2025 Hyundai Ioniq 5

While driving, I heard a popping sound from the backseat area, and immediately experienced a sudden loss of power. Warning sounds came on and a dashboard warning to check the power supply. I was able get home on back streets with a maximum speed of 23 mph before the vehicle lost all power. I had it towed to the local Hyundai dealership where they diagnosed a failed ICCU unit. As of this writing it's been two weeks and I am still waiting for the part to be replaced.

The vehicle, while driving, displayed an error to "Check vehicle electrical system" and went into a mode that wouldn't allow it to accelerate beyond ~20mph. I was lucky that I was not on the highway, or it would have extremely unsafe. Instead I was on a 45mph road and was only a moderate hazard to traffic passing me. Upon returning home, we called the dealership and were told that we couldn't take it in for 3 days but that it was safe to drive it there, approximately 9 miles. That morning, I made it less than 1 mile as the car wouldn't go above 12mph. It displayed an flashing warning to pull the car over, then the car completely shut down electronically. I was unable to shift to Park or so anything at all. So while I waited 2 hours for a tow truck, I had to stay seated pressing the break in 15 degree weather with no heat. I called the dealer to inform them that it would be towed instead of dropped off by me. I told them the error code I saw in the app, and they said it was likely an ICCU failure. Upon receipt and diagnosis, they said it was the ICCU and they would likely have it replaced by Wed 01/14/2026. After no communication, I called 6 times on 01/15/2026 before getting an answer. At this time I was told the part wouldn't arrive until between 01/17 - 01/26 and that they would call me after 01/26 if it hadn't arrived yet. They refused to offer a loaner or rental when asked, claiming that "they did not have any available". As of now I am still waiting for any further communication from the dealership.

Vehicle is approximately 8 months old, has 9390 miles on odometer. While on a road trip, we stopped to charge the vehicle at a DC fast charging site. After about 10 minutes of charging, there was a loud pop sound and the vehicle stopped charging. Attempting to unplug and replug the charger into the car gave nothing but an error. Contacting support, was told that the vehicle has an air flap problem. That is not the problem. The charge controller system (ICCU) failed during charging, leaving the vehicle without power to charge the 12V battery system, and only enough driving power to limp 1 mile to a hotel. Vehicle required towing 400 miles to get to home dealership for repairs. Hyundai reps have stated that this 2025 vehicle is not part of the ICCU failures recall, but it is obviously exhibiting the same problems. I no longer have confidence this car can be driven any significant distance from home, which ruins the functional value of the vehicle.

ICCU failure while driving. Car completely stopped. I was driving up an incline feeder street in a shopping mall with several other cars also trying to use the feeder street which led to a main street. Because everything failed and I was on an incline, I had to keep my foot on the brake at all times. My emergency flashers didn't work. I had no way to alert the cars behind me to go around. I couldn't roll back to a safe position because cars were coming up the same road in a steady stream. The dealership has confirmed that the problem was a failed ICCU, which controls all the electrical/electronics in an electric vehicle.

Have had the 2025 model for 4 months now. Absolutely love everything about it except the driver attention system. I leased this car and honestly if I can't figure out a solution there is no way I'm buying it at the end of the lease. I'm 6'1". I don't know what it is about how I have the seat/wheel situated but I get constant nags about "take a break" or "take control of the vehicle". My hands are literally at 10/2 and I'm staring into the sensor and it's still yelling at me. Today I thought the car was literally going to shut off thinking that I feel asleep or something. I also wear glasses if that has any effect on this system

Vehicle unexpectedly entered reduced-power mode while driving. Speed was limited to approximately 25 mph and vehicle displayed “STOP VEHICLE AND CHECK BATTERY” warning along with master warning light and battery warning. MyHyundai system logged an active air flap fault. Vehicle was not drivable and required flatbed tow to dealer. This created a traffic safety risk due to sudden loss of power and inability to maintain safe speed.

On [XXX] my Ioniq 5 stopped operating. It was totally dead. Could not be jumped. Car was towed to the dealership where they had replace the battery, ICCU and fuse. It took about two weeks for this to occur. The car had 3500 miles on it when this happened. Prior to the car not stopping an electrical warning light came on and the car speed was limited to 25 miles an hour but totally ran out of juice in about 10 minutes. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)