P0D12
Battery Charging System Negative Contactor A Control Circuit Range/Performance
The negative contactor A of the battery charging system reports a control circuit range/performance condition. HV charging path cannot be commanded reliably.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: hard
Common causes
Ordered by how often each turns out to be the cause.
- Coil resistance driftedCommon
- High-resistance contactPossible
- Sensor element aged beyond calibration windowLess likely
Parts involved
- Bcs Neg Contactor A
- Wiring Harness
- Bms
P0D12 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.