After 2474 miles, the vehicle Integrated Charging Control Unit (ICCU) failed in my 2025 Kia EV6 making the vehicle undrivable so it had to be towed to the Kia dealer. The ICCU was replaced under warranty. The failure of the ICCU in Kia, Hyundai and Genesis electric vehicles is fairly common and they have yet to come up with a permanent solution.
2025 Kia EV6 powertrain problems
moderate 11 complaints filed with NHTSA · avg repair $2,500 · see powertrain across all vehicles →
Complaints
11
Recalls
0
Avg fix
$2,500
What stands out
Of the 4 model years of Kia EV6 we track for powertrain problems, this one has the fewest owner complaints on file (11).
The failure pattern owners describe
The dominant complaint is Integrated Charging Control Unit (ICCU) failure. Eleven owners report sudden power loss, often accompanied by a loud pop from the rear, occurring between 300 and 7,200 miles. The unit fails during driving—on highways, city streets, and parking lots—without adequate warning. When failure happens, the vehicle shuts down completely: no charging, no power steering, no ability to shift to neutral for towing, and 12V battery unable to hold charge even at high state of charge. Owners are stranded and require towing. Dealers have replaced the ICCU under warranty, but parts are on national back order (147 units reported in transit). Kia has issued multiple recalls since the 2022 model year without resolving the issue. One owner reports failure recurred after replacement.
A separate intermittent transmission issue appears in one complaint: the vehicle rolls forward when placed in reverse on a downhill slope, despite the gear selector showing reverse. Dealer software updates were installed but the core issue was not replicated.
All failures and repairs reported here are unverified consumer allegations.
Same Kia EV6 powertrain reports on nearby years: 2022 · 2023 · 2024
Failure modes owners describe
Integrated Charging Control Unit (ICCU) failure
The ICCU unit fails without warning or with a loud pop sound, causing immediate loss of power, inability to charge, and vehicle shutdown while driving. Multiple owners report this happens at very low mileage and repeatedly even after dealer replacement attempts.
When: 7,200 miles, 300 miles, 2,474 miles, 5 months/7,000 miles; some failures recur
Symptoms owners cite: Sudden loss of all power while driving; Unable to charge vehicle (Level 1 and Level 3 chargers fail); Loud pop or bang sound from rear of vehicle; Charging error and onboard charger fault messages; Check electrical system warning; Check power supply / stop now warning; Vehicle speed limited to 26 mph or unable to move; 12V battery cannot hold charge; Loss of door locks and ability to shift to neutral
Codes mentioned: Charger errors, Onboard charger fault, Error code (specific code not stated in narratives)
Repairs/costs cited: ICCU replaced under warranty; dealer wait times up to 3 weeks; reported national back order with 147 units in transit
Recalls/TSBs owners mention: Multiple recalls issued since 2022 model year; software updates applied by dealers; issue unresolved
Transmission/gear selector malfunction
Vehicle rolls forward when placed in reverse on downhill slope, feeling like car is in drive or neutral instead. Intermittent issue with display showing gear already selected when attempting to re-engage reverse.
When: Intermittent, timing not specified
Symptoms owners cite: Vehicle rolls forward when shifted to reverse on downhill slope; Feels like car is in drive or neutral; Display shows 'gear already selected' when attempting to re-engage reverse; Safety risk of collision with other vehicles
Codes mentioned: Error code (specific code not stated in narratives)
Repairs/costs cited: Dealer could not duplicate issue but found error code; multiple software updates installed
Recalls/TSBs owners mention: Software updates available and installed by dealer
Synthesized from 11 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 4 most recent
Issue Description: When parking facing downhill, I put the car in reverse but the car rolls forward. Feels like the car is either in drive or neutral. Concern is intermittent, and I confirmed each time it happens, gear selector is in reverse. When trying to re-engage reverse, the display shows "gear already selected." Safety risk: Car almost hit car in front of us while trying to reverse. Car…
Power completely dropped while driving in traffic. This occurred several times. I could have easily been rear ended. Also, I could have been stuck within an intersection, I could have been broadsided. I see researched this issue and found it was widely written about in KIA EV6 online forums. Kia should have checked for issues before I leased the 2025 EV and informed me before I made a decision…
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.
Had powertrain trouble with your 2025 Kia EV6?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the powertrain problem on the 2025 Kia EV6?
It's a documented issue but not catastrophic. 11 complaints have been filed. Repairs average $2,500 and most owners catch it before it causes a breakdown.
At what mileage does the powertrain typically fail?
Mileage data is limited for this issue. Owners report failures across a wide range, suggesting cause is more about driving conditions and maintenance than mileage alone.
What does it cost to fix?
Independent shops typically charge around $2,500 for powertrain repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to powertrain?
No active recalls currently cover powertrain issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2025/Kia/EV6.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.