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.
2025 Hyundai Ioniq 5 electrical complaints
Page 9 of 9: complaints 221 to 229 of 229, newest first, as owners wrote them.
Ioniq 5's yellow air bag wire/harness underneath driver seat has design flaw, many other owners are noticing. In my case the cables are touching the floor, it's a hazard.
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)
Since I have purchased the car it has: 1) the car has failed and stopped moving 3 separate times. It only has 290 miles on it. 1) been unable to charge on AC power (L1 and L2 chargers) 2) barely able to charge on DC chargers. 325kwh Tesla supercharger gave 9kwh.
2025 “EV Battery Electronic Coolant Pump” issue tied to U1118 error message failed at 1072 miles. Dashboard flashed warning messages and A/C cooling failed.
Additional information for previous complaint submitted with identical VIN. DTC P1AA700
The vehicle was charging to 100% and once it reached 81%, jumped to 100% and stopped charging. Two days later, the vehicle populated an error “Battery Management System”. The vehicle was checked in to a dealer and it was confirmed that there was a faulty cell, and the high voltage battery must be replaced. It was confirmed that if I were to keep driving, the battery reading could drop at any point to 5% or lower, and continue to fluctuate causing a concern for safety with potentially losing all power.
These cars still have problems keeping the 12v charged. Car was leased on Jan 19. 12v first died on Feb 15, took it to dealer where they trickle charged it. 12v died again on Feb 18, dealer replaced the 12v. The 12v died again on Mar 11 and is still at dealer service center. Case with Hyundai corporate was opened and the dealer is going back and forth with them. When car is left alone for 5 days, the 12v appears as needing a replacement, so there is something wrong with the system that keeps the 12v charged or there is some parasitic drain somewhere that is hard for the Hyundai engineers to diagnose.
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