Hyundai Ioniq 5 N

Integrated Charging Control Unit (ICCU) failed while driving. Heard a pop from below the rear seats. Check vehicle electrical system message popped up initially, then changed to Stop vehicle and check power supply Vehicle could not exceed 20mph directly after failure, then lost all driving power just as I pulled the vehicle off the road. If I hadn't found a place to pull over in time, the car would have stopped in the middle of the road putting my safety and the safety of others at risk. …

Car's ICCU blew as I was pulling out of my driveway. Was able to limp to the dealer. They replaced the ICCU in a week.

Driving under normal conditions, heard a “pop” near the rear of the car and within seconds had an immediate loss of power. The dashboard had lit up with “Check electric vehicle system” and was limited to 20 MPH on a 45 MPH road with no safe place to stop. Was able to limp car home, dealer confirmed ICCU was faulty and had to be replaced. My family was very very lucky to not be on a highway when this occurred. Hyundai has continuously failed to not only fix the ICCU issues with this vehicle, but…

I have experienced two high voltage battery failures both requiring hv battery replacement. The first occurred around 6000 miles and the second occurred around 13,000 miles. I also had several dead 12v battery episodes where the card would be dead; even when plugged into the home charger overnight. I had to replace the 12v battery at 12000 miles.

ICCU failure and fuse, the car became unoperational and needed to stop. The car would no longer charge the 12V battery, and the EV battery would not charge. Hybrid Control Problem Detected at 3,160 miles. DTC P056216

What happened to me is a common problem with these models. I had an issue with the 12 V battery not being charged by the main battery as it should be. This led to a blowing of the main fuse which took out the ICCU unit. This seems to be fairly prevalent from what I can tell from online forums, and there needs to be a recall from Hyundai.

The contact owns a 2025 Hyundai Ioniq 5 N. The contact stated that while driving at 40 MPH, the service battery immediate warning light illuminated. A dealer was contacted. The vehicle was taken to the dealer because the ICCU unit needed to be replaced. The vehicle was not repaired. The manufacturer was not notified of the failure. The approximate failure mileage was 8,000.

While driving home, I experienced a sudden and complete power system failure in my Hyundai Ioniq 5 N. The failure occurred shortly after starting the drive, and was preceded by a faint pop sound. Within moments, the dashboard displayed the following critical warnings: Red 12V battery icon Red warning: Stop vehicle and check power supply Turtle icon (indicating limp mode / low power) Brake warning light ⚠️ The vehicle immediately entered limp mode, then fully lost power within approximately 3…

The contact owns a 2025 Hyundai Ioniq 5 N. The contact stated that while driving and exceeding 30 MPH on several occasions, the accelerator pedal was released; however, the vehicle accelerated unintendedly for three seconds. Additionally, the contact stated that upon depressing the brake pedal, the vehicle responded as intended after three seconds. The vehicle was taken to an unknown dealer, where it was diagnosed and determined that the ABS module had failed, and a software update was needed.…

After recent software update on 17 March 2025, the vehicle demonstrated unpredictable high acceleration. Vehicle is unsafe in E-shift mode. Vehicle can only be driven safely in automatic mode. Per a Hyundai communication: there have been complications reported related to the Vehicle Control Unit (VCU) software that may cause momentary continued acceleration during the release of the accelerator pedal while the vehicle’s N e-shift feature is engaged, increasing the risk of a crash. Our…