Driving on three lane highway at 60 mph the car abruptly lost power. Was able to get off the highway. Called Kia roadside assistance. Tow truck picked up car and delivered it to Kia dealership. Service dept diagnosed and is replacing the ICCU.
2025 Kia EV6: sudden loss of power
6 of the 56 complaints about the 2025 Kia EV6 describe sudden loss of power.
- owner complaints
- 6
- of this car's complaints
- 11%
- recalls
- 0
Is there a fix? 6 service bulletins cover this area of the car. See below
Sudden loss of power by model year
What owners say
ICCU failure. Car lost power while driving. I heard a "pop" sound and then the car displayed a warning light moments before losing power. Car was towed to the dealership where they diagnosed and replaced the ICCU and a fuse. This is a known problem since the 2022 model year and seems to be a very common failure that the manufacturer is unable definitively repair. Thankfully I was on a local street and not on a highspeed highway when this occurred.
11/28/25 on freeway car lost power and would only go 25mph and warning light came on. After short distance full power came back. 12/14/25 earliest appt with dealer and could not find problem. 01/09/26 Lost power and took car to dealer. Dealer said bad battery and they replaced battery. 1/20/25 lost power again and limped to dealer. Dealer found bad ICCU. They are now waiting for new ICCU to replace. When your driving 55 mps on freeway and suddenly drop to 25mph this is dangerous. The apx date required below is when I have taken the car and dealer confirmed ICCU problem not the original problem date of 11/28/25.
Was driving home lost all power. Caution lights came on. The ICCU, relay switch, 2 fuses. went bad. It took 9 weeks for KIA to fix, no compensation.
I was driving on the highway when I heard a pop like a loud fuse sound from the back seat area. Suddenly the car dropped 15 mph from 70 mph to 55 mph and the battery and electrical system warning lights came on and the vehicle said check electrical system. I was able to continue with my hazard lights on to exit the highway, at which point the max speed of the vehicle dropped to 45 mph. It would not go faster no matter how hard I pushed the gas pedal. I was able to pull over to a gas station and park in a spot but the vehicle had to be towed. When the tow truck arrived, the vehicle also flashed with the 12V battery low warning. It was diagnosed as a failed ICCU, which rapidly drained the 12V battery. The car is only 4 months old with about 7,300 miles. This is a serious safety concern, especially with the sudden failure and loss of power. I’m lucky I wasn’t hit and that I was able to get off the road before it totally died.
ICCU failure caused loss of power on interstate. I almost got in a wreck because of this. Kia dealer refused to look at my car. Took vehicle to independent repair shop who diagnosed issue.
Service bulletins that may apply
- Voluntary service campaign: owner notification follow-up (SC373B1)
- Voluntary service campaign: 3-WAY coolant valve replacement (SC373
- Voluntary service campaign: owner notification (SC373B)
- Voluntary service campaign: 3-WAY coolant valve replacement (SC373)
- Voluntary service campaign: dealer principal memo (SC373)
- Voluntary service campaign:dealer parts and service manager memo (SC373)
Related recalls
No recalls on record for this model year.
Questions about the 2025 Kia EV6 loss of power
Is sudden loss of power a common problem on the 2025 Kia EV6?
6 of 56 owner complaints about the 2025 Kia EV6 (11%) mention sudden loss of power. The model year with the most reports is 2022.
Is there a recall or service bulletin for this on the 2025 Kia EV6?
There are 0 recalls and 6 service bulletins for the same area of the car. Check them below with your VIN.
VIN decoder
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