12V Battery Drain and Non-Start
ModerateElectrics & ElectronicsA well-documented VW Group PHEV issue: the 12V battery drains while the car is parked or even while the high-voltage battery is charging. Modules continuously draw power from the 12V battery even when parked, and it is only recharged when the high-voltage system is fully energised.
Most affected: Superb iV PHEV, All variants with keyless entry
Typical symptoms
- •Car won't start after standing overnight
- •Multiple warning lights on dashboard
- •12V battery needs frequent replacement
What to inspect before you buy
- ✓Ask about 12V battery age and any non-start incidents
- ✓Check if trickle charger was used
- ✓Enable HV Battery Protection in the Skoda Connect app