2023 Hyundai Ioniq 5 engine problems

Filed Oct 12, 2026 · Electrical, Engine · MT

I was driving my vehicle and it suddenly lost all power. I had to stop in an unsafe place on the road and wait to get my car towed. I had previously been to the dealership three times to have recall and software updates done that we’re supposed to fix this issue. Apparently the ICCU to be a terrible problem.

Filed Apr 27, 2026 · Electrical, Engine · MD

Iccu failure. Vehicle stops working completely

Filed Mar 24, 2026 · Electrical, Engine · MI

Car lost charge quickly, went into limp mode while I was driving on the highway. I had to pull of the road several times and try to get it to a charging station. It barely made it after the lose of power. Charged it to 80% and it would only go up to a range of 100 miles. Took it to the dealership and they confirmed it needed a whole new main battery. ICCU had already been replaced. Had to wait over 5 months for replacement parts.

Filed Mar 5, 2026 · Electrical, Engine · IL

On Sunday, March 1, 2026, my vehicle suddenly malfunctioned while I was driving. The car abruptly lost power, would not accelerate beyond 25 miles per hour, and then completely shut down within minutes. This left me stranded on the roadside off the highway, which was both dangerous and extremely distressing. The vehicle was towed to the dealership, and it has now been four days with no updates regarding the diagnosis, repair plan, or estimated timeline. I have repeatedly attempted to get information but have received no meaningful communication. This situation is unacceptable for a relatively new vehicle and raises serious safety concerns. In addition, I rely on this vehicle daily and am currently without transportation.

Filed Mar 4, 2026 · Electrical, Engine · OR

Having the same ICCU Failure that all other Ioniq 5 owners have. On February 26th, I was heading to work when I heard a pop and car displayed warning lights saying check EV system and stop safely. Car was limped home and towed to dealer. Was told fix will take a month.

Filed Feb 20, 2026 · Electrical, Engine · WA

My car reported an error "check electric vehicle system" and would not drive over 25 mph. I had it towed to the nearest Hyundai dealership. This was after the car repeatedly killed the 12 volt battery. This is a common issue known with the ICCU.

Filed Jan 29, 2026 · Electrical, Engine · CT

The ICCU in my 2023 Ioniq 5 has failed for the second time. The 12V battery is dead and the car cannot be driven. It will be sitting at the dealership waiting for a new part for at least a month. Hyundai claims to have fixed the ICCU problem but from online reports it is clear that they have not solved this problem.

Filed Jan 28, 2026 · Engine, Fuel system · MD

While stopped at a stop light, "check electrical system" warning flashed on instrument panel without any prior warning or malfunction. I was only able to move the car about 50 feet before all power and controls failed. I was in a middle lane and was barely able to move the car out of traffic. Tow truck driver with a large jump start battery pack was able to give it enough power for me to crawl it onto their flatbed, my small lithium jumpstart pack was only enough to get the rest of its doors unlocked. Battery temperature was about 30 degrees F, state of charge 75 percent, had been driving from home less than 10 minutes, car had been sitting outside for a few days. Problem diagnosed as ICCU failure by dealer service department, now waiting on replacement part to complete repair.

Filed Jan 18, 2026 · Acceleration, Electrical · VA

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 (the federal safety agency 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.

Filed Jan 14, 2026 · Electrical, Engine · CA

ICCU failed while driving, car limited speed immediately. This was after software recall was preformed a few months prior. Car went limp mode and repairs are going to take an indefinite time.