NHTSA Complaint #11709002 — 2025 HYUNDAI IONIQ 5

Received the following warning while driving my 2025 Hyundai Ioniq 5 SEL on the highway on X-mas night: "Battery Overheated! Pull over safely and leave the vehicle." Within a few miles, was able to pull over at the nearest exit and park the car off the highway. Then turned the car back on to see if the error message was still present and drove another mile, only to get the same error message. As soon as I pulled into an empty parking lot, the car lost power and was not functioning (ie unable to accelerate). I received a further "Battery Management System" error in the Vehicle Diagnostics dashboard. It was raining outside so was very uneasy that I was prompted to leave the vehicle with two young kids in the backseat. We took an Uber home which was a couple miles away from the parking lot where my stranded car was located. I had the vehicle towed to Hyundai San Leandro on 12/26/25, it was inspected on 12/30/25, and was notified by the dealership service center on 1/2/26 that the ICCU may need to be replaced to resolve the issue. They did not confirm whether they were able to reproduce the issue but I see two DTC error messages in my Hyundai app (DTC P1B9700 and DTC POA9B11). It was indicated that an ICCU was ordered which should arrive by 1/8-1/9 (3-4 days from 1/2) . If swapping in a new ICCU doesn't resolve the issue, then it was indicated that I may need a new BMS module. I was given the option to get a rental car from Enterprise (as early as the weekend of 1/3-1/4) and get reimbursed later or a loaner vehicle could be provided (if available) by the dealership sometime during the week of 1/5.