ICCU Flaws Put Hyundai, Kia, Genesis EVs at Risk of Power Loss, CR Finds

Consumer Reports warns that Hyundai, Kia, and Genesis electric vehicles can experience ICCU (Integrated Charging Control Unit) failures that compromise the 12-volt system and cause power loss or inoperable features, even with adequate main-battery charge. CR surveyed about 380,000 owners; ICCU-related issues affected roughly 2–10% of Hyundai/Kia EV owners, far higher than typical charging problems. The fault stems from a transistor in the ICCU failing due to overvoltage at the start or end of charging. Repairs vary from software updates to replacing the ICCU and fuse plus a coolant flush, with some costs reimbursed. Hyundai says parts are shipping and some expenses will be reimbursed; Kia has parts in stock; Genesis did not comment. The Ioniq 5 performed relatively well in CR’s testing, but ICCU reliability drags overall scores and recalls have occurred in the past.