2025 HYUNDAI IONIQ 5 Complaints

ICCU failed. Car has been sitting at service center for ~4 weeks. Luckily the incident took place at home but could have been anywhere. No warning prior to failure.

The 12V system battery failed to keep a charge and the vehicle slowly reduced maximum speed until it fully died causing the car to coast to a stop on a 55MPH highway. At 9,500 miles on the odometer the ICCU has failed. The part is on backorder and my car has been in the shop for three weeks with no estimated completion date. A LOT of IONIQ 5 owners are encountering the ICCU failure.

Main battery failure, can not charge, can not drive car. Warning light(s) on dashboard. High voltage battery needs to be replaced.

The vehicle experienced a sudden failure of the Integrated Charging Control Unit (ICCU). While driving, a loud "pop" was heard, followed immediately by a "Check Electric Vehicle System" warning on the dashboard. The vehicle then entered "Limp Mode" with significantly reduced propulsion. The 12V battery became depleted, leading to a complete loss of motive power and loss of electronic safety systems, creating a hazardous situation in traffic.

When putting my car into gear a loud pop noise was heard. The car could not be driven at the point and the instrument cluster mentioned an electrical system failure. The car was towed to the dealer where they confirmed the ICCU unit needed to be replaced. It has been at the dealership since January 8th with little to no communication.

I heard a pop followed by an alarm notification stating the electrical system had an error. I had started the climate system but the car was parked.

Vehicle experienced a dashboard alert, "Check electric vehicle system." The car produced an OBD code: P1AD3(00). Upon taking it to the dealer, they determined that the EV required a new high-voltage battery.

The ICCU (Integrated Charging Control Unit) failed with DTC P1A9096 and I was driving at approximately 25-30 MPH on 01/17/2026 at approximately 5:40 pm in approximately 32 degree temperature. The car had just been disconnected from a hardwired Chargepoint Home Flex 11.5 kw 48A Level 2 home charger with a NACS connecter (so no adapters used), though the charging had mainly ended at approximately 5:24 am that same morning (after reaching the preset charging limit of 80% of battery capacity, I believe). That charging session provided 45.572 kWh of energy over approximately 4.5 hours and then the vehicle sat, still plugged in, for approximately 12 more hours until disconnected to drive it. After driving approximately 1-2 minutes on residential streets, I heard a muffled 'pop' sound behind the front seats, and the vehicle dashboard suddenly showed 'check electrical vehicle system' and 'stop vehicle and check power supply'. The vehicle suddenly had limited capabilities, including speed, and at that point gave a limited, unspecified, amount of time to get off of the road to safety. The vehicle is currently with a Hyundai dealer (Hyundai of 110 in Farmingdale, NY) who has since confirmed it was an ICCU failure. They are waiting on a new ICCU, which is on back order. The vehicle had been leased, new, in June of 2025 and after that, was driven approximately 9,506, miles (mostly highway) and never exhibited any sounds, warning lights, control issues, or any other indications that there was any problem or that there would be any sudden problem with the vehicle.

In-Cabin Camera Unit Replacement - The in- cabin camera unit needs replacement due to a communication failure with the ICC module. Technicians confirmed proper power, ground, and CAN system continuity to the module but encountered a persistent 'ROM ID check failed' error. Replacing the unit can restore proper communication and functionality of the camera system.

All of a sudden after starting the car I got a “Check Electric Vehicle” warning sign and when I called the dealership the told me do NOT drive it and tow it. The basically told me it will die on me.