2023 HYUNDAI IONIQ 5 Complaints

While driving my 2023 Ioniq5 I got a warning on the dashboard about losing power and immedately the car slowed itself down to about 15 MPH, once I was able to get to a safe spot to pull over I stopped the car and it would not start again. I had it towed to the dealer and it has been a week and the ICCU is still on backorder. No idea when I will have the car back.

ICCU failure. All recalls had been performed prior to failure. Vehicle showed the following warnings: "12 volt battery low", "stop safely", "check electric vehicle system", "stop vehicle and check power supply". Replaced 12-volt battery, still showing error messages, unable to be driven, required a tow to the dealer. OBD-II scan showed error P1A9096, confirmed by dealer as an ICCU malfunction.

The car stopped being able to charge on AC level 1 and level 2, only able to charge on DC Fast. Took it to the dealership and they diagnosed an ICCU failure, rendering it undriveable. The part is under warranty but is backordered. I have already been waiting for 14 days, and they have no update for when they'll get the part in.

ICCU Unit went bad in 2025. Car totally dead. Jumped, taken to dealership, about 1 week to fix ICCU and blown fuse. A couple months later car totally dead again. Now bad battery. I am concerned about driving anywhere now. Was stranded last time it totally died. 75 year old female, should not have to pay $699 a month for iffy Ionic 5 and rent a dependable vehicle if I travel to visit friends and family.

The car had no power on Monday [XXX]. It was taken taken to Tasca Hyundai in Hartsdale NY. The service manager told me it was the ICCU and 12v battery. This had previously been repaired on 12/11/24 under recall according to Hyundai's own records. The current service manager has no idea when the part will be available, possibly not for weeks. The car has been serviced according to Hyundai's maintenance schedule and recall notices. In fact the car went for maintenance one week prior to the part failure. No recall notice for this failure has been issued INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Hyundai model Ioniq 5 (all years and trim styles) have a known issue with ICCUs (Integrated Charging Control Unit) that fail. This component controls charging of the 12 volt battery, and in turn electrical systems. Hyundai replaced my ICCU, but I am concerned it may fail again, as the underlying issue does not seem to be known or addressed. When the ICCU fails, the vehicle can suddenly lose the ability to move. This can be extremely dangerous if the car is in motion and unable to safely pull over. Luckily, my ICCU failed in the middle of a parking lot. Many Ioniq 5 owners report this issue, some multiple times on multiple ICCUs.

ICCU failed, leaving the car incapacitated and driver stranded. Car was towed to the dealership and repaired under warranty.

Vehicle experienced sudden loss of power while driving at highway speed. While driving on the interstate at highway speed in dark, snowy, high-traffic conditions, the vehicle displayed a warning about an electrical system fault and instructed me to “stop safely.” The vehicle immediately lost some propulsion and ramped down speed. We were only narrowly able to exit the highway before it would not move further. We were very lucky that no one hit us- it is extremely unsafe to drastically decrease speed on highway. Our family was in the car and it was very, very scary. We were able to use the heating system while parked for a few minutes before we lost all power completely. The vehicle was towed to a Hyundai dealership and is completely inoperable. The service manager stated the failure is consistent with a known ICCU (Integrated Charging Control Unit) failure. The dealership reports having many Ioniq vehicles with similar ICCU failures awaiting backordered parts, with no estimated repair timeline.

The contact owns a 2023 Hyundai Ioniq 5. While driving at an undisclosed speed, the vehicle shut down unexpectedly, leaving the contact stranded for several hours. A RED warning light was illuminated, indicating an electrical failure, followed by the battery warning light being illuminated, leading to the loss of power. The vehicle was towed to the nearest dealer to be diagnosed. The dealer determined that the Integrated Charging Control Unit (ICCU) needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the issue. The failure mileage was approximately 28,000.

My 2023 Hyundai Ioniq 5 suffered a sudden Integrated Charging Control Unit (ICCU) failure that put me in grave danger. As I left my workplace in the evening, I heard a “pop” sound and got the dashboard warning, “Check Electrical Vehicle System.” It was unclear what the warning meant. I had 65% charge left at that point. As I began driving, the gas pedal “stuck,” not allowing me to accelerate past 25 mph, and it felt like the car was dragging. I did not know what was happening. The “Check Electrical Vehicle System” warning returned but gave no indication of whether it was safe to drive or what to check in the electrical system. Driving very slowly, I made it out of the military base (my workplace), parked outside of a closed establishment, and called my husband. He told me to drive further up the road to a well-lit shopping area. I exited the parking lot and entered the intersection of a four-lane highway – and suddenly, when I was in the center about to turn in the direction of traffic, the car stopped and would not respond to the gas pedal. I could not accelerate and was stuck in the middle of the highway. After several frantic pushes on the gas pedal, I was able to coast downward to the shoulder and exit the vehicle. My husband and I had brought the car to the dealer in February 2025 for the December 20, 2024 ICCU recall (NHTSA Recall 24V-868, Hyundai Recall 272). The dealer merely inspected the car and updated its ICCU software. Per Hyundai guidance, it did not replace the ICCU itself. It is taking no apparent steps to do so for 2023 Ioniq 5 owners, leaving us in danger. The seriousness of this problem is compounded by the lack of adequate warning when it occurs out of the blue. The generic “Check Electrical Vehicle System” indicator on the dashboard did not indicate what precisely in the electrical system to check, how serious the issue was, or how much of the 12-volt battery power was left. Hyundai must rectify this issue before others are hurt.