On-Board Charger (OBC) / DC-DC Converter 12V Battery Fault
SeriousElectrics & ElectronicsThe integrated power electronics box can fail to wake up the DC-DC converter during vehicle charging, causing the 12V auxiliary battery to discharge and preventing drive selection.
"Electrical Hazard" or "Check EV System" warning on cluster, Car fails to switch to READY mode, 12V auxiliary battery dead
- Check for dealer software updates to the power electronics unit
- Verify 12V battery voltage after AC charging session