my vehicle went into a "turtle mode" and had an electrical system warning. Resulted in a tow back from the grand canyon all the way to Phoenix, AZ. This left my girlfriend and I stranded, and caused unnecessary anxiety and discomfort. If this occurred on a highway, the result could have been dangerous. Hyundai has said that only 1-2% of Ioniq vehicles experience an ICCU failure. But from all the evidence and first hand accounts I have heard online this is grossly under reported. Hyundai needs to be held accountable for this failure.

NHTSA #11716501

12 volt battery keeps dying for normal reason. It was replaced last year. I have to jump it a few times a day. I'm afraid it will die while I'm driving. I was told at the dealer that it was because I was charging my car in the cold and the 12 volt battery will disconnect to avoid a fire. It was winter. Now we have in 80 degree temperature and the 12 volt battery is dying more frequently

NHTSA #11723143

Car became unresponsive leaving me stranded with an electrical system error warning which the dealership has confirmed to be the ICCU issue that has been affecting many cars since 2022

NHTSA #11715729

My vehicle lost power as I was driving after warnings from the electrical system. The vehicle was towed to a Hyundai dealership where it was diagnosed with ICCU failure. The ICCU system was replaced by dealer.

NHTSA #11727468

My 2023 Ioniq 5 had the ICCU replacedin 2025 and then it failed again in late January 2026. The car has been at the dealership since then awaiting a new part.

NHTSA #11726622

On the morning of January 23, 2026, the ICCU Assembly and fuse failed when driving on a freeway in moderately heavy traffic. I was driving about 55 mph when I heard a pop from somewhere behind me. A warning message came on the display to check the electrical system along with a battery symbol. The car lost power. Losing power like that on a freeway was not at all safe. It could only go about 25 miles per hour. I had to drive on the shoulder of the freeway with my hazard lights flashing until I reached an exit ramp to get off the freeway. I parked on a side street in a residential area where I felt safe, turned off the car, and waited. I turned it back on. The message was still there so I called for a tow. The 12-volt battery was completely dead by the time it got to the dealers and had to be jumped to be able to park it. The original ICCU had already been replaced in November of 2024, so this was a failure of a replaced part. The car was at the dealer for 19 days before it was repaired due to the wait for the parts to be shipped. What component or system failed or malfunctioned, and is it available for inspection upon request? The ICCU and fuse failed but I don't have the part since it was replaced by the dealer. How was your safety or the safety of others put at risk? Losing power on a freeway when cars are traveling at high speed is not at all safe. I could have been rear-ended. Luckily I was able to get to the freeway shoulder without incident and travel on the shoulder to get to a safe place. Has the problem been reproduced or confirmed by a dealer or independent service center? Yes. They diagnosed it and replaced the failed part. Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? Unknown. Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? No. The warning message popped up at the same time as the loss of power.

NHTSA #11721059

The ICCU electrical system failed for the 2 nd time owning the car. Resulting in another 2 month wait to get it repaired. The dealer says they put the same part in, that may fail again.

NHTSA #11725443

Car experienced ICCU failure. It tripped my 50A breaker at the fuse panel and damaged my EVSE. Car has been sitting in the shop for 3 weeks with NO eta insight (Dropped car off on Jan 20th, 2026). The service center tells me there are 20 Ioniq5s ahead of me still waiting on ICCU replacement parts. NHTSA and other articles have estimated 2-10% with ICCU failures but the problem appears to be much higher than this! I am very disappointed and hope NHTSA.gov will help us to push Hyundai to find a root cause instead of sweeping it under the table claiming less than "1%" are affected.

NHTSA #11718496

The contact owns a 2023 Hyundai Ioniq 5. While driving at an undisclosed speed, the vehicle shut down unexpectedly, leaving the contact stranded for several hours. A RED warning light was illuminated, indicating an electrical failure, followed by the battery warning light being illuminated, leading to the loss of power. The vehicle was towed to the nearest dealer to be diagnosed. The dealer determined that the Integrated Charging Control Unit (ICCU) needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the issue. The failure mileage was approximately 28,000.

NHTSA #11712157

The car became inoperable after a "Check EV" warning appeared. The vehicle had to be towed to the dealership. Fortunately I was able to avoid an accident. The dealer tells me that the ICCU (Integrated Charge Controller Unit) failed which was part of an earlier recall that I took the car in to the dealer for and they only updated software but now the related hardware has failed afterwards. This is something that is extremely unsafe if it happens while driving. Hyundai needs to correct this with an improved and safe ICCU.

NHTSA #11713880

I received a "Stop vehicle and check power supply" alarm on my dash after starting the car and leaving a parking garage. Then a "12V battery voltage low" message along with the "turtle mode" icon which limits the car to under 20 mph. I pulled over to a side street as I did not want the car to die on a main road and impede traffic or get hit. I called roadside assistance and the car was towed to the dealership.(1/16/2026). On Tuesday (1/19/2026) I was informed that the ICCU (Integrated Charging Control Unit) had failed. The dealership ordered the part(s) to be replaced and stated 5-7 days turnaround. Called dealership every 10 days or so, but was told there was no ETA for the parts delivery. On Thursday 3/6/2026 (48 days) received a text that the car was ready to be picked up. The ICCU and associated fuse was replaced.

NHTSA #11722410

The car stopped being able to charge on AC level 1 and level 2, only able to charge on DC Fast. Took it to the dealership and they diagnosed an ICCU failure, rendering it undriveable. The part is under warranty but is backordered. I have already been waiting for 14 days, and they have no update for when they'll get the part in.

NHTSA #11713617

ICCU failure at just 10k miles. Was driving, car kind of "jolted" and warning came on screen saying "check electric vehicle system" then warning said "stop vehicle, check power supply." So I limped to a stop and got a tow. It sounds like an increasingly prevalent issue even though my specific VIN did not have an open recall. Does not sound like Hyundai is taking this seriously.

NHTSA #11708885

Pulling car out of my garage onto the driveway heard pop from rear of vehicle and display of "Check electric vehicle system" message. My OBD2 scanner reported the P1A90 ICCU failure code. Vehicle was current on all recalls and has been regularly Hyundai serviced since purchase January 2023. After consulting with dealer, car was towed to the dealer. Awaiting notification on repairs. How many more owners need to go through this without a full NHTSA directed recall???

NHTSA #11708890

Car lost power on highway, power lost.

NHTSA #11710198

I purchased the 2023 Hyundai Ioniq 5 Limited edition car on 12/20/2025. On 01/03/2026, a warning light came on and said I needed to check my electrical system. I drove 3 miles home and made an appointment with the Hyundai dealership on 01/05/26. On the morning of 01/05/26, as I was attempting to drive the car to the dealership, a turtle symbol appeared on the dashboard and said power limited. Three blocks later, the warning sign popped up that said pull over immediately. I pulled over as far as I could but the car completely died right in front a no parking sign. I had to wait for three hours in the freezing cold to get the car towed to the dealer. After two days, the dealer confirmed that the ICCU unit had failed and it would be replaced under warranty. One month later, I still do not have my car back, as the part is on backorder. Luckily, we had not taken this car to the mountains 1 week prior, or we would have been stranded in the freezing cold with minimal cell phone reception.

NHTSA #11715364

On 1/3/2026 I attempted to charge my car using my at-home level 2 charger. When charging initiated, the breaker tripped. I reset the breaker and tried again, but the same issue repeated. I attempted to charge my car by plugging directly into a GFCI outlet using the level 1 charger that came with the car, but this tripped the GFCI breaker. I had enough battery to drive to the dealer, and Hyundai diagnosed the issue as an ICCU failure. In my particular case, I wasn't put in danger, since the failure did not occur while driving. But this model and other models based on this platform have experienced a pattern of failures with this component. In some cases, the ICCU fails while driving in such a way that the car goes into a limp mode before becoming inoperable. I'm grateful this did not happen to me. I felt it was important to report this issue if only as a record of one more ICCU failure associated with this model.

NHTSA #11715391

AWD functionality of car broken. Had to get traction motor replaced.

NHTSA #11727344

Our 2023 Hyundai Ioniq 5 had the ICCU software update recall and subsequent complete failure of the ICCU, which was repaired. Yesterday the car again warned us of the 12v system failure and rendered it not only undrivable and unstartable, but also unlockable in the public parking area where it still sits awaiting a tow to the dealer tomorrow (they are closed on New Years Day. This is the second time the ICCU has failed, rendering the car totally inoperable and in this case stranding my wife in freezing cold.

NHTSA #11708208

On the drive home the car dinged at me and put up the "Power Limited" message with the turtle icon. This limited me to 15mph maximum, so I ended up driving home in the shoulder as the roads are 50mph roads and would have created a major incident if I tried to stay in the lane. I was within a mile of my house so I limped home and pulling into the driveway the car switched to "Check Electrical Systems" and "12V battery voltage low. Stop Safely" as I pulled into the garage. This was at 8pm so I was not able to do anything else. I was able to have Hyundai Roadside Assistance tow the car, which did turn on next day in the morning to pull out of the garage and turn around. The car sat at the dealership for a week until they were able to look at it an confirm that the ICCU was broken. This happened right before New Years so I get taking a week to look at it. Right now they mentioned the part is on backorder and there is no schedule for repairs. This is a major issue for this line of cars and needs to be resolved. The car is not safe to drive long distance as this is the second time this has happened. For a 2023 model year it is almost a yearly occurrence now. My warranty will run out by mileage in ~44k miles and at that point this defect will be my responsibility.

NHTSA #11709626

The ICCU (Integrated Charging Control Unit) failed. I could not charge with my level 2 charger and dealer confirmed that the ICCU unit was bad and needed to be replaced. I have been waiting over a month for the part and repair.

NHTSA #11717054

The ICCU failed, leaving me stranded 4.5 hours from home. Luckily I was able to tow the car to the nearest dealership and they gave me a loaner. It has been 6 weeks and no update yet.

NHTSA #11716075

The contact owns a 2023 Hyundai Ioniq 5. The contact stated that while driving 4 MPH, the vehicle lost power and stalled a mile from the residence. The message "Check Electrical System" was displayed. The hazard light was activated but quickly became inoperable. The contact called AAA towing, where a power booster was attached to the vehicle, and the vehicle was restarted. The contact was able to drive back to the residence. The AAA driver indicated that he had towed eight other similar vehicles to the same local dealer. The vehicle was towed to the local dealer, but was not diagnosed or repaired. The manufacturer was not contacted. The failure mileage was approximately 16,000.

NHTSA #11708336

The 12 V battery failed within two years of the delivery of the car. I believe this is due to the design of the charging unit within it as many other others report the same problem.

NHTSA #11714844

ICCU failed causing car to be unable to be charged. If driven any further it would have eventually stopped working.

NHTSA #11707829

On December 23, 2025 while driving at 50 mph the car displayed an electrical warning and would not let me drive more than 40 mph. When I drove it to the dealer on December 27 (because the dealer said I had to wait until after Christmas ) it would not go over 20 mph. The vehicle has been at the dealer awaiting an ICCU part since December 27, 2025. Over 50 days!

NHTSA #11718203

The ICCU of my vehicle failed and couldn't charge using AC power which also caused my 12V battery to fail. The car has had the old recall completed month prior to this failure so Hyundai didn't replace the defective part just updated software in hope the defect wouldnt happened. Regardless the defect happened and the car while still under warranty has not been fixed in 57 days. Hyundai states my vin has no ETA for part to be delivered and fixed.

NHTSA #11720400

Got "check electric vehicle system" warning message when backing into my parking space. Later, when I turned car on to leave, it went into limp mode in the parking lot. Had car towed to Lithia Hyundai of Reno. ICCU failure was determined.

NHTSA #11706204

My vehicle has experienced three separate failures of the Integrated Charging Control Unit (ICCU) and two separate 12-volt battery failures. All manufacturer recalls related to the ICCU have been completed. Each of these five events required towing and resulted in either an inability to start the vehicle, or a sudden loss of power while driving, including limp mode. During multiple events, the vehicle displayed a warning message stating “Stop vehicle and check power supply” accompanied by a red battery icon. The sudden loss of power created a serious safety risk to me and to others on the road, particularly when the vehicle lost propulsion unexpectedly. In each case, the vehicle became unsafe or impossible to operate. For every incident, the problem was diagnosed by authorized Hyundai dealer, and I was informed that the issue had been repaired. Despite these repairs and recall actions, the same failures continued to occur. These repeated ICCU and 12-volt battery failures demonstrate an ongoing electrical system defect that has not been permanently corrected and presents a continuing risk of sudden power loss.

NHTSA #11706217

ICCU failure after initial recall

NHTSA #11714051

twice this car has has experienced iccu failures. both time the car was on the road traveling when electrical system failure warning was alarm. last incident had to stop along road and towed to hyundai shop

NHTSA #11714820

ICCU failure. All recalls had been performed prior to failure. Vehicle showed the following warnings: "12 volt battery low", "stop safely", "check electric vehicle system", "stop vehicle and check power supply". Replaced 12-volt battery, still showing error messages, unable to be driven, required a tow to the dealer. OBD-II scan showed error P1A9096, confirmed by dealer as an ICCU malfunction.

NHTSA #11713655

12 volt battery dead. Interior lights don't come on. Vehicle won't start. 1. 1/8/24: orange 12V light coming on repeatedly, meaning battery not charging. Dealer, Hyundai of Cool Springs, found battery would not hold charge. Replaced battery. Afterwards, orange light still came on sometimes, but dealer advised to ignore it. 2. NHTSA recall for ICCU software problem affecting battery charging, Hyundai Recall 257/021G. Dealer fixed problem 3/28/24, 41D043R0 .4. Afterwards, orange light still came on sometimes, but dealer advised to ignore it. 3. Hyundai recall #9B5 of 8/1/24, software problem in VCMS affecting battery charging. Dealer, Hyundai of Cool Springs, updated VCMS 40D097R0 .3 on 9/10/24 Afterwards, orange light still came on sometimes, but dealer advised to ignore it. 4. NHTSA Recall 24V-868 of 11/18/24, ICCU causing battery not to charge. Dealer, Hyundai of Cool Springs, updated VCU and ICCU, 40D229R0 .7 and 41D225R0 .4 on 1/23/25. Afterwards, orange light still came on sometimes, but dealer advised to ignore it.

NHTSA #11695575

The ICCU failed after completing all required recalls. The car stopped working while driving. The car losing power while driving could have created an accident had I not pulled over in time. The part was replaced by Hyundai under warranty and is now fixed.

NHTSA #11725580

A water bottle spilled from back seat during sudden deceleration due to traffic. Thd bottle hit the back of the drivers seat and some of the contents spilled, I felt moisture from under seat on my ankles. Shortly after the car systems started reporting they were not working. By the time I returned home not even the turn signals worked and I could log turn off the EV. Car towed to desler who determined there are critical electrical connectors under the seat that showed signs of a short and corrosion. This is not covered by manufactures warranty and thd dealer presented me with an estimate over 11,000 to replace the drivers seat and floor wiring harnesses. I also filed a chain under my comprehensive insurance which was denied as the insurance company believes the corrosion was ongoing vs an all of the sudden issue. I believe the Ioniq has design flaws as critical connections should be better protected. Kids in thd back seat and front seats can frequently spill things and this fat seems way to fragile with this type of design. This problem occurred October 9th and the car is still with the dealer I need help please.

NHTSA #11700999

The car stopped trickle charging even though it wasn't at 100%. When I turned it on, there was a warning message indicating an electrical failure. I called the dealership and they said it was unsafe to drive it the 2-3 miles to the dealership so it had to be towed. Once it was diagnosed, the dealership told me the ICCU had failed. This is a known defect in this car that for some reason has not been resolved with the previous recalls, and the replacement units that are installed are just as prone to failure as the original. It is expected that I will have the car back approximately one week after it was towed to the dealership.

NHTSA #11692395

ICCU and 12V both failed

NHTSA #11708559

Component or System Involved: High-voltage battery system — fault code P1AA700. The vehicle is currently located at an authorized Hyundai dealership and available for inspection upon request. Safety Risk: The vehicle became undriveable due to a potential high-voltage battery failure, posing a significant risk of electrical hazard or loss of propulsion. I was advised by the dealership not to drive or retrieve the vehicle due to safety concerns. As the sole user of the vehicle in a household with children and daily transportation needs, this created a severe disruption and risk to personal and family safety, especially if the issue had occurred while driving. Confirmation of the Problem: The issue has been confirmed by the dealership, who retrieved the fault code. However, they are unable to complete diagnosis without Hyundai Corporate’s “Techline” technician, whose response is still pending as of this report. The vehicle has been at the dealership since June 30, 2025. Inspection: The dealership has begun inspection but cannot complete diagnosis or repair until Hyundai Corporate provides guidance. The vehicle has not been inspected by police or insurance, but it is under review by Hyundai’s technical assistance team. Warning Messages or Symptoms: Yes — prior to the failure, the vehicle displayed dashboard warning messages related to the high-voltage battery system, and the drivetrain became unresponsive. These warnings appeared just before the vehicle became unsafe to operate.

NHTSA #11671632

The Integrated Charging Control Unit of the fully electric Hyundai Ioniq5 stopped working while I was driving my son home from the Zoo. I got a warning that there was an electrical system issue and I needed to immediately stop the car. The car lost power quickly, and I was luckily able to pull over into a parking lot and await a tow truck. This is a chronic saftey issue with Ioniq 5s and needs to be addressed.

NHTSA #11669122

The ICCU failed while I was driving on the interstate, resulting in a loss of power. The car had to be towed. I waited 2 hours on the side of the freeway.

NHTSA #11665583

The ICCU died, causing the car to stop working while I was in traffic. This represented danger to me and my passenger, as well as other vehicles on the road. The car is currently with the dealer awaiting a new part.

NHTSA #11662757

The ICCU in my 2023 Hyundai Ioniq 5 failed unexpectedly, despite the vehicle having completed all applicable recall campaigns intended to address this issue. The failure resulted in a sudden loss of power, with multiple warning messages appearing on the dash (e.g., “Check Electric Vehicle System”) and the inability to drive or charge the vehicle. This posed a serious safety concern as the vehicle became disabled without warning. This issue is known among Ioniq 5 owners and appears to persist even after recall software updates or prior service actions. It raises concerns about the effectiveness of Hyundai’s recall remedies and the reliability of the ICCU hardware itself. The problem poses a potential safety risk due to the loss of propulsion, especially if it were to occur at highway speeds or in high-traffic environments. Requested Action: I urge NHTSA to investigate the continued failure of ICCU units post-recall and whether current recall remedies are adequate to ensure long-term safety and reliability.

NHTSA #11661905

I am filing this complaint regarding a serious safety defect in my 2023 Hyundai Ioniq 5 that occurred on 5/14/2025. The vehicle experienced a complete failure of the 12-volt auxiliary battery while parked in my driveway. As a result, the vehicle became fully unresponsive (“bricked”), and I was unable to open the passenger side front door, either of the rear passenger doors, or the back lift door. Only the front driver door could be opened manually and it had been unlocked at the time of the battery failure. I suspect that if I had locked the door prior to the battery failure I would have been locked in the car and I would have had to call for emergency help. This failure posed a significant safety risk, as passengers or I could have been trapped in the vehicle if this had occurred while on the road, in an emergency, or in a remote location. Larger or mobility-impaired passengers would likely be unable to exit safely through the narrow front passenger side if I had been able to open it. Even if I had broken the windows, it is unlikely that larger people could have escaped. There are no mechanical release mechanisms for the doors, and no clear emergency override was functional during this failure. This issue is further exacerbated by the fact that: •The Ioniq 5 relies entirely on the 12V system for door actuation and vehicle wake-up, even when the high-voltage battery is full. •There is no redundancy or mechanical failsafe for opening all doors in a total electrical failure. I have since lift wheel towed the vehicle to the Hyundai of Escondido where the 12V battery was diagnosed as faulty and replaced. The service representative acknowledged other similar occurrences and acknowledged there has been no permanent resolution or acknowledgment of the inherent design risk in such scenarios. This is not an isolated case — numerous owners have reported similar issues across online EV forums and to NHTSA. The lack of emergency door egress is a unexcusable defect.

NHTSA #11661743

ICCU failure. Car is held by Hyundai dealership for over 4 weeks, waiting for replacement part from Hyundai. Need car now. Recalls were announced in South Korea by Hyundai Group for the same part creating safety and reliability concerns for American owners.

NHTSA #11665669

During level 2 AC charging the circuit breaker in the house tripped. Tried again on a level 1 charger that came with the car and again it tripped the home circuit. Again, the car overloaded the house electricla system to a point it tripped the circuit breaker. Car taken to dealership for repairs. Dealership trouble shooting identifed failed ICCU with burnt connecter pins. HyundaiCase Management number 42152269 THIS IS A FIRE HAZARD FOR THE CAR AND HOUSE.

NHTSA #11720282

First time this occured we were driving in the winter and the car randomly shut down and started saying "Electrical Fault" or something of the sort. Turns out it was an ICCU issue. We got this replaced last year. Turn around 6 months later and the same thing happened again, but in an intersection. From my understanding when the ICCU fails the entire car basically goes into limp mode and prevents you from driving. Super dangerous and very hard to trust moving forward. Both of these issues have been confirmed by the dealership.

NHTSA #11720012

ICCU failure, left stranded for a tow

NHTSA #11725930

There was sudden power reduced and turn to the limp mode(Turtle symbol popped up). After pull over my vehicle to highway shoulder, the vehicle became total power loss. Unable to drive anywhere. It was a dangerous situation for my family. We waited tow car and took my vehicle to Hyundai dealership which located close to my house. They diagnosed my car and after a day. They told me it needs to be replaced a ICCU assembly and Fuse. There was no ETA for the parts. They provided me a loaner’s car. After about 15 days, they fixed and I was able to take my car.

NHTSA #11730155

While driving my 2023 Ioniq5 I got a warning on the dashboard about losing power and immedately the car slowed itself down to about 15 MPH, once I was able to get to a safe spot to pull over I stopped the car and it would not start again. I had it towed to the dealer and it has been a week and the ICCU is still on backorder. No idea when I will have the car back.

NHTSA #11713769

Vehicle experienced sudden loss of power while driving at highway speed. While driving on the interstate at highway speed in dark, snowy, high-traffic conditions, the vehicle displayed a warning about an electrical system fault and instructed me to “stop safely.” The vehicle immediately lost some propulsion and ramped down speed. We were only narrowly able to exit the highway before it would not move further. We were very lucky that no one hit us- it is extremely unsafe to drastically decrease speed on highway. Our family was in the car and it was very, very scary. We were able to use the heating system while parked for a few minutes before we lost all power completely. The vehicle was towed to a Hyundai dealership and is completely inoperable. The service manager stated the failure is consistent with a known ICCU (Integrated Charging Control Unit) failure. The dealership reports having many Ioniq vehicles with similar ICCU failures awaiting backordered parts, with no estimated repair timeline.

NHTSA #11712173

ICCU failed at 20,000 miles, 2 years after I first got the vehicle. Blue link showed the P1a9096 ICCU code failure. Car could not be driven for more than a few minutes then the message to stop safely came about and car would die. It took the dealer 2 months to replace the ICCU with the SAME defective part. It is only a matter of time before it fails again.

NHTSA #11734215

Upon entering vehicle in the morning of 12/30/25, a notable smell was first present. After turning on the vehicle, the car dashboard showed a "Check electric vehicle system" warning. The car was not able to be put into any gear besides neutral. Car was towed to dealership, and received word on 1/2/26 that an ICCU failure was the cause.Thankfully this occurred while parked in my garage, so was not in immediate danger. Perhaps this isn't a safety issue, but I am not sure what would have happened had the ICCU blown while driving so thought worth reporting.

NHTSA #11708407

Car gave an error check electrical system and went into limp mode on highway slowing to 25mph.

NHTSA #11707186

The ICCU failed which prevented the car from moving. ICCU was replaced by dealer under warranty. Had to be towed from the roadway.

NHTSA #11666681

The ICCU in my car has failed twice, within an 8 month period. (this submission is to report the 2nd occurrence) At each occurrence, after starting the vehicle, a loud pop was heard. The pop sound is known to be the fuse in-line with the ICCU. After driving the car a short distance, the dashboard displayed warning messages to "Check Electric Vehicle System" and to pull the car to a safe area. Fortunately, I was not moving fast and I was able to get the car safely parked within a few minutes.

NHTSA #11713973

The ICCU component popped and blew seconds before I entered the on ramp for an interstate. My car immediately entered "turtle mode" and capped my speed at 10 mph. I crossed 4 lanes to get out of the turn ramp and get to a parking lot. The car alerted and stopped driving as I pulled into the lot. The car provided no warning before and has the 3 prior software recall fixes. It was unsafe for the car to suddenly stop working. 30 seconds more and I wouldn't have been able to pilot the car to a safe spot. Dealer has car and confirmed that the ICCU is blown and destroyed the 12v battery, which is less than a year old. They were willing to provide it to you. It is still at the dealership, as Hyundai national stopped shipping replacement ICCUs apparently in January.

NHTSA #11718228

Vehicle stopped charging and will not charge using a level 1 or level 2 charger. It will charge at a level 3 charger only. Took it to a Hyundai dealership and they did a software update and said it was fixed. Took it home and still would not charge. Took it to another Hyundai dealership and they said it was an ICCU issue they had been seeing and it would need to be replaced. I have read from many other Hyundai Ioniq 5 owners about the ICCU being a weak point in the car and having to have it replaced, some multiple times. When I tried to charge with my level 1 charger at home, it tripped the breaker, which is concerning. The message on the dash was simply, "check battery system".

NHTSA #11717617

ICCU failed 12/29/25, car inoperable and towed to dealer. Luckily this was in my garage , had it been on the freeway it would have been very dangerous and car goes into limp mode. Car red battery light and made chimes. Only has 25,000 miles on it. Has been at dealer since then with no resolution update.

NHTSA #11715172

While driving on the freeway I heard a pop and a saw a warning notification on the dashboard to check the vehicles electrical system. This was followed by a warning that power was limited which resulted it the vehicle speed decreasing to 30mph, and finally a notice to stop the vehicle immediately. All of this occurred in about 5 minutes time. Thankfully, I was able to pull over to the side of the road without an accident. After this the vehicle became inoperable including hazard flashers. I had to wait on the side of the freeway for about an hour to get a tow. The vehicle was towed to a dealer which confirmed that the ICCU and high voltage fuse were faulty. My safety during this process was put at risk because A) during a snow storm I had to pull the vehicle over to the side quickly across 4 lanes of traffic and B) then remain parked on the shoulder with limited ability to notify other drivers that I was on the shoulder. The dealer has confirmed the failure, the vehicle is available for inspection, and the manufacturer has not inspected the component.

NHTSA #11703048

Car won't charge on Level 1 charging; it popped the GFCI in my garage and now no longer charges on level 1 (regular slow AC charging).

NHTSA #11692944

The Integrated Charge Control Unit failed despite having all related recall repairs/actions implemented. Failure occurred while pulling into a parking place after completing level 2 charging to 80%. The failure has not yet been confirmed by the dealer, but all common symptoms match this failure including hearing a pop sound from the rear of the vehicle followed by “Check Electrical System” indication and limited distance low power, low speed mode. Had this happened while driving at highway speed, the sudden loss in power and speed could have been dangerous to respond to and get off the highway safely. The vehicle is scheduled to be inspected by the dealer shortly.

NHTSA #11672509

This morning I heard a "pop" sound from the back of my 2023 Ioniq 5. A short while later a warning message appeared about the cars electrical system. A minute or two later a "Stop Vehicle and check power supply" message appeared. The infotainment screen said "A possible condition has occurred with your vehicle. A full system check is recommended TODAY." This is likely a malfunction of the ICCU. I have already taken this car in 2 or 3 times for recalls related to the ICCU, including one dealership visit within the last 30 days. As this is an electrical vehicle, electrical problems could leave me stranded. Without propulsion I would be at risk of getting hit on the highway. The same error message appeared at the service center. The car has been at the dealership all day, and I don't expect to get it back anytime soon. There was no warning of the failure before today.

NHTSA #11657639

Entered car on very cold day. Put heater and defroster on high, drove about a mile and then the window cracked.

NHTSA #11723241

My car has suffered two ICCU failures despite going through all of the Hyundai recalls. Through the so far 30 months of my lease, the car has been non-operational for close to 5 months. The car is still currently in the shop awaiting delivery of the replacement parts, but there is absolutely no ETA being provided. As I understand it, this is a common issue with this model and given that it is the second occurrence for me personally, it doesn't seem like Hyundai has a good grasp on how to deal with the issue and give consumers a functioning vehicle.

NHTSA #11719352

The car was fully charged and all of a sudden displayed a limited power warning and stopped driving completely. We were stuck on a road and had to get a tow truck. The tow truck was able to get power to the battery to drive it up on the bed. It was fully dead -couldn’t even unlock the doors. It’s been at Hyundai for 3 days and they are replacing the ICCU fuse. From what I read this is a very common issue

NHTSA #11702826

I am reporting a safety concern with my 2023 Hyundai Ioniq 5 related to Hyundai placing remote safety features behind a paid subscription. Hyundai has locked two functions that affect safety: (1) the ability to remotely check the vehicle’s battery state of charge, and (2) the ability to remotely unlock the doors from a phone. These functions previously existed under BlueLink but were removed unless the owner pays for the new Connected Services package. 1. Remote battery status Without paying the subscription, I cannot check the vehicle’s battery level while it is charging. If I need to leave the charging area or am charging from home and not directly watching the dashboard, there is no way to verify whether charging completed or stalled. Charging interruptions are common with EVs. This could leave me stranded unexpectedly in unsafe conditions, at night, or in severe weather. This is a safety issue, not a convenience issue. 2. Remote unlock Hyundai also removed the ability to unlock the car from my phone unless I pay for the subscription. This creates a safety hazard if a child accidentally locks themselves in the car with the key fob inside. Without remote unlock, the parent may have to break a window or wait for emergency responders, which creates risk of heat or cold exposure to a child. This problem is reproducible every time I attempt to use the app without a paid subscription. Hyundai has been contacted and has not offered a safety solution except paying the subscription fee. I am asking NHTSA to review whether locking basic safety functions behind a paywall creates a safety defect that could put vehicle occupants at risk.

NHTSA #11704625

I own a 2023 Hyundai Ioniq 5 that experienced a battery failure while still under warranty. The vehicle became completely undriveable in late November 2025 and had to be towed to a Hyundai dealership. The vehicle has now been sitting at the dealership for more than 90 days waiting for a replacement battery with no repair completion date provided. The dealership indicated that the required battery component is unavailable or on extended backorder. While a loaner vehicle was provided, the original vehicle remains unusable for an extended period due to a major battery defect. This raises concerns about reliability and the availability of critical components needed to repair electric vehicles when failures occur.

NHTSA #11722334

ICCU Unit went bad in 2025. Car totally dead. Jumped, taken to dealership, about 1 week to fix ICCU and blown fuse. A couple months later car totally dead again. Now bad battery. I am concerned about driving anywhere now. Was stranded last time it totally died. 75 year old female, should not have to pay $699 a month for iffy Ionic 5 and rent a dependable vehicle if I travel to visit friends and family.

NHTSA #11712876

The ICCU failed. I heard a popping noise, an error “check electric vehicle system” appeared on the dash, and i lost propulsion. I had my car towed to the dealership, where they eventually confirmed the ICCU failure.

NHTSA #11718544

After having service done for the past two ICCU recalls months and months ago, I’m driving along today and hear the loud pop that everyone else reports. My car immediately went to a reduced power state where I was able to limp a bit further until I lost all power. I had to have the vehicle towed (by a wheel lift/dolly equipped wrecker - do not allow a flatbed they’ll drag your car into the truck) to the nearest dealership and now await to hear how long I’ll have to be without it.

NHTSA #11714617

High-voltage battery system failure causing complete loss of propulsion. Vehicle entered "turtle mode" (reduced power warning) at 25% charge, then became completely immobile — unable to move even on flat surface. This has occurred multiple times. Charging system displays "fully charged" within one minute while vehicle dashboard shows 60% — clear battery management system malfunction. Vehicle has been undriveable and awaiting battery replacement for over a month at this point with no information on when the battery will arrive or be in stock. This is a known widespread defect in Ioniq 5 vehicles. Multiple owner reports document the same battery system failures, extensive reports of ICCU failures, and Hyundai's solution is to replace these failing components with the same component that fails repeatedly in other vehicles. No permanent fix or design change has been issued. This is a critical safety defect. Vehicle becomes completely immobile without warning — total loss of propulsion in traffic creates immediate crash and stranding risk. False charge readings mean the vehicle cannot be trusted to complete any trip safely. I have been left stranded multiple times on the turnpike of 80mph speed limit due to sudden total system failure. Hyundai has not resolved the root cause. They continue replacing batteries with the same defective system. This vehicle is fundamentally unsafe and unreliable. I should not be required to drive a vehicle with a battery system documented to fail catastrophically and repeatedly. Service records and repair invoices available upon request — vehicle currently at dealer awaiting battery replacement.

NHTSA #11715479

INCIDENT DESCRIPTION: On November 24, 2025, while driving at ~60 mph on NYS Route 17 (highway) with ~15% battery charge, my 2023 Hyundai IONIQ 5 suddenly entered limp mode and lost motive power. The high-voltage battery state of charge dropped instantly from ~10-15% to 0%, triggering error code P1B9600 (HV battery cell imbalance—cells failing to charge/discharge properly). I was unable to fully remove the vehicle from the roadway. My elderly mother was a passenger; a passing tractor-trailer came within 1 ft of striking us when disabled. NY State Police responded (report available). Required $300 tow to the Hyundai dealer, stranding us 150 miles from home.//PRIOR RELATED FAILURES: 1. November 14, 2025: Stranded due to ICCU failure (recall 24V-868 related) (stranded on NYS State Route 444). 2. September 15, 2025: Same P1B9600 code/limp mode/power loss; stranded in the middle of active travel lane of NYS 444; NY State Police report filed. 3. August 2025: Initial HV battery-related sudden power loss; stranded on Interstate 90 Eastbound (Erie, PA area). Despite repairs (September 2025 ICCU/"limp mode" software updates; October 2025 ICCU/high-voltage fuse replacement under recall 24V-868), defects persist. The vehicle charge rate also appears low and the battery consumption rate seems high.// CURRENT STATUS: Dealer (Vision Hyundai) confirmed high-voltage battery pack defective, requiring full replacement. Vehicle purchased new October 2024, under warranty. In service since mid-November 2025 (>30 days downtime). Provided loaner now, but prior rentals unreimbursed.//SAFETY RISK: Repeated sudden power losses create extreme highway crash risk, especially with vulnerable passengers. I am a licensed professional mechanical engineer, and can provide technical logs, repair orders, police reports upon request.The issues I have experienced appear to be linked to ongoing ICCU/HV system issues in IONIQ 5. I respectfully request expansion of the recall investigation.

NHTSA #11706423

On 11/7/25 , we were driving my 2023 Hyundai Ioniq 5 to a friend's home in rural [XXX] , a trip of approximately 160 miles. At around 5:00 PM, we stopped about halfway to our destination to charge the battery. The car would not charge above 47%. While we continued to attempt to charge the battery, the console displayed a Check Electrical System Warning message, and we received the DTC P1AA700 via BlueLink. We were concerned about our safety on the drive up to the mountains. We were afraid the car would stop running on the highway and cause an accident. We were also concerned the car would die in a remote area and we would be stranded. However, the dealership was closed for the weekend. We drove carefully to our friend's home. I contacted Stevens Creek Hyundai on 11/10/25 and arranged to bring the car in on 11/11/25. It had 13,652 miles on it at that time. Eventually, the dealer confirmed the DTC P1AA700 and said they would need to order a new EGMP battery. The car was in the shop for 128 days, waiting for Hyundai to "build a battery" in [XXX] . Eventually, Stevens Creek Hyundai replaced the EV battery and I picked up the car. Given the delay in repairing my car and the growing evidence of Hyundai battery failures, we wanted to report this problem to the authorities. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA #11729574

Vehicle warning alarm came on with message to immediately pull over and check power supply. Towed car to dealer where ICCU and fuse were replaced. This after 1-2 recalls were completed.

NHTSA #11664301

ICCU failed while driving, car limited speed immediately. This was after software recall was preformed a few months prior. Car went limp mode and repairs are going to take an indefinite time.

NHTSA #11711010

I purchesed the Hyundai ionic 5 2023 from hyandai dealer ship. It had 42 k miles. The car ran good. So I got it. They promised me before the I bought they would charge it up free. When I signed the paper they said they couldn't charge it for me. I drove 5 miles the original battery died. I almost got to accudent only 5 miles away. I figured it was original battery. I change battery. I get tow truck to take home i put new battery in it. Then 5 days later the main iccu stopped charging. Another 12 bolt battery drain. They new it had that problem. Two batteries are main iccu won't charge. They make me sign paper buy as is i didnt think it would die 5 miles later they new it had a serious problem I look on internet the same car had recalls for the same car not on mine My car should have been recalled I heard 1000 s were affected with the same problem. They new it would fail on me thars why they get me to sign the papers. I hooe it's not 21 k down the drain I hope i dont have to spend 15 k on new iccu.

NHTSA #11707636

Car lost charge quickly, went into limp mode while I was driving on the highway. I had to pull of the road several times and try to get it to a charging station. It barely made it after the lose of power. Charged it to 80% and it would only go up to a range of 100 miles. Took it to the dealership and they confirmed it needed a whole new main battery. ICCU had already been replaced. Had to wait over 5 months for replacement parts.

NHTSA #11726747

The car would not start when start button was pressed. Warning on the dash said 12v battery critically low. This happened on three different occasions. After jump starting the car, everything works as normal. I am able to turn off and turn on again as expected. 12v battery was tested and seems to be fine. Even the OBD2 readings show battery as working correctly. There seems to be a software glitch that makes the car think that the 12v battery is low. The high voltage battery was charged to above 70 at least on all three occasions. Now I carry a external jumper battery to avoid this situation

NHTSA #11686415

When i was out driving with my little daughter, in the middle of the road, the car showed a warning of “check electric system”. The car was very slow and went into limp mode. I had to quickly park at a shoulder. Called roadside assistance, they sent a tow truck within 40 mns, the car was completley dead when they arrived. They had to send another tow truck that arrived after another 35 mns. I had to wait in the heat with my little daughter till they transferred us to the dealer , the repair for the iccu failure took 2 weeks. Now i am very scared each time i drive the car that this might happen again.

NHTSA #11670677

On 12/13 while driving back home at a red light at night, we heard a loud pop at the driver's rear side and suddenly the dash displayed a warning stating "Check electric vehicle system". The car then would not drive past 25 mph and kept flashing the warning. We got it home safe, and planned on dropping it off at the dealership the next day after jumping it. The next day however, after multiple attempts to jump the car's battery, it would not start enough to move it. The car would start and then flash a warning saying that the 12V battery voltage is low and then shut off again. It had to be towed on 12/15 to the dealership where they will be doing an diagnosis.

NHTSA #11705048

My EV failed to charge using a home or public charger. The dealership determined that the ICCU of my Ioniq 5 failed and replaced it under warranty. I previously had evey software update and recall related to the ICCU performed, yet it still failed.

NHTSA #11701955

Hyundai model Ioniq 5 (all years and trim styles) have a known issue with ICCUs (Integrated Charging Control Unit) that fail. This component controls charging of the 12 volt battery, and in turn electrical systems. Hyundai replaced my ICCU, but I am concerned it may fail again, as the underlying issue does not seem to be known or addressed. When the ICCU fails, the vehicle can suddenly lose the ability to move. This can be extremely dangerous if the car is in motion and unable to safely pull over. Luckily, my ICCU failed in the middle of a parking lot. Many Ioniq 5 owners report this issue, some multiple times on multiple ICCUs.

NHTSA #11712391

I bought this ioniq 5 pre-owned at 10,000 miles on 6/21/25. Clean carfax and no active recalls. One mile off the lot the system I received the message "12V battery voltage low. Stop safely." The car completely turned off. Could not put it in neutral. I was stranded on the road and it could have caused an accident. I got it towed near an auto shop and bought a new battery, thinking it was just a dead 12V battery. The car turned on and seemed to resolved the issue, but after 20 minutes of driving, it completely turned off again on the road. Very dangerous. I dropped it off at Platinum Hyundai of Tracy dealership and am awaiting a diagnostic.

NHTSA #11668936

The car lost its ability to accelerate during rush hour on a very busy interstate while I was in the far left lane. It started by jerking really hard off and on, like a very hard brake for a second, and then normal for a few seconds, and then hard braking again. I could accelerate after the "braking". There were no warnings or errors. This continued for about a minute while I was trying to decide if it was triggered by accelerating or braking, and I couldn't figure it out. At that point, I couldn't accelerate and received a number of lights and a message to check the EV system or the electrical system. I don't remember because at that point I was trying to immediately figure out how to pull over and not get hit. Luckily, it was slow enough and traffic had just thinned out enough, having passed a popular exit, so that I could coast to the shoulder across all of the traffic. I noticed at this point that the car was in neutral. I couldn't shift into drive, however. I tried to see if turning it off and back on might help. It did at that point. There were no error messages, and I could shift into drive and drive normally after turning it off and back on. Again, I wasn't concerned with documenting an error message that I assumed would be stored. The car is available for inspection. The safety of myself and my kids and other drivers around me was at risk as we could not accelerate and I was in the far left lane to the right of an express lane and left of a lot of traffic to have to cross to get out of traffic. No, the problem has not been reproduced, and it was taken in the next morning to the dealer who found nothing wrong and no stored error codes. No lamps or messages appeared before the loss of acceleration and promptly disappeared after restarting the car. Nothing was stored for the dealer to retrieve, either. The dealer ran diagnostics and found nothing wrong.

NHTSA #11661862

Code P1A9096 Iccu and fuse. The car is currently at a dealer in Barre, VT. While driving numerous warning lights appeared lowering my speed to 10 MPH immediately leaving me vulnerable to a collision in moving traffic. Warning lights include "Check Vehicle Electric System", "Power Limited". Issue confirmed at dealer.

NHTSA #11660750

The ICCU on my Ioniq 5 failed about a year after getting the software update that supposedly addressed the issue. I am very concerned about the reliability of my car going forward as it doesn't appear Hyundai has addressed the issue and I have no reason to think the replacement ICCU component won't fail as well.

NHTSA #11725456

My vehicle displayed a Check Electrical System failure warning and experienced a complete loss of electrical power. Since it is an electric car, the car would no longer run. No light including emergencies lights worked. This happened to me in my driveway. But it happens to other owners driving down the freeway and they suddently have to pull over. Hyundai advised me to have the car towed to the dealership service center where they diagnosed an ICCU failure. This has been happening to to 2-5% of Kia and Hyundai electric cars. I was told the ICCU was on extreme backorder. I waited ~6 weeks for my car to be repaired. Note that there were two recalls for the ICCU unit previously and I performed those recalls promptly. There were no other warnings at all before the Check Electrical Systems error and sudden loss of power.

NHTSA #11667022

We had the Internal Charge Control Unit replaced due to a warranty recall a couple years ago and it failed again on Dec. 23, 2025. The car has been at the dealer ever since, waiting for a replacement ICCU. The car refuses to charge and the dealer has diagnosed the issue as a faulty ICCU. There were no warnings or problem indicators prior to failure. This is our only vehicle, so while there was no safety issue, there is definitely a convenience issue. We had to obtain a loaner.

NHTSA #11718526