We were driving and vehicle suddenly showed multiple warnings including check forward/side safety system, check change lane assist, check inattentive driving warning, check lane safety system and then things went away and it showed 4 needs attention represented by triangle with exclamation point. We also seemed to lose power steering assist. It could drive but was "heavy". We were on highway trying to figure out what to do and what was wrong. Isolated stretch of highway at night. Suddenly the multiple warning flashed again. We were trying to determine what to do. The car seemed to drive fine except power steering seemed heavy. Suddenly a violent "jerk" occurred with vehicle sending us into the other lane. Fortunately, we were by ourselves on the highway and no crash or other vehicle impacted. Instantly, after the violent "jerk" the car was back to normal. Steering normal and all warnings went away. We have a video and pictures of the incident. It seems related to functional 12 V battery based on my assessment. There was a recall of the ICCU and software to charging the battery.
Hyundai Ioniq 6 loss of power problems
13 of the 131 owner complaints about the Hyundai Ioniq 6 describe sudden loss of power, most of them for the 2023 model year.
- owner complaints
- 13
- worst model year
- 2023
By model year
Often reported together
What owners say
I experienced a safety critical failure in my 2024 Hyundai Ionic 6. While attempting to start the vehicle, the car displayed a red 12 Volt battery warning light, a battery discharge warning, and then refused to enter ready mode. The vehicle would only shift into neutral and was completely undrivable. After sitting for many hours, the vehicle started again, which is consistent with an intermittent ICCU/DC-DC converter dropout. This type of failure is known to cause loss of power and has been documented in the federal safety agency investigation PE23-011 for other Hyundai EV's. The dealership states they cannot replicate the issue and refuses further diagnostics. Hyundai corporate is deferring entirely to the dealership and will not authorize a loaner or confirm reimbursement, leaving me without transportation. They also stated they cannot commit to any repair unless the failure happens again despite the clear safety implications. This failure mode can cause sudden loss of motive power, which poses a serious risk if it occurs at highway speeds. I am reporting this because the vehicle is unsafe to operate, the failure was severe, and Hyundai is refusing to investigate the root cause unless it reoccurs. I am requesting the federal safety agency review this incident as part of the ongoing concerns regarding ICCU/DC-DC failures in Hyundai E-GMP vehicles.
While driving on the highway, there was a complete loss of power and steering. I was able to navigate to the side of the road. The vehicle would not start on multiple occasions, and no warning lights illuminated. The vehicle was taken to the dealer, where it was stated that the issue could not be duplicated. The vehicle was not repaired. The manufacturer was not notified of the issue. The approximate failure mileage was 18,000.
On April 10,2026 I heard a pop while driving and a check electrical system light came on, my vehicle lost power while driving. This appears to be a common problem with ioniq5 and 6 going back years. Also failure in their ICCU and 12 volt batteries.A veh. Losing power unexpectedly could lead to a collision, injury or worse.my Ioniq 6 was recently serviced and only has 14,794 miles.I respectfully urge the federal safety agency to: 1.continue and expand investigation into electrical system failures in the Hyundai ioniq 6 and 5. Also 2. Ensure that affected vehicles are properly repaired with permanent solutions or the company should have to buy back the unsafe defective vehicles. Also 3. Require clearer and more immediate warnings to drivers regarding the risk of sudden power loss. Drivers should not have to keep experiencing this safety risk, after all these years of it being reported.
I was driving on the highway, 65mph when I had a sudden loss of power, check electrical system warning and a battery picture came on. I was reduced to approx 10mph suddenly in rush hour traffic, in the left lane, with no shoulder to pull over to. I was able, with the kindness of other drivers slowing down, able to move to the right lane, then to the shoulder. Called AAA for tow to dealership. 12v battery and ICCU damage.
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.
A failure of the ICCU resulted in a maximum speed of about 25 mph and eventually a total loss of power.
January 28, 2026 The vehicle has stopped in the middle Of the street with sign «loss of power, check your battery» or something like that and after few attempts to turn it off and on it went to Accessory mode. After 15-20 minutes it completely died. So unsafe with kids in the car during extreme cold temperatures. Free Hyundai road assistance- quoted me 3 hours or so, i had to pay for towing elsewhere. No doubts its iccu, since tow truck driver attempted to jump start and from dead it went to accessory mode and died again almost instantly. I read on the Facebook about iccu problem of Hyundai, if this is engineering defect it should be remedied.
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.
I was driving, there was a loud pop, then warnings popped up on the dash and I lost power. I was able to limp the car back to my house, because I had just left. I assume it is the ICCU. I’m reporting this because it is a known issue that Hyundai has not seemingly been able to repair. With the pedal to the floor, I got up to 25 mph. Luckily, I was near home and not on a highway.
Related recalls
No recalls on record for this model year.
Questions about the Hyundai Ioniq 6 loss of power
Which Hyundai Ioniq 6 years have sudden loss of power problems?
The model years with the most reports are 2023 (5 complaints), 2025 (5 complaints) and 2024 (3 complaints).
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