Kia EV6 overheating problems

Filed Apr 23, 2026 · Electrical · TX

The Integrated Charging Control Unit (ICCU) failed twice within four weeks. The first failure occurred in March 2026 and was repaired under recall SC327 with a replacement ICCU and fuse. The second failure occurred April 7, 2026, approximately 12 days after pickup. Symptoms: Vehicle failed to charge overnight on Level 1 and Level 2 circuits despite being plugged in. Later that day, while driving, a “Check Electrical System” warning appeared on the dashboard followed by sudden loss of power and acceleration. Vehicle fluctuated between 25-45 mph and could not maintain speed. Vehicle was driven approximately 2.2 miles to the dealership under its own power after warning onset. Safety risk: Sudden loss of power and acceleration while driving created a hazardous condition for myself. Dealer confirmation: The authorized Kia dealer confirmed a DTC for battery overheating and acknowledged the ICCU coolant was not fully topped off after the first replacement, suggesting the recall remedy was incompletely performed. The vehicle has remained at the dealer unrepaired since April 10, 2026. Component available for inspection: Yes, vehicle is currently at the dealership. Recall remedy concern: The SC327 recall remedy did not resolve the ICCU failure. A second failure occurred within two weeks of the repair. The dealer’s subsequent diagnosis of owner-caused undercarriage battery damage is contradicted by their own signed inspection report documenting all undercarriage items as passed with no damage noted

Filed Apr 8, 2026 · Electrical · IL

ICCU failure at 16k miles. The ICCU was replaced at the dealership on January, 29th of this year, so it is not available for inspection. The failure tripped a breaker at my home while it was charging possibly indicating a short circuit. The short circuit could have potentioally overheated and caught fire in my home. I took the vehicle to the dealership and they confirmed it was the ICCU and replaced it under warranty. I have a copy of the invoice received after the replacement was installed. I do not know what they did with the old ICCU after it was placed. There was no indication of pending failure that I noticed prior to this incident occuring.

Filed Apr 2, 2026 · Electrical · SD

Electrical propulsion failure resulting in 3 tow-ins. Vehicle goes into limp mode, slows to 20 mph on highway and then stops after about 2 miles. The issue appears related to the ICCU, fuse and 12V battery failures. History includes 6 attached ICCU related Repairs. #1 ICCU updated under recall SC271 at 31,678 miles. #2 Then the ICCU was replaced under recall SC302 at 45,059 miles. #3 Then the ICCU was replaced along with fuse and 12V battery after on road failure and tow in at 52,296 miles. #4 Then the ICCU was updated under recall SC327. #5 Then the ICCU, fuse and 12V battery was replaced at 69,849 miles under recall SC327 after another on road failure and tow in. #6 Then there was a ICCU overheat and charging fault related to a bad ICCU coolant reservoir cap after a charging failure and tow in at 70,957 miles.

Filed Sep 4, 2024 · Electrical · ID

The ev6 12 volt battery is not being charged by the main battery. It was recalled for overheating and not charging. I took it in and it was supposedly fixed. Took about three weeks. It happened again and I didn’t have my car for three weeks. I am now on my third time where the small battery is not charging and we were almost stranded.

Filed Feb 25, 2024 · Engine · MD

Component/System Failure: The main components that failed or malfunctioned include the vehicle's charging system and battery management system, leading to significant range discrepancies and charging issues. Additionally, the coolant system issue suggests a failure in the vehicle's cooling system. These systems are available for inspection upon request to further diagnose and address the underlying problems. Safety Risks: The safety of the vehicle's occupants and others was put at risk due to the potential for being stranded in unsafe or remote locations, as experienced on [XXX], in Pennsylvania. The inability to reliably charge the vehicle and the coolant system issue could also pose a risk of overheating, potentially leading to engine damage or failure while in operation. Problem Reproduction/Confirmation: The range and charging problems have been repeatedly reproduced and confirmed by both dealership service departments and independent service centers during multiple service visits. The coolant system issue was also identified and addressed during these visits, indicating a persistent and recurring problem. Inspections: To date, the vehicle and its components have been inspected by dealership service departments on several occasions as part of the attempted repairs. There have been no specific inspections by the manufacturer, police, insurance representatives, or others outside of these service visits. Warning Lamps/Messages/Symptoms: Prior to the failure, there were instances of warning messages related to the vehicle's charging system and battery health. The first indications of these issues appeared shortly after purchase, escalating to the point of the vehicle being stranded due to insufficient charge. The coolant system issue was initially noted without specific warning lamps but was confirmed upon inspection during a service visit. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Feb 6, 2024 · Engine · MD

1. **Component/System Failure**: The vehicle's cooling system is repeatedly losing coolant, suggesting a leak or malfunction. The system has not been officially diagnosed due to technician availability but is available for inspection. 2. **Safety Risks**: The frequent need to refill coolant raises concerns about engine overheating, posing a potential safety hazard during operation. 3. **Problem Confirmation**: The issue has been consistently observed by the owner, requiring coolant to be refilled three times in 49 days. However, a formal diagnosis by a dealer or service center has been hindered by a lack of available technicians. 4. **Inspections by Parties**: The vehicle has not yet been inspected by the manufacturer, police, insurance representatives, or other third parties concerning this coolant issue. 5. **Warning Signs & Symptoms**: No warning lamps or messages have indicated a problem prior to noticing the coolant depletion. The issue was identified only through physical checks of the coolant level.

Filed Dec 22, 2023 · Electrical · MD

Hello the federal safety agency, I hope this message finds you well. I would like to provide specific details regarding the issues with my car as per your guidelines: 1. **Failed Component or System:** The charging system has malfunctioned, leading to extreme range decrease, constant charging failures, inconsistent charging speeds, and signs of overheating. The charging system warning light is on. 2. **Availability for Inspection:** The malfunctioned charging system and associated components are available for inspection upon request. 3. **Safety Risk:** The safety of myself and others is at risk due to the potential for unexpected vehicle breakdowns, especially during charging, and the indication of overheating poses an additional safety concern. 4. **Confirmation by Service Center:** The problem has not yet been confirmed by a dealer or independent service center, but a service appointment has been scheduled to address and diagnose the issues. 5. **Inspections by Others:** The vehicle has not been inspected by the manufacturer, police, insurance representatives, or other third parties at this point. 6. **Warning Lamps or Messages:** The charging system warning light is the primary symptom, appearing alongside extreme range decrease, charging failures, and inconsistent charging speeds. These issues manifested without prior warning. I appreciate your attention to these specific details and look forward to resolving these concerns promptly.

Filed Jul 24, 2023 · Fuel system · DC

Inlet charging port overheats causing charging to be interrupted when using 40A or higher EVSE. This is dangerous because the charging port or the wiring harness behind it is overheating because of high electrical power which can cause a fire. Kia has acknowledged this problem by issuing a TSB which reduces the charging rate when the overheating is detected but this does not solve the actual problem with the port or wiring harness.

Filed Jun 21, 2023 · Electrical · VA

EV charging on Level 2 was overheationg the charging port, terminating the charging session. KIA released TSB ELE 283 software update. The software update throttled the charging so it only charges at half speed and does not overheat the port. To me this is a bandaid for faulty charging ports and that there is no guarantee there will be a failure of the port causing electrical failure and possibly even a fire. This was evaluated at the dealer and confirmed the charging speed is throttled. They could not do further evaluation unless I committed to leave the car for days, possibly weeks to work with KIA Tech Line to further diagnose. This is a known issue and others have had their charging port replaced after a lengthy stay at the service department. It appears this may be a bad batch of charging ports causing this overheating and failure

Filed Jun 15, 2023 · Electrical · TX

This car advertises that it is capable of fast charging on a level 2 charger up to 50amp. I purchased a level 2 charger capable of 50amps, but it causes the EV6 to overheat and stop charging. The dealership installed TSB ELE-283 but this does not fix the problem and is not an acceptable fix. I have owned this car 5 months, and it has been to the dealership service department 3 times for failing to charge. Kia has admitted that their dealerships don’t have the capacity to charge at the higher speeds, so they cannot replicate the issue and just keep giving me my faulty car back. While the expectation is that the car can charge at 48 or 50 amps, typically it fails at 40 amps and users are forced to reduce to 36 amps, which is not what was advertised. The Kia website advertises 11kW on-board charger (OBC) for Level 2 recharging from 10-100% in 7 hours, which is unachievable due to constant overheating. I have a ChargePoint home flex charger set at 48amps.