TECHNICAL SERVICE BULLETIN: TRANSMISSION FLUID APPLICATION GUIDE - This bulletin has been revised to include additional information. New/revised sections of this bulletin are indicated by a black bar in the margin area. This bulletin provides information relating to the correct transmission fluid type and fill quantity requirement for each Kia model. A flush is required ONLY when a transmission is replaced, and the transmission oil cooler is transferred to the new transmission.
full bulletin at NHTSA ↗2022 Kia EV6 powertrain problems
moderate Owners of the 2022 Kia EV6 have filed 41 NHTSA complaints about the powertrain at roughly $2,500 to repair (U.S. federal records, as of July 2026). Source: NHTSA Office of Defects Investigation. See powertrain across all vehicles →
Complaints
41
Recalls
0
Avg fix
$2,500
| Model year | powertrain complaints |
|---|---|
| 2022 EV6 (this page) | 41 |
| 2023 EV6 | 24 |
| 2024 EV6 | 15 |
| 2025 EV6 | 12 |
1crash
What stands out
Of the 4 model years of Kia EV6 we track for powertrain problems, this one carries the most owner complaints on file — 41.
Owners have filed 41 powertrain complaints with NHTSA against this vehicle, but no formal recall covers the issue — the federal record reflects what manufacturers have admitted, not everything owners are reporting.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering powertrain on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
This bulletin provides information relating to the correct transmission fluid type and fill quantity requirement for each Kia model. A flush is required ONLY when a transmission is replaced.
full bulletin at NHTSA ↗PITSTOP: AWD SYSTEM CONCERN DUE TO TIRE CIRCUMFERENCE - This Pitstop provides information regarding potential concerns with the All-Wheel-Drive (AWD) system due to tire sizes of differing circumference. Some customers may complain of a chatter sensation felt in the drivetrain of the vehicle and/or the failure of drivetrain component(s). A difference in tire size (width, aspect ratio, construction, rim diameter etc.) may be the cause.
full bulletin at NHTSA ↗PITSTOP: MAINTAIN NEUTRAL (N) POSITION FOR AN AUTOMATED CARWASH - This bulletin provides information on how to maintain the Neutral (N) position on 2022MY~ EV6 (CV) vehicles when using an automated car wash. When the vehicle is in 'READY' mode, safety systems are active and can unexpectedly apply either the Electronic Parking Brake (EPB) and/or shift into Park (P) when events such as opening the doors, unlatching seatbelts and/or vehicle rollback is detected. This can cause issues when using an automated car wash, particularly those where the vehicle is sent through without a driver.
full bulletin at NHTSA ↗TECHNICAL SERVICE BULLETIN: TRANSMISSION FLUID APPLICATION GUIDE - This bulletin provides information relating to the correct transmission fluid type and fill quantity requirement for each Kia model. A flush is required ONLY when a transmission is replaced, refer to applicable vehicles in the chart starting on page 2.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
Thirty-nine complaints center on ICCU failure—a control module that manages charging and 12V power. The failure mode is consistent: owners hear a loud pop or clunk, then get a dashboard warning ("Check electrical vehicle system," "Stop vehicle and check power supply"), followed by either complete power loss or severe speed limitation (10–25 mph limp mode). Many report the failure occurs with zero warning while driving on busy roads or highways, forcing them to coast to safety or get stranded mid-traffic. One owner lost power at a traffic light; another on an interstate.
The 12V battery drains completely during ICCU failure, killing all accessories (door locks, starter, dash lights). Owners cannot jump-start the car normally; roadside assistance must use a power pack to shift the car into neutral for towing. Several owners report this happened after completing recall SC302 or SC327, which involved ICCU software updates. The critical complaint: dealerships are replacing the ICCU with new units, but those units fail again—sometimes within weeks or a few thousand miles. Two owners report the ICCU failing a second or third time. Parts are often on national backorder with no ETA, leaving vehicles at dealerships for weeks. One owner was denied warranty coverage despite the 10-year/100,000-mile EV powertrain warranty, citing the basic 60,000-mile coverage instead. A separate complaint documents MCU failure causing loss of acceleration and disabling all active safety systems while driving.
Same Kia EV6 powertrain reports on nearby years: 2023 · 2024 · 2025
Failure modes owners describe
ICCU (Integrated Charging Control Unit) failure with 12V system drain and power loss
The ICCU fails suddenly, causing the 12V battery to drain, loss of high-voltage power, and complete vehicle shutdown while driving or at rest. Owners report the failure occurs with no advance warning and can strand the vehicle mid-traffic or cause severe speed reduction (limp mode at 10-25 mph). The issue is known to recur even after replacement with new units under recall.
When: Failures reported from ~11,200 miles to 64,300 miles; many occur well within warranty period and some after prior ICCU replacements.
Symptoms owners cite: Dashboard warning: 'Stop vehicle and check power supply,' 'Check electrical vehicle system,' 'Check electric vehicle system'; Vehicle enters 'Turtle Mode' (severe speed limitation to 10–25 mph); Total power loss while driving or inability to start from rest; Loud pop or clunk noise from rear/undercarriage immediately preceding electrical failure; All electrical systems become inoperable: dash lights off, door locks fail, shift controls fail, starter will not engage; 12V battery drained to zero despite being previously charged; Warning lights for '12V Battery Very Low' and 'Critical Battery System'; Battery discharge warning messages upon attempted start
Codes mentioned: MCU P0A4100, LKAS C164286, MCU P0C1700, DC/DC Converter input voltage sensor fault
Repairs/costs cited: ICCU replacement required; dealership parts often on national backorder with no ETA. Some owners report ICCU replaced multiple times (up to 3 replacements in one vehicle). Replacement ICCU units sometimes fail again. One owner cited $4,000 replacement cost. Some dealerships have replaced ICCU along with 12V battery, inverter, and ICCU fuse. One owner reported warranty claim denied despite 10-year/100,000-mile EV powertrain warranty, citing basic 60,000-mile coverage instead.
Recalls/TSBs owners mention: Recall SC302 / NHTSA Campaign 24V200000 (September 2023) and recall SC327 involved software updates to the ICCU, but owners report failures continue after recall completion. One dealership manager confirmed awareness of the issue and familiarity with the problem occurring repeatedly. Kia corporate has acknowledged the problem as 'known' but replacements continue to fail. No extension of warranty coverage or permanent redesign reported. One owner noted EU and some Asian countries extended warranty for this fault due to prevalence.
Charging system failure (Level 2) with ICCU malfunction
Vehicle fails to charge via Level 2 home charger (9.6 kW rated) despite Level 3 DC fast charging working normally. Charging stops abruptly after ~1 hour with hot charging port; unplugging and reconnecting restores temporary function. Issue linked to ICCU failure and 12V battery drain.
When: Failures occur over several months prior to total power loss; one owner had issue at ~11,200 miles; another at approximately 3 years / 40,000+ miles.
Symptoms owners cite: Level 2 charger stops charging after ~1 hour with elevated charging port temperature; Vehicle does not respond to charging initiation (no 'vehicle being charged' audio confirmation); Level 3 DC fast charging works normally; Battery charge reading shows full charge but displays incorrect range (e.g., 125 miles on small charge) and fluctuates without reason; Low-voltage system fails to maintain 12V charge between charging sessions
Repairs/costs cited: ICCU replacement required. Software updates applied per recall did not resolve issue. One owner lowered recommended charging amperage per manufacturer spec but issue persisted.
Recalls/TSBs owners mention: Recalls SC302 and SC327 involved software patches and charging protocol updates, but owners report continued failure after recall completion.
MCU (Motor Control Unit) and active safety system failure
MCU malfunction causes stuttering acceleration, sudden loss of acceleration capability (vehicle tops out at ~60 mph despite full throttle), and complete disabling of active safety systems (LKAS, collision avoidance, lane-keeping assist). Fault codes indicate high-voltage electronics failure.
When: Reported at 64,300 miles; failure occurred while driving and recurred immediately after dealer inspection.
Symptoms owners cite: Engine stuttering during acceleration; All driver-assistance and safety systems disabled (LKAS, collision avoidance, lane keeping); Vehicle cannot accelerate above ~60 mph despite full pedal input; Fault codes present but no confirmed dealer diagnosis provided; Failure reproducible and recurring
Codes mentioned: MCU P0A4100, LKAS C164286, MCU P0C1700
Repairs/costs cited: Vehicle inspected by dealership but no confirmed diagnosis or resolution provided; dealer has not confirmed whether HV battery was dropped/reconnected during service.
Synthesized from 41 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 4 most recent
While driving, the car all of a sudden lost power - forcing me to pull over. If this were to happen while on the freeway, a crash would have been imminent. This is a known issue with kia/Hyundai EV's where the ICCU fails and causes the vehicle to lose power suddenly.
My ICCU failed while I was driving and I lost power while in a light controlled intersection in Chicago. The screen turned off and I could not see my speedometer or any driving information. I luckily was able to roll to the side of the road and park the car. My car could not change gears, doors would not work, trying to jumpstart the 12V did not work.
The electrical system failed (dashboard warning light appeared while in park) and then a pop was heard (fuse bursting). Car could not safely drive. Dealer confirmed ICCU failed once checked at dealer. No prior warnings noticed and no issues charging with approved systems leading up to the failure.
In November 2024, my 2022 Kia EV6 became suddenly non-drivable due to electrical failure consistent with a repeat ICCU/12-volt system malfunction. The vehicle would not start or maintain normal electrical power and became stuck in accessory mode, creating a loss of propulsion and complete loss of transportation. This vehicle previously experienced an ICCU failure earlier in 2024 that required…
Had powertrain trouble with your 2022 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 2022 Kia EV6?
It's a documented issue but not catastrophic. 41 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?
Based on the 41 complaints filed, powertrain issues most often appear around 3,000 miles. Some report problems earlier; some make it well past 150,000 with no symptoms. Maintenance habits matter — vehicles that received timely fluid services and were not regularly overworked tend to last longer.
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/2022/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.