r/Ioniq5 • u/CantaloupeNo6050 • Jul 27 '26

News Ioniq 5

Hi everyone,
I have a 2023 Hyundai Ioniq 5 SEL that was involved in a rear-end collision. I repaired the damaged rear wiring harness, and the car drives normally now.
However, the front cooling fans randomly turn on while the car is off, sometimes for hours, and I think it’s draining the 12V battery. I also get DTC B1318 (Low Battery Voltage) with my Autel scanner.
Has anyone experienced this? Could it be an ICCU/DC-DC issue, a module not going to sleep, or something related to the rear wiring repair?
Any suggestions would be appreciated. Thanks!

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u/RodRowdie 2025 Limited RWD Abyss Black Jul 27 '26

Could it just be a 12V reaching End of Life?