ICCU failure. Sudden total electrical shutdown. According to this site, there was a recall filled but NOT COMPLETE since November 2024! We are now February 2026. There has been NO warning issued to Hyundai consumers about this. When the ICCU fails, it puts consumers at risk. When it happened to me, there was no shoulder to pull onto. Because there was a snowstorm that morning, the flatbed tow truck did not come for 3 hours. My car was in the shop for 3 days. The bottom line is that the failure of communication about this defect puts consumers at risk!
2025 Hyundai Ioniq 6 electrical complaints
Page 2 of 2: complaints 11 to 22 of 22, newest first, as owners wrote them.
My leased 2025 Hyundai Ioniq 6 experienced a sudden malfunction resulting in loss of vehicle operation. The vehicle has been at the dealership with delayed diagnosis and no clear repair timeline provided. This appears to be a safety-related defect involving the electric system. I am aware of multiple reports and recent news coverage describing similar failures in Hyundai/Kia electric vehicles related to ICCU (Integrated Charging Control Unit) defects, which can cause sudden battery discharge and loss of propulsion. Media reports indicate that this defect has affected numerous vehicles and, in some cases, repairs have taken more than a month due to part availability and diagnosis delays. My vehicle experienced similar symptoms, including loss of power / inability to operate normally, and the dealer has not been able to promptly resolve the issue. This appears to be a broader safety-related defect rather than an isolated incident.
The car displayed “Check Electric Vehicle System”. The 12‑V battery stopped charging. The vehicle could not be driven very far or very fast. The car had to be towed to a Hyundai dealer.The ICCU was diagnosed as failed. The ICCU has been an ongoing issue with Hyundai EVs.
The ICCU died and the fuse on my traction battery blew. Both had to be replaced. I realized I had the problem when I started my car and it showed "Check Electric Vehicle System". When I tried driving it, I was limited to speeds below 45MPH, then eventually 25MPH, and eventually it would enter "turtle mode" and I could limp along at a couple MPH. I found the car would no longer charge the 12V accessory battery and it would no longer receive a charge from my home charger.
My car is less than a year and a half old with only about 10k miles and last night I had the ICCU failure. I already had the software update to "fix" this safety recall 272 but it obviously didn't work. I am a female with a young daughter who was almost stranded in a bad neighborhood as suddenly my car wouldn't go faster than 15 miles an hour and I looked it up and knew it would just stop suddenly at some point. I only had a quick 1 min warning when I turned on my car that said "Check Electrical Vehicle System" then switched to "Stop vehicle and check power supply". My car is now at the dealership and I was told they have to put the same type of part back in as there are no new versions of it. Which is why others have had this happen multiple times.
ICCU failure which causes a fuse to pop. Because it is an EV the car cannot be driven
Warning came on the dashboard to check electrical and stop driving which I did and started up the car again and was only able to drive another minute until the entire car lost power while trying to accelerate and I had to have an emergency pull off into a strip mall off of a busy street car was towed although the Hyundai Road assistance did not know that the dealer they towed to was not able to work on electric vehicles, and therefore had to be restored. At this time, I was told it was an ICCU issue. The part was ordered, and I am waiting to hear back from the dealership.
-ICCU failure, identified by dealer service department as the cause of catastrophic failure. -The car suffered a catastrophic failure on a 2-lane country road in Princeton NJ on [XXX] at approximately [XXX] at night in 20 degree temperatures. Every function except blinkers (temporarily functional) ceased to work. I waited in the car, without heat, for an hour before service arrived. The car could not be moved and was left in the road until 3:00 am, when the towing company I paid towed the car to my driveway a mile from the failure site. -My safety was at severe risk while I waited in the car. -Dealer replaced ICCU assembly with the same part, with the possibility of repeated failure. -Warning messages appeared somewhat over a mile before catastrophic failure. The car slowed to 11 mph. -Hyundai has known of the potential for catastrophic ICCU failure in their electric cars since 2022. I took possession of this 2025 model in March 2025. I was never informed of any recall, although it appears that a recall was issued at the end of 2024. -Hyundai has denied compensation for irresponsibly, with knowledge of the potential failure, subjecting me to a hazardous, life-threatening situation. -Anecdotally, of the 4 Ioniq owners I know, 3 have experienced ICCU failure. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
ICCU Failure
I leased the 2025 Hyundai Ioniq 6 in April of 2025, in November of 2025 the car charging time started to increase when using L3 charging stations. The normal charging time would be 15 minutes for the battery to reach 80% capacity and an additional 30 minutes for the battery to reach full capacity. After November it took 20 to 30 minutes for the battery to reach 80% capacity. On January 2, 2026, I was charging the car at a L3 station and when charging was completed the car no longer worked. The car displayed the message “Please unplug the charger to start the car.” But the car was not plugged in. I tried to trouble shoot for 20 minutes and had to call a tow truck for the car to be towed to Hyundai. The car sat at the Hyundai dealership for a week with the battery power draining from even though it was not turned on nor was it drivable due to the error message. According to the Hyundai website, there was an open recall on this car for the ICCU, and I show no record of this issue being fixed for this car prior to leasing it. The car is at the dealership still and has not been repaired.
It is the ICCU (Integrated Charging Control Unit). The car lost power while I was going up a steep hill with a car behind me. The Hyundai dealership technician stated it is the ICCU (Integrated Charging Control Unit), and according to him, "We have ordered a replacement ICCU and FUSE. No eta on special order parts." The dashboard gave me the following message with a red battery symbol: “stop vehicle and check power supply.” In researching the VIN on the HYUNDAI SAFETY RECALLS AND SERVICE CAMPAIGNS website I learned that servicing was done on November 22, 2024 addressing this issue when it had just 19 miles on it. The Closed Campaign states: Recall 272, 2022-24MY IONIQ 5 (NE EV).2023-25MY IONIQ 6 (CE EV), 24MY IONIQ 5 ROBOTAXI (NERINTEGRATED CHARING CONTROL UNIT (ICCU) SOFTWARE UPDATE, ICCU & FUSE REPLACE. If my vehicle is repaired using a replacement ICCU that is of the same design, which has contributed to numerous failures, this does not instill confidence in their solution. I request that something be done to force Hyundai to FIX THE PROBLEM by identifying what is actually causing the ICCU to fail, and come up with a real solution, rather than a bandaid that needs replacing every so often.
The ICCU had a failure and fuse also blew; vehicle needs those parts replaced. After reading about ICCU recalls, my vehicle was not in the last recall. It affected 2023-2025 models I started up my car in morning and was about to reverse out of my driveway. I heard a pop near the rear of my vehicle and then saw a "Check Electric Vehicle System" warning and battery light indicator on my dashboard. I tried driving around for a couple of minutes around my area, the car would not accelerate over 20-25 mph. I returned home and looked up the issue. My Hyundai app showed a Diagnostic Code of DTC P1A9096, which is related to the ICCU. I already have my car at a local Hyundai dealership to get it repaired under warranty but if it wasn't, I can only imagine the price it would cost to get this repaired. There should be more recalls.
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