2024 Hyundai Ioniq 5

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"

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.

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.

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)

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)

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.

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.

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.