2023 HYUNDAI IONIQ 5 Complaints

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.

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.

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!

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

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".

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.

ICCU FAILED and Hyundai service states that part is back ordered indefinitely. Has been 2 weeks with no further updates Additionally service department is unable to repair forward monitoring sensors that quit working with the smallest amount of precipitation, sometimes just from road condensation.

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)

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.

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.