4xe 12V Battery Parasitic Drain
SeriousElectrics & ElectronicsThe Telematics Box Module (TBM) can stay "awake," draining the 12V battery completely overnight. This is especially common if the vehicle is left plugged into a charger after reaching 100%.
Est. Repair Cost: £150–£300 (Update/Replacement)
Warning Signs:
Dead battery after being parked, Stop/Start unavailable, "Service Hybrid System" warning, Vehicle unresponsive to key fob
What to Inspect:
- Check battery health
- Ensure TBM and BCM software updates have been applied
Verified by IsItAGoodCar Research Team