12V Battery Failure
ModerateElectrics & ElectronicsThe 12V auxiliary battery degrades faster than expected, triggering a cascade of seemingly unrelated high-voltage system errors. A weak 12V battery can prevent the car from starting entirely.
Multiple unrelated warning lights, Car won't start, "Electrical system malfunction", Infotainment resets randomly
- Test 12V battery voltage
- Check service history for replacement
- Look for recent 12V battery fault codes