P0D12Battery Charging System Negative Contactor A Control Circuit Range/Performance
- Generic OBD-II code · Powertrain
- How the car detects it
- P0D12 points to a control circuit of negative charging contactor A that is electrically intact yet implausible: current, voltage or switching response do not fit the command. No manufacturer documents P0D12 publicly. GM's closest test is P0D11 on the Chevrolet Volt and Cadillac ELR, comparing driver command with line state and coil current, and CARB requires plug-in vehicles to monitor charging components for rationality faults in addition to circuit faults. Corroded terminals, a coil whose resistance has shifted and poor grounds are the usual suspects. Opens fall under P0D11, low and high signals under P0D13/P0D14, the positive side under P0D0B. Charging may drop out or refuse to begin.
- What you may notice
- Charging sessions fail sporadically
- Stored code, possibly with a charging system warning
- Likely causes
- LikelyContact resistance or corrosion in the control circuit connectors
- PossibleContactor coil with shifted resistance
- RarePoor ground of the control module or coil return
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.