2024 HYUNDAI IONIQ 5 Complaints

Vehicle displayed "Power limited" and slowed to a crawl, was able to drive less than a quarter mile to a safe place before it displayed "Stop vehicle and check power supply" then completely shut down. Diagnosed as ICCU failure by the Hyundai Dealer service technician, with the parts on backorder and no ETA for the 15 or so other Hyundai Ioniq 5's with the same failed ICCU waiting at the same dealership, in front of me.

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)

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.

ICCU failure: confirmed by dealership, submitting for your records - while driving the morning of 2/11/26 in Evansville, IN a warning message appeared on the dashboard stating 'Check Electric Vehicle System' followed by a rapid deceleration. Luckily there was not a vehicle behind me as they would have rear ended me. This failure occurred without warning and presented a significant safety hazard, leaving the vehicle stranded in traffic until I was able to restart it. Vehicle went in to turtle mode upon restart, would not go over 20mph at first then I stopped the car, restarted it again, it would move for 15-20 seconds before going in to turtle mode again and now it will not go over 10mph - interestingly, when I would stop and put it in reverse, the vehicle would move 10-20' and then come to a very abrupt stop as the entire vehicle shut off - had to tow the vehicle to the Hyundai dealership in Evansville Indiana where the ICCU was confirmed has having failed

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.

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.

“Check electrical system” warning while driving. Sudden loss of power and speed. “Turtle mode” icon. Limped home 2 miles at <10mph. Vehicle bricked. Towed to dealership.

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.

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.

“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.