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.
Most affected: All models
Typical symptoms
- •"Traction Battery Fault" message
- •Car won't "start" or unlock
- •Multiple random "System Failure" warnings
What to inspect before you buy
- ✓Check for error code P1A04
- ✓Verify if BMS has been reset recently
- ✓Test 12V battery load