- Hyundai, Kia, and Genesis EV owners say ICCU failures are still stranding drivers.
- Lawsuit claims replacement ICCUs may be just as defective as the originals.
- 12-volt battery drain, limp mode, and total power loss remain key complaints.
Hyundai and Kia have built some genuinely impressive electric vehicles over the last few years but one issue continues to plague many owners. A single part called the Integrated Charging Control Unit, or ICCU for short, manages charging between the high-voltage battery and the 12-volt system to ensure both systems work properly and in harmony.
The thing is that when the ICCU fails, the car can largely become a giant brick. Hyundai and Kia have issued recalls to fix ICCU-related issues but now a class action lawsuit claims that the fix is just using more bad parts.
More: Hyundai Fixed His ICCU Then Let Thieves Total The Rest Before He Even Saw It
The lawsuit, filed in U.S. District Court for the District of New Jersey, targets Hyundai Motor Company, Kia, Genesis Motor, and Hyundai Kefico, the supplier behind the charging control units. Affected vehicles include the 2022–2024 Kia EV6, 2022–2024 Hyundai IONIQ 5, 2023–2025 Hyundai IONIQ 6, 2023–2025 Genesis GV60, 2023–2025 Genesis Electrified GV70, and 2023–2024 Genesis Electrified GV80.
According to the filing reviewed by Carcomplaints, the central grievance isn’t that these cars have problems. It’s that they allegedly keep having them after a recall was meant to put the matter to rest. Two plaintiffs, Hayes Young of New Jersey and Roy Williams of Kentucky, say their recall service accomplished nothing.
Young says his 2023 IONIQ 5 SEL suffered a dead 12-volt battery in December 2025 that required replacement under warranty. He claims the problem returned, and his dealer allegedly pointed to the ICCU as the cause, yet no replacement was offered.
Williams says his leased 2025 EV6 entered limp mode after a loud bang, requiring a tow to the dealer. After battery charging, software updates, and eventually a battery replacement failed to solve things, the ICCU was reportedly replaced in March 2026.
The lawsuit also cites owner complaints involving charging plug damage during home charging and dashboard warnings like “Check Electric Vehicle System” and “12-volt battery voltage low stop safely.”
Importantly, none of the defendants (Hyundai, Kia, etc) has responded to the suit. Typically in cases like this, the automaker(s) will file a motion to dismiss but it may be several days or longer before the next step in the process takes place.
