2024 Hyundai Ioniq 5: Recalls, Complaints & California Lemon Law

I was driving and the vehicle was operating as expected in normal conditions when I heard a loud pop sound, followed by an alert on my car infotainment to pull over and inspect the 12v battery. "12 volt battery low. Stop safely" I turned the car around to drive back home. The car wouldn't go any faster than 40mph. Once parking the car back home, the car would not turn on anymore. This is congruent with what I've been reading online about other Hyundai Ioniq 5 drivers experiencing when the ICCU in the car fails, requiring Hyundai to fix it.

NHTSA #11735401

There was a failure of the ICCU (Integrated Charging Control Unit) on my Ioniq 5 that forced me to pull off the highway after my car was no longer able to accelerate past 40 or so MPH. After I pulled off the highway I was then only able to accelerate to around 15 MPH which made it difficult to find a place to safely pull off the road until the vehicle made a complete stop and I had to wait for a tow.

NHTSA #11734540

Known ICCU issue: the 12v battery died for no reason rendering the car undrivable.

NHTSA #11731284

The issue involved a failure of the 12V battery system in my Hyundai Ioniq 5, which powers essential electronics and allows the vehicle to operate. The battery suddenly lost charge while I was driving, causing the vehicle to become inoperable. The car was towed to a dealership, and the battery and related systems are available for inspection. My safety and the safety of others were put at risk because the failure occurred on the road, forcing me to pull over unexpectedly. This created a hazardous situation, especially in traffic, as it increased the risk of a collision or leaving me stranded in an unsafe area. The vehicle has been taken to a dealership for diagnosis, they had stated there is a recall on this vehicle, iccu unit failed and needs to be replaced. It has been inspected by the dealership service department, but not by police or insurance representatives. Prior to the failure, there were clear warning lights or messages indicating an issue. The problem appeared suddenly while driving, within 5 minutes the car shut down.

NHTSA #11731279

On [XXX], my 2024 Hyundai Ioniq 5 experienced a sudden and complete failure of the Integrated Charging Control Unit (ICCU). The failure rendered the vehicle inoperable without warning, requiring it to be towed to a dealership. The vehicle is currently located at AutoNation Hyundai in North Richland Hills, TX and should be available for inspection upon request. This failure created a significant safety risk. The vehicle lost functionality unexpectedly, which could have resulted in a dangerous situation if it had occurred at highway speeds, in traffic, or in an unsafe location. A sudden loss of power or inability to restart the vehicle presents a clear hazard to both the driver and others on the road. Prior to the failure, there were no clear warnings indicating an imminent critical issue. A 12V battery issue was suspected at the time of failure, and roadside assistance replaced the battery, but this did not resolve the problem. The root cause was later identified as an ICCU failure. The problem has been confirmed by an authorized Hyundai dealership (AutoNation Hyundai, North Richland Hills, TX) on April 10, 2026. The dealership determined that the ICCU requires replacement, with an estimated minimum repair timeline of four weeks due to part availability. The vehicle has been inspected by Hyundai roadside assistance and an authorized Hyundai dealer. No inspection has been conducted yet by the manufacturer directly, law enforcement, or insurance representatives. This issue appears to be consistent with widely reported ICCU failures in Hyundai Ioniq 5 vehicles, suggesting a potential systemic defect that may warrant further investigation and possible recall action. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA #11730806

My on Thursday, April 2, my 2024 Hyunda Ioniq 5 displayed the "Check Electrical System" message displayed. I had just started the car. I started to lose propulsion on a busy street [XXX] ). I managed to get the car to [XXX] and had to pull over. I had the car towed to the Luther Hyundai, [XXX] . On Monday, April 6, the dealer informed me the ICCU failed. The ICCU and a fuse were replaced. I picked up the car April 7. Although Hyundai has supposedly fixed the ICCU problem, it continues to fail, as mine did. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA #11729747

Based on all symptoms - loud pop followed by limp mode and electrical warning, and inability to charge -- iccu is busted.

NHTSA #11727611

I was driving at 25 mph when I heard a loud pop come from the rear of the car and subsequent warning message came up on the dashboard - "STOP VEHICLE AND CHECK POWER SUPPLY". In an electric vehicle this is a very alarming message to see. I was fortunate to be close to home so I was able to drive home and call roadside assistance for my car to be towed to the dealer. The vehicle has since been diagnosed with an "ICCU" failure. I had no indication or warning that this was going to happen, just a sudden failure.

NHTSA #11727361

I was driving in a parking lot and heard a “pop” sound like a balloon breaking. The Ionic 5 lurched and stopped. A red circle appeared on the dash and said “check electrical system.” I slowly maneuvered the car into a parking spot because there was very little power and turned off the car. I called the Hyundai dealer and they told me to have the car towed to the dealer in Palm Springs, CA. When the tow truck unloaded the Ionic 5 at the dealer, I attempted to move the car into a parking spot so it was out of the traffic lane. I started the car again it again lurched and a yellow circle came up with a turtle icon. Then another red circle appeared “check 12V battery”. The car would not move after that. I went into the Hyundai service department and talked to the service representative. He said he would take the vehicle in for service and I signed the paperwork.

NHTSA #11726091

ICCU and its fuse blew randomly while reversing out of a parking spot. A warning light appeared on the dashboard saying "check electric vehicle system" after a loud pop noise came from the rear passenger side. The ICCU charges the 12V battery on board, and when the 12V dies the whole car dies, resulting in the car shutting down suddenly. It's a known issue with this model car. The service center confirmed the ICCU blew when they ran diagnostics.

NHTSA #11727506

ICCU failure while driving.

NHTSA #11725950

ICCU Failure. Vehicle underwent deal TSB for ICCU failure resolution prior to still failing months later.

NHTSA #11725581

Car was acting normally. Suddenly, the car would not accelerate. I was on a small road with no place to pull over. Vehicle said to pull over check electrical system. At great risk to my life and the safety of my children, we managed to get to a safe spot before the entire vehicle shut down. We expect that this was a failed ICCU.

NHTSA #11721849

No detailed narrative reported.

NHTSA #11725713

12v battery died at 13,484 miles

NHTSA #11720419

Car suddenly out of the blue reported electrical system problem and battery problem. It also entered turtle mode where it would not go more than 10 MPH. If accelerating across an intersection this would have been extremely problematic if expecting to be able to travel faster than that. Towed to dealer that said it is a failed ICCU. This is a common failure mode and there needs to be a fix and safety recall for this.

NHTSA #11721033

a warning "Stop immediately! Check Power Source" with loud beeping occurred and we were able to pull over and park safely. However, we were a 30 minute drive from home and in a downtown urban area. Took the next day off of work (essential healthcare worker at a hospital) to have car towed to dealership. ICCU failure. Told it could take months for replacement part to be shipped. Given a loaner car. Concerned that Hyundai does not have a real solution for this problem and that I cannot ever drive the car far from home again without risking the same thing happening again.

NHTSA #11720432

Received “check electrical system” warning when turning on vehicle. Car towed to service department. Diagnostic said it was an ICCU failure with a back ordered part and no clear timeframe on when it would be in stock and fixed.

NHTSA #11720826

ICCU failure. Dealer advises 2 month wait for replacement parts. No loaner car available. Vehicle has 15 K miles. This is a big problem with this vehicle.

NHTSA #11719525

Vehicle Details: 2024 Hyundai Ioniq (leased from McGovern Hyundai, Wilmington) Recall Services Notes: ICCU S/W,DTC CHK,&FUSE/REP([XXX]) • 272 Mileage: 10,714 mi Owner: [XXX] What Happened ([XXX]): My Ioniq suddenly died in the center lane on [XXX] near CVS Market, Burlington MA This created a dangerous nighttime traffic jam, The dashboard showed "12V battery voltage low. Stop safely" - the exact same issue fixed last year under recall. Key Details from McGovern Hyundai, Advisor said"100 emergencies waiting" - yet they're still actively selling new cars without capacity to service them? The 2024 car (within warranty) has been in the workshop for past 1 month. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA #11723195

ICCU failure happened for the second time. Car stopped randomly with no Power. Very dangerous, this is a known issue for years now and Hyundai is not doing anything about it.

NHTSA #11725056

Sudden ICCU failure in 2024 Ioniq 5 electric vehicle . A warning message to check electrical system appeared suddenly on driver dash screen. Tried to drive vehicle off street to a safe place to park. Vehicle shuttered and shook and would only move under 5mph on busy shopping & hospital area of 45 MPH road, placing me and my [XXX] child in danger of being hit by another fast moving car. Vehicle was towed to Bob King Hyundai in Winston Salem. They diagnosed the problem as a failed ICCU. Ongoing and long term problem with Hyundai. Service department has had my car for 11 days so far. They update me frequently. The part has been ordered but there is not ETA. Also, there is no guarantee that the new part will not fail as well. This puts my family at risk every time we drive the car, especially on busy roads and interstates. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA #11718881

My vehicle is 1 year old and has 7800 miles on it. I was driving on Friday evening (it was dark) and the vehicle acceleration was greatly reduced. I was about to get onto the highway but the warning light came on that said to have the electrical system checked. I pulled over and got a power limited warning and the vehicle would not drive after that and had to be towed. My toddler was in the car and if this had happened while we were on the highway in the dark I would have had trouble getting off the highway safely. The dealership inspected the car and said the Integrated Charging Control Unit (ICCU) had failed. They stated that there were 16 other cars were on the lot that had to be towed in with the same problem and that the part has been backordered since the beginning of January. I feel Hyundai is underreporting this issue and a recall investigation should be opened. There was no warning of this issue, I had been charging the vehicle and using it normally.

NHTSA #11717102

Had ICCU replaced twice last year, then today my electrical system shut off and warning lights came on that I can’t go over 10mph then after that the car shut off completely.

NHTSA #11715701

Battery light came on and car stopped after about 1 miles in the middle of the road. ICCU failure was the cause as determined at the dealer.

NHTSA #11715709

No detailed narrative reported.

NHTSA #11718658

The 12v battery system failed in November 2025. Battery was replaced by dealer. Then on February 2, 2026 the ICCU failed while driving. Complete and unsafe loss of power while driving.

NHTSA #11715282

ICCU needs to be replaced and is faulty.I had a warning on Friday and was able to jump my car, then a complete engine failure Sunday 2.1. The part is on back order, replacedment estimate not given (internet research says 1 week to 3 months) and I am in line for a loaner car even thought all parts are under warranty. The car is less than 2 years old and has less than 24k miles.

NHTSA #11715144

ICCU Failure Car was in limp mode and unable to drive during -5 degree temperatures. ICCU Failure Confirmed by Hyundai dealership. Hasnt been inspected by others No prior warnings before the issue happened

NHTSA #11714937

The ICCU failed while I was merging onto the highway to take my 15 month old daughter to daycare. I received a warning message “Stop vehicle and check power supply” and the car entered “limp mode” slowing down considerably in the middle of traffic. A turtle icon also appeared on the screen to tell me the vehicle could only move slowly. I was able to pull off into a parking lot. The car battery died. It was 10 degrees F outside. Hyundai towed it to the dealer where they confirmed ICCU failure. The recall software update took place in December 2025. The dealer doesn’t expect to have ICCU replacement parts in stock for 1-2 months due to back order and 10 other ioniq5s are there waiting for the same fix. The vehicle is likely available for inspection by NHTSA if the dealer service center allows access.

NHTSA #11714434

ICCU failure, which made the car stop dead in the road with no way to move it because the car shifts into Park when powered down (there is no way to shift into Neutral without power).

NHTSA #11719807

- What component or system failed or malfunctioned, and is it available for inspection upon request? The ICCU failed. It is not available for inspection. - How was your safety or the safety of others put at risk? Minimally. The car alerted me that it was power-limited and that I should stop the car immediate and get it towed to the dealer. - Has the problem been reproduced or confirmed by a dealer or independent service center? Yes. - Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? Yes, the dealer. - Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? Yes. The car informed me it was power limited when I started it. When I started driving after about a mile I was instructed to pull over get a tow.

NHTSA #11721169

I charged my car overnight and in the morning the ICCU failed, confirmed by Hyundai dealer. No prior warning.

NHTSA #11714616

The ICCU (integrated charging control unit) failed on Friday 1/23/26 as I was driving home. Two warnings came on, check electrical system and stop vehicle, car went into limp mode and was later towed to dealership where ICCU failure was diagnosed. Part is backordered, no ETA available for replacement. No loaner vehicles available.

NHTSA #11714239

ICCU failure. Put vehicle in gear and heard a pop from the back. Dash said something about check vehicle soon. approximately 5 minutes later chimes went off and dash said another electrical warning that sounded more serious. Towed to dealership. Said ICCU was bad

NHTSA #11720487

The ICCU and fuse failed, rendering the vehicle unusable and stranding my wife and child. The problem has been confirmed by the dealer. The component was inspected and confirmed to have failed. There were no warnings or indications of any kind prior to failure. My wife heard a pop from the back of the vehicle, then all sorts of warning lights lit up and the vehicle stopped.

NHTSA #11720475

Our 2024 Hyundai Ioniq 5 suddenly lost propulsion after briefly showing a warning that the 12V battery was malfunctioning. Fortunately, this happened close to our home on a road with little traffic. We could make it home at very slow speed (15mph) and the car completely shut off on our driveway and became unresponsive. The vehicle was towed to our Hyundai dealer by Hyundai roadside assistance service. The mechanic at the Hyundai dealer (Sport Durst Hyundai, Durham, NC) informed us that the Integrated Charging Control Unit (ICCU) had failed and did not charge the 12V battery. After researching I learned there had been a recall on the ICCU for model years 2021-24. However, when entering our car's VIN into the Hyundai recall site, and also in the NHTSA recall site, we found that our car was not included in the recall. Still, the ICCU failed. If we had driven on a freeway the sudden loss of propulsion could have caused a catastrophic collision. I also read that even after ICCU replacement due to recall, some replaced ICCUs failed again. I am very concerned about the safety of the car, even after repair. The mechanic advised us that it may take more than a week for the ICCU to arrive for replacement.

NHTSA #11712319

Initial alert “stop vehicle, and check power supply“. We were on I5 when limp mode triggered. This was dangerous as the speed of traffic was 75. Car was towed and dealer determined it was the ICCU. Car has been in the shop for almost 3 weeks. Still no estimate on the replacement part.

NHTSA #11716081

Electrical system failure. A electrical warning message appeared and the car immediately shutoff and slowed down. I was forced to stop on the side of the highway with limited shoulder. The car is currently at a hyundai service center and confirmed to be an ICCU issue. Even after adressing recalls, this issue persists.

NHTSA #11716142

ICCU unit died while driving. Very sudden - I got a message on dashboard to check the electrical system (and how am I supposed to do that on my own while driving?). Within a few minutes system tells me power was reduced (I had 85% charge), within a minute or so after that system starts telling me to pull over. Happened in town so I got to a paring lot and called service -- but the speed and cryptic nature kind of set me aback.

NHTSA #11712096

We purchased the car less than a year ago. It is still under warranty. The ICCU failed while we were driving on a city street. Several warnings lit up on the screen, telling us to immediately pull over for safety because of an electrical failure. We waited 30m for a tow truck in below freezing weather. It was towed to the Hyundai dealership, and several days later they inspected it and confirmed it was a failure of the ICCU (a known problem with this make and model). Replacement parts are on indefinite backorder - so we have no idea when the car will be repaired and returned to us.

NHTSA #11713084

ICCU failure. Occurred within the first few hundred feet after starting a drive.

NHTSA #11720051

ICCU Failure & Main Fuse Broken

NHTSA #11733499

The vehicle flashed a warning and suddenly lost power, forcing me to pull over or be stuck in the middle of the road. The vehicle could no longer be driven, as this problem occurred quickly after subsequent restarts. I had the vehicle towed to the dealership, who confirmed it was a broken ICCU, and stated that this had been happening a lot to the Ioniq5s. The replacement part was on backorder. It ended up taking nearly 60 days for the replacement to arrive and to be installed.

NHTSA #11738598

The vehicle began giving me electrical error warning messages at startup. I tried to drive it but further warning messages advised to stop driving. I ended up having Hyundai roadside assistance come and tow it to a dealer. The dealer reported the ICCU unit failed. The only remedy was replacing the whole unit which they could only get from Korea. It's been a month and there's still no ETA for the part.

NHTSA #11717064

ICCU failure (as determined by the dealership), car lost power rapidly while driving (there was a 'check electrical system' error on the dash) and I had to push the vehicle to clear it from the road (there was no shoulder where it failed).

NHTSA #11715632

The car displayed electrical system warning messages while driving, and it would no longer drive above about 25 mph. The issue was diagnosed as an ICCU failure by the dealership and has been awaiting a backordered ICCU for about 5 weeks.

NHTSA #11718512

No detailed narrative reported.

NHTSA #11720479

While driving 45mph car started flashing “electrical system failure pull over now” was able to pull over without accident but was terrifying and dangerous. We’d just had the ICCU recalled and replaced this summer. We had no issues before and bought the car Jan 31 2024.

NHTSA #11716871

ICCU (Integrated Charging Control Unit) failure. The car had been working perfectly up until the failure and had about 70% charge on the main battery. As I started driving, I received a warning to check the electrical system but not really providing instructions on what to check. Car was not able to exceed 25 mph, then 15 mph and subsequently was completely dead after parking without ability to even lock doors. Car was towed to a Hyundai dealer, who confirmed that the problem was due to the ICCU unit breaking, which I am now waiting to have replaced since the part is on backorder. Due to ICCU failure, the power was coming from the 12V battery, which quickly drained. ICCU software patch had been applied previously under a recall, but the ICCU still failed. It does not seem that Hyundai has fixed the problem, and there are many other reports of this happening to other Hyundai/Kia owners with EVs using the E-GMP platform similar to the Ioniq 5. Even after getting ICCU replaced, some owners have reported the ICCU failing again. Please require Hyundai/Kia to fix this problem permanently as the situation could have been very unsafe for me had this happened on the freeway or some place I could not pull over.

NHTSA #11711539

On 1/8/26, while driving in morning rush hour traffic on a busy expressway, a loud bang was heard under the car and the car suddenly lost power/propulsion. A warning light for low power displayed on the dash at the same time. Fortunately, I was able to drift to the right shoulder as much of the traffic was exiting the expressway just behind me. Otherwise, this could have caused a collision. Since the car lost all power, I wasn’t even able to engage the hazards while awaiting assistance. Car was towed to dealer who confirmed an ICCU failure, which appears to be a well known issue with this vehicle. The fact that there was NO warning and the car’s sudden loss of power on a busy highway, AND I was never contacted by the dealer/manufacturer about any recall for this problem has me very concerned. I also understand this could happen again despite the repair (which took 4 weeks due to part on back order).

NHTSA #11716382

My car (a 2024 Ioniq, which I bought new exactly a year ago, and which has less than 12,000 miles on it) lost power on a busy road. I ended up having to get it towed to the dealership as it was not drivable. It’s currently at the dealership with a blown ICCU, which I’m told needs to be replaced. Apparently this part is on back order due to high demand & I do not have access to my vehicle for at least 2 weeks. Upon doing research, it seems that this is an extremely common problem for the Hyundai Ioniq. NHTSA has the ICCU failure rate as 1% but per my dealership, in their experience, it is 6-7%, which is appallingly high. I am very surprised and disappointed to see that there has been no recall ordered for this part.

NHTSA #11709796

The integrated central control unit failed on my Hyundai Ioniq 5. A warning flashed on my dashboard stating that the car needed to be turned off immediately because of a power issue. I was in traffic on a very busy road and was trying to navigate to a safe place when my car stopped and turned off. After several attempts, I was able to start it enough to get off the street and to a safe place. I was fortunate that I was stopped in traffic or someone may have hit me. The tow truck driver said that he is towing at least one or two 2024 or 2025 Hyundai Ioniq 5 vehicles every day for this issue. The Hyundai service center said the ICCU failed and do not have an estimated date for replacing it because of the number of ICCU units that are failing is so high and they are backordered. I do not feel that this car is safe to drive. These cars should be recalled. If I had been driving on a freeway, I could have been hit and killed because I would not have had time to find a safe place to stop.

NHTSA #11711228

While the car was being driven, total failure. Towed to dealership. Diagnosed as ICCU failure.

NHTSA #11714665

The ICCU failed as confirmed by local Hyundai dealership. That was on Jan 4. Car taken to dealership on Jan 5th 4 weeks later on Feb 1 still awaiting part (ICCU) which is on national back order as per the dealer and Hyundai customer support.

NHTSA #11714746

Jan 2, 2026. Vehicle made a popping sound and threw an error message. Took it to the dealer. Dealer diagnosed it with failed ICCU (integrated charge control unit?). Said that they had recently gotten 8 more failed units. Said that there are no more parts in stock in the US and Hyundai must manufacture and ship more. ETA is March but they are not sure. I do not believe Hyundai’s assertion that this only affect 2% of their EVs if they cannot keep parts in stock.

NHTSA #11713480

I was driving the car on the morning of January 1, 2026 and on its own with no warning it slowed down to 22 miles per hour on a street with 40 miles per hour. Cars angrily began speeding around me, and I could not make the car speed up beyond 22 miles per hour. I turned down another street and a message in the car said something to the effect of to check power source and pull over. I turned the car off and restarted but it the problem continued. I was able to make it home, and the car then went completely dead. I had it towed thereafter to the Hyundai dealer and they eventually told me the ICCU was broken and would need a new one (but they cannot say when even after weeks). I now see that many others have had this same problem for some time. I was not warned that this could happen (and would not have leased the car had I been told). It is dangerous to have the car throttle down especially to not be warned ahead, and I am glad I was not on a freeway and made it safely home. The dealer said this is happening to others, and that there are no replacement ICCUs in the United States. From the internet (I cannot verify) others said they waited months and got the same part which has failed for many, sometimes again after replacement. I only know what happened to my car and consider this dangerous.

NHTSA #11712447

On December 28, 2025, the vehicle displayed the dashboard warning "Check electric vehicle system." It was brought to the dealership and has been sitting there for 24 days so far due to a drained 12v battery and failed ICCU system. The dealers informs me that the ICCU is on a "national freeze, meaning that the part is on standby for further review by Hyundai engineers. The safety of everyone in the vehicle was at risk because the electrical system could have powered down in traffic without warning.

NHTSA #11712718

Almost immediately after shifting into reverse in my garage, I heard a loud pop come from the back seat. The car began to flash warnings on the dash about the electrical system, which turned to an emergency error after about a minute. I ended up having the car towed to the dealer, who confirmed the ICCU blew. I had not had the car on a charger in over 2 weeks and it is only charged on a level 1 charger in my garage. It has now been 2 weeks since the dealer received my car and are claiming that the part is still on back order.

NHTSA #11710300

all suddenly car started to show : Check electric vehicle system" And slow down to 25 miles and eventually 10 miles. Make it not drivable. Looks like ICCU issues

NHTSA #11708195

I am writing to formally document a serious and ongoing safety concern with my 2024 Hyundai Ioniq 5 SEL RWD Long Range Vehicle Information • Vehicle: 2024 Hyundai Ioniq 5 SEL RWD Long Range • VIN: [XXX] • Purchase Date: January 2024 • Purchase Price: $44,139.80 Summary of Events • May 2, 2024 – Recall performed: DTC CHK ICCU FUSE RPL24-01-0234 at Casa Hyundai Las Cruces • March–April 2025 – Repeated 12V battery failures. After two visits to Casa Hyundai Las Cruces, I was told an app on my phone (El Paso Electric charging discount app) was “checking in” too frequently. I deleted the app, and the issue temporarily subsided. • December 20, 2025 – Vehicle would not start after sitting for approximately one hour. Required a jump start from USAA. • December [XXX] – Vehicle would not start again; service appointment scheduled. • December [XXX] – Vehicle was jump-started and driven toward Findlay Hyundai St. George. While driving on the highway, the vehicle suddenly lost power. I was able to pull off the freeway, but this was an extremely frightening and dangerous situation. I was fortunate that my husband was following me. The vehicle had to be towed to the dealership. As of now, still waiting on parts (ICCU replacement) with no date given on backorder. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA #11710666

ICCU failed. Confirmed by dealer diagnostic.

NHTSA #11711809

I was driving and emergency lights went on declaring no more energy to the car despite being at 68% charge. I was able to pull the car off the road. A tow to the Hyundai dealership revealed it was an ICCU failure. I had done the ICCU recall. It was towed to the dealer on 12/21/2025 and the car was fixed on 1/12/2026 (they needed to wait for the new ICCU unit to arrive).

NHTSA #11711842

On Monday Dec 15 I was on the Coranado bridge in San Diego heading on the island. A warning flashed about the electric system. Then, towards the end of the bridge, the car immediately slowed down suddenly and I could feel the regenerative breaking. I had to time or opportunity to get over. By the grace of God, traffic started to slow as we got near the end of the bridge and the car was able to go roughly 20 MPH on the side roads with my foot all the way down on the accelerator pedal. With my hazard lights on, I was able to drive closer to where I was meeting my wife and find a parking lot to turn into so a tow truck could get me. It was terrifying. I’m alive by some miracle and I’m very lucky I was meeting my family and they weren’t with me.

NHTSA #11705812

On November 21, 2025, while driving at approximately 60 mph and with approximately 15,685 miles on the vehicle, my 2024 Hyundai Ioniq 5 suddenly experienced a loss of automated systems including adaptive cruise control, lane keeping assist, and forward sensors. The failure occurred without warning. The following day, the 12V battery was completely dead and the vehicle required a jump start to operate. The vehicle was diagnosed with a failed ICCU (Integrated Charging Control Unit). The ICCU was replaced by the dealership on January 6, 2026, under warranty. There were no crashes or injuries as a result of this incident. The sudden loss of driver assistance systems at highway speed poses a significant safety risk, as drivers may be relying on these features and have no warning before they cut out.

NHTSA #11720233

While driving, heard a pop sounds from back seats. Then a warning appears on front screen : Check Electric Vehicle system. The car lost all power and stopped beside the road. The car has only 14K kms on it.

NHTSA #11699016

No detailed narrative reported.

NHTSA #11698601

Potential Failure of Integrated Safety Systems: On modern vehicles, the telematics/infotainment unit is often integrated with other vehicle systems. This failure raises concerns about the reliability of connected safety features, such as automatic crash notification through the Bluelink system, stolen vehicle tracking, and emergency service button functionality. I cannot verify if these critical safety systems are operational, which compromises my sense of security and the vehicle's intended safety package. Remote Start Failure as an Environmental Safety Issue: While remote start is a convenience feature, its failure in extreme weather conditions (extreme heat or cold) forces me to enter an unsafe vehicle environment. In cold climates, this means driving with frosted windows and a cold, stiff cabin, impairing visibility and driver reaction time. In hot climates, it can lead to dangerously high interior temperatures before driving. A feature sold with the vehicle to mitigate these risks is inoperative. Uncertainty and System Integrity: The root cause of this total system failure is unknown, as Hyundai Motors has provided no diagnosis. This uncertainty about the stability of a core electronic control unit is, in itself, a safety concern, as it may indicate broader electrical or software vulnerabilities that could affect other vehicle functions. I first reported this issue to Hyundai on October 29, 2025, ticket number [XXX]. Despite multiple inquiries, I have received no substantive update, no diagnosis, and no estimated timeline for repair. The manufacturer has effectively stated they do not know what is wrong with my vehicle or how to fix it. This is an unacceptable failure to uphold the vehicle's warranty and address what I believe to be a safety-related defect. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA #11711150

The ICCU failed at approximately 14,000 miles. I was driving on a residential street and was able to park on the side of the road, so there was no danger, but the car became undriveable

NHTSA #11720569

Pop sound while driving. Lost ability to drive at normal speed. Was able to take car to repair shop and was informed of ICCU failure

NHTSA #11725754

The car was down to 16% charge on the battery so I put it on the 220 v charger at my house. The next day I went to leave and removed the charger from the car and started it. I heard a pop and thought the garbage truck doing weekly pickup had run over something but now I think it was a noise from the failed component. Got in the car and started it and saw a yellow circle with the words “check electrical system”; I had seen this error message once before following a software update to the ICCU back in September 2024 [turned the car off and back on and the error went away] so I did the same thing again but the error didn’t go away instead the circle warning on the screen went to a red circle and read “stop the car and check the electrical system”. Went inside the house and called the closest Hyundai dealership [in Longmont since the one in Boulder closed with no warning] and after some back and forth they told me to have the car towed in since the 12 v battery charging system wasn’t working and it controls many things like power steering and regeneration braking and can cause a loss of power making the car undriveable and unsafe. Towed the car in and got a diagnosis of a failed ICCU module. The part is on order and I have no idea when it might actually come in and get installed. Hyundai is aware of problems with the ICCU and 12 v charging system and has issued several software recalls; this ICCU problem is all over the Hyundai Ioniq 5 forums and is a widespread issue with the Ioniq 5. I’m lucky this failure occurred at my home versus when I was driving or many miles away or at night cuz I would have been stranded.

NHTSA #11677477

I was driving on a highway during traffic on June 17 2025 and my ioniq 5 car started to make weird sound. Then after a minute, it abruptly started to push back and forth and the noise became stronger. A couple of minutes later, the "Check electrical vehicle system" sign was displayed on the screen. I pulled over due to the scare and turned off the car. A minute later, turned ON the car and drove. Same exact thing happened a day before too. This has not happened before since I got the car in Dec 2024. Car's battery was at 82%.

NHTSA #11667590

Iccu failure in middle of busy interstate. Pop sound and then notice of electric system failure. Only made it 1.5 miles before vehicle fully died. Extreme safety concern. Couldn’t use any electrical systems on EV

NHTSA #11719768

Routine Friday morning and just finished charging my 2024 Hyundai Ioniq 5 at Walmart. As I started my vehicle to finish my commute to work, the dreaded "Check electric vehicle system" warning light came on along with a red battery icon. There were no warning signs or anything that could have foretold what would be happening. I pulled into an empty parking stall and called the Hyundai dealer for advice. I was told not to drive the vehicle and get it towed to the dealership. After being diagnosed, my car will need a new ICCU and ICCU fuse. The dealership gave me no ETA as it often takes weeks to months to receive the parts from Korea. I was told Fontana Hyundai had 9 other cars with the same ICCU issue in line before mine. I was so glad it occurred in a parking lot and not on the freeway since a malfunction with the ICCU will basically cause the car to loose total power and control. This is definitely a huge concern and safety issue.

NHTSA #11719972

My car gave me a "Check electrical vehicle system" message, which I have seen online may mean a problem with the ICCU. As the dealership is close - about five miles from my home, on residential roads - I decided to drive there. The car lost power very quickly and then died in the road shortly after leaving my driveway. Thankfully I wasn't on a busy street or an intersection and was able to safely get it to the side of the road, but if it had died while driving at a higher speed it would have been very dangerous.

NHTSA #11718794

“Check EV System” error appeared in a red circle, with a red 12v battery icon. Then a turtle icon appeared and the car would not exceed about 30 mph. I was able to drive a mile and park in a lot. This happened after Level 2 charging to 100% and then driving one mile in 25° weather. The car was towed to the dealer.

NHTSA #11717943

While pulling into traffic the car lost power and went into limp mode risking a collision. Car was immediately backed into driveway and completely died shortly after the initial power loss and had to be towed to dealer. Dealer diagnosed an ICCU failure. Warning lights activated at the moment the car lost power. Had this occurred on a highway or in heavier traffic the power loss and speed with which the car went from fully operational to dead could have had catastrophic consequences.

NHTSA #11717977

On January 31st, 2026, not long after starting a journey in my car, I got a “check electrical systems” warning. I was close to home so was able to turn around and drive home. Just before pulling into the driveway, the warning changed to a “power limited” warning. On Monday Feb 2nd, I had the car towed to my local dealership, where it has been since. The dealer confirmed that it was an issue with the ICCU component which is on back order to this day.

NHTSA #11721005

At approximately 10pm on Saturday night with temps in the single digits and a large snowstorm (that would cripple much of the US for several days) just about to hit, the 1.5 year old vehicle failed completely. Propulsion battery 81% charged, started normally, then gave "check electrical system" warning which upon search can be due to a low 12v battery; call AAA and spouse (live 2hrs away). Began to drive towards a station two blocks away, thinking plugging in may help system warm and/or recharge 12v battery. Car goes into limp mode on road, then dies in four-lane road. Use portable battery jumper, draining it into the 12v battery and able to limp-mode out of traffic and into Walmart parking lot entrance where dies again. With bystander help, push the vehicle across parking lot to chargers; vehicle in total electrical failure w/random lights flashing (tail, dash, etc.) and no command-functions (couldn't shift into park, open charging port). Charged 12v battery from an ICE car 30 minutes w/restoration of command function, but nothing more than limp mode. AAA still hours ETA. Personally swap 12v battery purchased from Walmart w/restoration of power, but abnormal function (lane assist forcing wheel, menus malfunctioning) & warnings remaining. Drive vehicle to -thankfully- nearby dealership before another failure. Abandon vehicle & wait for pickup by spouse, drive last hour in a snowstorm. Very lucky I wasn't stranded on the highway, hit and killed in a snowstorm. Very lucky I wasn't hit and killed in the road where it died. Very lucky I called for help early, wasn't stranded more than 20 minutes in dangerous-cold, didn't wreck in snowstorm getting home. Very lucky the malfunctioning systems did not steer/force me into another vehicle or pedestrian, causing injury or death. Dealership confirmed (longstanding and very well-known) failure of ICCU module that Hyundai refuses to properly address. These are unsafe vehicles, hand-grenades on a timer.

NHTSA #11717548

I was driving on a residential street, traveling about 25 miles per hour. I heard a loud popping sound from the back of the car and within seconds I started to lose power. I pulled over to the side of the road and my car was dead. No electrical system, I couldn't even power the locks. I waited for several hours to have it towed to the dealer where it sat for 29 days waiting for the part. It's the ICCU that failed. Had I been going at highway speeds, I very likely could have been in a life threatening accident. This is unacceptable for a car.

NHTSA #11720167

We heard a pop noise and then received low 12 volt low battery warning. The Integrated Charging Control Unit (ICCU) might be the root cause of the Hyundai Ioniq 5 electric vehicle. Car went into slow turtle mode and we could barely move the car. we pulled over and found a safe spot to park car. we had car towed to Hyundai dealership since car was not operational.

NHTSA #11712305

Car died in neighborhood with electrical issue. Later reported to be an ICCU issue. At this point car has been at dealer service for over 29 days with no date on when it will be repaired.

NHTSA #11718515

While driving on highway, there’s loud pop came from rear area and then the “check electrical vehicle system” warning light came on. The car wasn’t able in turtle mode.

NHTSA #11708642

Had car in for regular service. No problems reported by service department. Immediately after leaving the dealer, less than 1 mile away, a warning message came up on the screen that the car "may have experienced a charging/electrical event, and to contact my dealer immediately of service. Risk of system failure. I immediately returned to the dealer, and they did a quick diagnostic check, which revealed DTC code P0AA600. This is the second similar incident with this car. On 1/10/25 this car had recall campaign 272 performed, which was supposed to fix this problem. On 8/22/25 the car would not start and had to be towed to the dealer. They replaced the 12v battery and claimed the battery was defective.

NHTSA #11708406

I lease a 2024 Hyundai Ioniq 5 AWD. Prior to a planned trip, the vehicle displayed an electrical system warning. I contacted the dealership and was advised to bring it in. While driving approximately 5 miles to the dealership, the vehicle lost all power including hazard lights, leaving me stranded on a busy road. I contacted roadside assistance and the vehicle was towed to the dealership. The dealership confirmed the failure was caused by the ICCU (Integrated Charging Control Unit). The repair took approximately two weeks. The vehicle was unavailable during this time, requiring a rental car. Hyundai partially reimbursed rental costs but did not compensate for other losses incurred. The ICCU failure is a known widespread issue affecting the entire Hyundai/Kia E-GMP platform across multiple models and model years. A dedicated owner community tracking these failures can be found at [XXX] . The sudden and complete loss of vehicle power including safety systems such as hazard lights while in traffic represents a significant safety risk to the driver and other road users. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA #11734162

Component failure (ICCU module) lead to loss of power while driving. Vehicle required tow.

NHTSA #11711750

The ICCU on my car failed after hearing a loud pop (fuse blown) while driving on the freeway. This was an incredibly dangerous scenario in which I went from 70 mph to 25 mph, in an area with no shoulder. Hyundai is aware of the issues with the ICCU and I believe they should expand the recall to include EVERY Hyundai Ioniq 5 and 6. Interestingly, the technician at the dealership states in the summary of service that my car is subject to the recall due to the fault code (P1A9096). Why did I have to experience this failure to be subject to recall? My car should be subject to the recall/service based on VIN, but according to [XXX] it is not. Also at issue is the time it took to Hyundai's tech line to work with my dealership, and the time they are suggesting to provide replacement parts. My car was delivered via tow truck to the dealership at 11:16 AM on 12/11/2025 and I got the message regarding the diagnosis and solution to my car's issue on 12/19/2025 at 10:01 AM. It should not take 8 days to diagnose this issue, nor should it take 2 weeks for parts that are a known issue for Hyundai. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA #11706304

I have a lease on a 2024 Hyundai Icoprniq 5. There is a recall due to ICCU issues. We had this car in service but it did not fix the issue. The car is now sitting dead in my driveway and will not move. Hyundai is refusing to do anything to fix the problem.

NHTSA #11672732

Car would not turn on in the morning. Replaced 12v battery. After battery replacement, received "CHECK ELECTRICAL SYSTEM" warning message. Car was able to be driven, but could not be driven faster than 25mph. Taken to dealer where it was confirmed the car's ICCU malfunctioned and would need to be replaced.

NHTSA #11720078

ICCU went bad. Battery warning light appeared a few hours before Vehicle stopped. Vehicle was inoperable and needed to be towed.

NHTSA #11725139

On January 28th 2026, I got red warning signs on dashboard said: "Stop vehicle and check power supply" and "12V battery voltage low. Stop safely". I was still in the parking lot, so the issue did not pose any safety issue. The vehicle towed to Hyundai dealership. They confirmed and pre-approved "Replace ICCU +fuse". The part is on 1 month back order. While the dealership initially did not commit to giving me alternate transportation, I insisted and after 6 days, I was able to get a much lower class and smaller replacement vehicle (Hyundai Venue with entry level trim). My vehicle is a lease. Since I'm paying for enjoying the vehicle amenities for a limited time, and my vehicle will not be available for at least a month, I requested Hyundai to reimburse me (or let me skip) lease payments until my vehicle is usable again. So far, the company has denied my request.

NHTSA #11718124

On January 17, 2026, I was driving my Hyundai Ioniq 5, when it began to decelerate and lose power while I was pressing the accelerator pedal. The deceleration progressed. A small flashing battery icon appeared on the upper display. This icon had never been on the display before. Fortunately, I was traveling downhill and able to safely pull the car over to a stop. I turned the car off. I restarted the car with the same issue recurring. I turned the car off and called the dealer and scheduled an appointment. After about 5 minutes I restarted the car and was able to safely drive home without further incident. The dealer checked the car out and determined that nothing is wrong with it. The dealer was unable to replicate the problem. I have no confidence in continuing to drive the car safely as a loss of power could cause a serious accident. I contacted Hyundai USA customer service and a case was opened. They closed the case explaining that since the dealer found nothing wrong there is nothing they could do. Thank you.

NHTSA #11719584

Horn keeps breaking and doesn't work dealer said this is a known issue. This will be my second time replacing it when I schedule appt maybe water keeps getting inside it and ruining it? Please fix this it is a safety hazard

NHTSA #11714067

While driving, I heard a loud pop in the rear passenger side and subsequently, the dashboard showed an error to "stop vehicle and check power supply". After driving about 15 minutes, another error showed on the dashboard "12V battery voltage low. Stop safely". After coming to a stop, the vehicle completely shut off and would not turn back on. A tow truck was called and my vehicle was towed to a Hyundai dealership. The vehicle is now at the service center at a Hyundai dealership. The dealership confirmed it was an ICCU failure. While there was not a crash or any injury, the known defect from Hyundai left my wife, my [XXX] daughter, and me, stranded 60 miles away from home, in the middle of the night. Luckily we were pulled over safely and not in the middle of the highway. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA #11707961

While accelerating onto a road with cars approaching from behind, vehicle entered limp mode and was restricted to 25 MPH. I was forced to leave the roadway to avoid a collision with the vehicle behind. The street this occurred on has a speed limit of 40 MPH. The vehicle's normal acceleration was sufficient to ensure a safe gap to the approaching car, but the time it took to recognize and react to the unexpected behavior reduced this gap. The dealer diagnosed this as an ICCU failure related to safety recall 272. All prior recalls were complete at the time of the incident.

NHTSA #11704290

The ICCU failed at 11,000 miles and 11 months into the lease. When the ICCU fails, the car becomes inoperable. This was a major safety hazard since it broke down on a major US highway and I was barely able to get off to the side of the road. This seems to be affecting a large number of Ioniq 5 and Ioniq 6 models.

NHTSA #11712323

On January 1st 2026 around 11am we were traveling in rural Wisconsin when we heard a loud pop from under the back seat . This we now know from Dahl Hyundai in LaCrosse was the ICCU failing . When this happened we were in blizzard conditions and the car forced us into limp mode and reduced us from 55 mph down to 25mph in bumper to bumper traffic on a rural hwy (this was not a smooth speed transition the car performed ) We drove the vehicle back to the nearest town going 25mph as it was alerting us that we were on limited battery as this issue in short time will make the vehicle inoperable . We found a safe place to stop and did so. We called Hyundai Roadside assistance who then let us know it would be 9 minutes until we received help. This would actually take 4 more hours . They left us with a car that did not operate , produce heat in a blizzard . We eventually had family pick us up so we were safe . We still do not have the vehicle back as Hyundai America has the part (ICCU) on back order with no ETA of repair. .

NHTSA #11716852

The ICCU failed while driving. A loud pop occured then a red warning light came up asking you to stop the vehicle and check the power supply. The car went into turtle mode where I could at best drive 25 miles per hour. This car was part of a recall last year to prevent this issue, however only a software fix was performed. Luckly I was able to get the car home on a very cold day.

NHTSA #11707319

What component or system failed or malfunctioned, and is it available for inspection upon request? - It was ultimately diagnosed as an ICCU failure. The part is no longer in my possession. How was your safety or the safety of others put at risk? - Occurred on public street, fortunately a slow moving 25MPH speed limit several blocks from my workplace. I was able to limp the vehicle to a nearby parking lot and call for towing. Unfortunately, several hours later the vehicle was unable to be moved, leaving me stranded, and requiring it to be towed to local Hyundai dealership. I was ultimately without a vehicle for >1 week. Has the problem been reproduced or confirmed by a dealer or independent service center? - Yes, confirmed as ICCU failure. Additionally, my vehicle had the software update at the time that was supposed to fix / greatly decrease the rate of ICCU failures. I had no outstanding recalls on the vehicle. Vehicle was ~1 year old and had less than 12,000 miles on it. Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? - Yes, at least local Hyundai dealership mechanics Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? - Initially the error message "stop vehicle and check power supply". The next day, that message, then a yellow turtle and "Power Limited"

NHTSA #11711584

ICCU failed while driving. This resulted in the vehicle going into limp mode while driving, cause the speed to slow dramatically and rendering it unable to be driven. Luckily, this happened close to home and I was able to get a tow truck to bring it to the dealership. Otherwise I would have been stranded. This problem is know, and was repair by Hyundai but there is no true fix as of yet, which continues to put drivers at risk. At the time of the failure the warning light "check vehicle electrical system" and "power limited" came on.

NHTSA #11714015

Hyundai is ignoring the fact that many Ioniq 5 have an ICCU defect that happens without warning and can leave you stranded with a bricked car that you can’t drive. They have a software recall for it that I had performed at the dealer. This did not solve the problem because it failed yesterday and I was stranded far from home. They continue to put this same part in the 2025 model. I have a 2024. Brand new cars are having the same problem which requires the whole unit to be replaced with the same unit that can go bad. I know people who it has happened to multiple times. They need to issue a recall that replaces the entire unit with a redesigned one. Not the same exact part. Everyone of these cars is a ticking time bomb that can leave a person stranded.

NHTSA #11696880

ICCU failed after 14k miles. Car suddenly went into "turtle" mode (displayed on dash), car could only go 10 mph and my wife had to pull the car off the street asap and was a very scary experience. Dealer has confirmed the ICCU failure and given me a loaner vehicle. No eta on when the part can be fixed, just that it's current status is back order.

NHTSA #11719947