12V Battery & BMS Sensor Glitch
SeriousElectrics & ElectronicsA failing 12V battery or a glitchy Battery Monitoring System (BMS) sensor can trigger a "Traction Battery Fault" or total vehicle shutdown. The car is extremely sensitive to 12V health.
"Traction Battery Fault" message, Car won't "start" or unlock, Multiple random "System Failure" warnings
- Check for error code P1A04
- Verify if BMS has been reset recently
- Test 12V battery load