Kia EV6 battery drain problems

Filed Sep 8, 2026 · Electrical · WA

The ICCU, or integrated charge control unit, continually fails on this car. When it fails, the 12V battery rapidly drains and the car goes into turtle mode (25mph max) until the 12 battery drains completely. This has happened 4 times on this car, twice since I purchased it 'certified pre-owned" from a Kia dealership in February 2026. Luckily for me the two times it has failed on me, I was in town and close to home. I purchased this car to use for road trips, and out in remote areas of wilderness that do not have cell reception. It is my opinion that the lack of a permanent fix from Kia is a safety issue, as this problem can strand a driver like myself in the middle of nowhere without cell service or any way to get back. Kia has increased warranty coverage on this component, but has not rolled out a permanent fix. My car has been sitting at a dealership service department for 4 weeks now, waiting for Kia to approve the warranty work. This is a known issue, Kia has increased warranty coverage on this part, but they are refusing to allow the dealership to perform the work to fix it.

Filed Mar 1, 2026 · Electrical, Engine · MO

Persistent ICCU failure causing charging interruptions, “Check Vehicle Charging System” → “Stop vehicle and check power supply” warnings, low 12V battery voltage (down to 12.1V), and risk of power loss/strand. Kia Connect sent “Charge Interrupted” alert during a session that reached 99%. Multiple prior recalls/attempts failed to resolve (Sep 2023 TSB ELE291 BMS, Jun 2024 SC271 ICCU SW, Jan 2025 SC273 VCU SW, May 2025 SA5999 limp-home logic, Sep 2025 dead 12V stranding). Towed Feb 2026 after stranding; dealer confirmed ICCU failed (DTC P1A9096), replaced ICCU (P/N 36400-1XFA0AQQK latest revision), fuse, and SW update under SC327 (24V‑867). Repair completed same day (Feb 24, 2026), but dealer skipped charging system test and filling coolant. Safety impact: Stranded wife twice (dead battery and iccu failure), tow required, potential sudden power loss while driving. Report purpose: Document recurrence despite multiple recalls; seeking the federal safety agency tracking for effectiveness of SC327 remedy.

Filed Feb 28, 2026 · Electrical · MD

While charging my vehicle at a level 2 charging station, my vehicle ceased charging. I received no other warnings or symptoms prior to my vehicle ceasing to charge. Upon being alerted by the Kia Access app that the charging stopped, I went to check my vehicle and none of my doors would unlock in response to the buttons on my keys. I had to manually unlock my driver side door in order to enter my vehicle. I attempted to start my vehicle and unplug/re-plug in the charger, but my vehicle would not start or charge. Using a portable jump starter, I was able to jump start my vehicle and begin charging again. However, after approximately 5 minutes of charging, my vehicle stopped charging and once again would not start. At that point, I called for my vehicle to be towed to a Kia Service Center. The Kia Service Center was able to reproduce the problem of my vehicle not starting or charging and informed me that there was an internal short circuit caused by a bad Integrated Charging Control Unit (ICCU). The bad ICCU shorted my ICCU fuse, resulting in the draining of my 12-volt battery. The ICCU and fuse were replaced at no cost to me. Although my vehicle is available for inspection upon request, the parts that malfunctioned have been replaced with new, functioning parts. My safety or the safety of others were not at risk in this situation, but I was fortunate that my 12-volt battery died while parked and charging, not while I was driving, which could have caused an accident.

Filed Feb 17, 2026 · CA

ICCU failed needed replacement, 2 weeks after 12v battery died.

Filed Jan 2, 2025 · Electrical · CA

12 Battery discharging And not recharging while off Charges only when turned on But all other functions as with air conditioning/ heater and alarms workwhile turned off the main battery But battery which runs all functions k n dose not charge it's self and degrades over time. 24v200 recall Ref #sc302 This recall supersedes 24v200. Battery died again after 30 days.voltage went down to 12 volts as normal would be ed 12.8 if working properly This is the 4 th time battery has demishied. Battery was replaced. 1 ,but still dose no g work properly. Have had two recalls that are not on your list. Of problems but I have received from Kia. Check added info. Also if power goes off on the 12 volt car will stop working It's happened twice with this vehicle. Was buy Kia access tow service. I added a cord so I could monitor the off voltage which was isolated to monitor the voltage as there is no way else to do it. When needed to check 12 volt system . I have 9860 mile a on this vehicle. Owned since 2022 march.

Filed Sep 7, 2024 · Electrical · NY

I was pulling into a mall parking lot. The vehicle started beeping and popped up a message on the dash saying "stop vehicle and check power supply". The vehicle slowed to maximum 25 miles per hour. The battery died completely the vehicle has no power at all and cannot be driven or even moved off the roadway - there is no way to even get it into neutral now. The dealership wont look at the vehicle for 2-3 weeks even though it is only 1 year old. I did pull off the road before all this happened but it was so sudden and happened so quickly that I was very aware of how dangerous this could have been had I not heeded that warning immediately.

Filed May 30, 2024 · Electrical · MI

The 12v battery in my vehicle failed due to the known ICCU issue. The dealership has the battery and has since replaced it. I do not know if they keep it for their records or not. My family's safety was put at risk due to the unpredictable timing of the failure, we were parked (thankfully) but there was a massive thunderstorm headed our way and we had to hunker down while waiting for a tow truck and a ride. This issue has been reproduced & confirmed by dealerships and other EV6 users (check [XXX]). The vehicle has been inspected by the dealership but no others at this time. There was no warning that the battery was about to fail, we were out at a park for the day and got in at the end when we tried to turn on the vehicle - it gave us an error "12v battery critically low" and then turned off. Kia has issued a recall for the ICCU, but not covered under this recall is the 12v battery which the ICCU causes to fail early. A bad ICCU (Integrated Current Control Unit) can decrease the lifespan of a 12V battery in several ways: Improper Charging Voltage, Inconsistent Current Flow, Battery Drain, Heat Generation, & Inaccurate State of Charge Monitoring. Kia is fixing the cause of a battery failure but not the battery itself. Thankfully we were parked when the battery failed (no longer will hold a charge) but this is a huge risk and should also be covered in this recall. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Apr 5, 2024 · Electrical · NV

Factory installed 12V battery died at about a year's ownership and about 22,000 miles, leaving me stranded in a remote area. I was fortunate to have a jump start pack to get home. I had the battery tested at an auto parts store and it failed. I replaced it with a lithium car battery with a built-in monitoring system that can be read from the phone. The car routinely runs the 12V battery down to about 50% while driving, then charges it up to 100%. This cycling behavior destroys 12V batteries.The monitor built-in to my lithium 12 V battery shows 26 complete charge/discharge cycles in the 2 months it's been installed. Cars should not fully discharge the 12V battery when being driven

Filed Mar 12, 2024 · Electrical · NC

12v battery died suddenly, prematurely, and unexpectedly while driving at highway speeds. All vehicle safety functions failed and car immediately lost all power. Was able to pull over safely at which point vehicle shut it self off and would not start again

Filed Mar 9, 2024 · Electrical · CA

While driving my car on [XXX] around [XXX] an error message popped up "Stop vehicle and check power supply" and speed of the car started to decline. I could not drive more than 20mph on a main street that had a speed limit of 35 mph. Thankfully I was able to park at a Ralphs in a safe place before the car died. The 12 Volt battery died. If this happened in a freeway this could be a risk if we are not able to stop at a safe location. Towing services was able to tow my car home but I had to keep a portable jumper connected to the car so I can move the car on the flatbed since I couldn't put the car in Neutral for towing. I replaced the 12 Volt battery the next day, but the issue persists and the next available appointment is on April 1st. Upon researching this issue, it is a well known issue with Hyundai/Kia cars and it looks like the ICCU module needs to be replaced. Please look into this issue. Here are some links for reference: [XXX] [XXX] Thank You. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)