2025 Hyundai Ioniq 5

I was driving down the highway at about 65 mph. "Electrical failure" warning showed up and the abruptly began to lose power. We were able to pull over 2 lanes to the shoulder. The car then completely shut down after about 2 minutes. I was unable to have my hazards on and 2 young children in car seats were in my vehicle. I was on a really bad part of the road and had to move two young children into another car and barely had enough power to get over. The dealer told me I just had a bad battery and they replaced it and it was fine. I called Hyundai corporate and they said "they weren't aware of any issues with the cars ICCU" it wasn't until my husband called the dealer again and had to be extremely pushy with them that they saw it was an ICCU failure. They are replacing it now.

I was driving to work on the morning of Nov. 12th, 2025 in East Greenwich RI. The car had been fully charged on my home Level 2 charger the night before. It was a chilly morning so I turned on the heated driver seat and steering wheel. Less than a mile from my house, and without any warning or prior issues, I heard a loud pop from underneath the vehicle. Immediately the car displayed an error on the dash reporting electrical system issues. The car still seemed driveable so I began to drive back home, noting that the car wouldn't exceed ~30 mph, but before I went very far at all the error changed to "Stop vehicle and check power supply." I pulled the car over on a side road and called for a tow to the nearest Hyundai service center in North Kingstown, RI. The next day the Hyundai service center reported that their diagnostics revealed that the ICCU had failed. I subsequently learned that they had been unable to drive the car even from their lot into the service bay - even with a jump charger the car wouldn't drive and they had to carry the scanner to the lot for the diagnosis. The Hyundai app reports 96% battery charge even now, which says that the 12V battery has been fully discharged, consistent with ICCU failure. The service center has not reported that the ICCU has been inspected by any other authorities other than them. The replacement part is due to arrive today, 11/15, and should be installed on Monday 11/17. This exact problem is apparently very common to Hyundai and Kia EVs, and was the subject of a recall for the 2022-24 IONIQ 5 model years.

Was driving for 12 miles, at a stop light. Light turns green, I accelerate, loud collision warning goes off and warning “battery overheated! Pull over safely and leave the vehicle”. Could not pull over safely because the car immediately ceased and locked up, car behind me nearly rear ended me and swerved to avoid. Is this another ICCU unit failure? Car towed to dealership (car has 2056 miles in it, it’s practically new) and been there for almost a month now with no repairs done and still diagnosing the problem. This car is unsafe.

The ICCU unit has failed after 10 days of driving of the brand new 2025 Ioniq 5. It gave me a warning that the battery has failed while I was waiting on a signal light, and the car started limiting my speed. The car continued to get slower and slower, then it says battery regeneration failed at one point. The fastest I could go at one point was 30 mph. It was dangerous as I need to make sure the cars behind me don't come at me. When going uphill, I was only able to drive in 20mph. The car was taken back to the dealership to get serviced. They confirmed that the ICCU unit and the fuse have failed and my car will need a replacement.

FORWARD ATTENTION WARNING When driving, the vehicle randomly and repeatedly warns the driver to pay attention to the road even when the driver is facing forward and paying attention to the road. The system will also randomly and repeatedly alarm, disable cruise control and apply the brakes even when the driver has both hands on the wheel and is facing forward. This has nearly caused crashes. Hyundai states the system is working as designed and suggested: 1. Driver is too tall for the system see my eyes. 2. Do not wear prescription glasses. 3. Do not wear sunglasses. Research has revealed hundreds and hundreds of similar complaints. Hyundai has issued a technical service bulletin 25-GI-001H stating there is nothing wrong with the vehicle and states drivers who are tall, short, wear glasses will experience this.

I was driving the car on [XXX], and I got a battery management system warning light (DTC P0B6D00). When I got home, my car wouldn't charge. I took the car to the dealership for service for this light. Without the ability to charge and battery issues, it affects the drivability of the car and the car may stop if there isn't enough charge when driving. The problem has been reproduced by the dealer, and there was an attempt to replace a part, but it caused the light to go off 3 more times. The car has been at the dealership since June 23rd, 2025 without resolution. There were no other warnings or messages prior to this failure as the car ran without any issues. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)