P0AA1
Hybrid Battery Positive Contactor Circuit
BMS detects an electrical fault in the positive HV contactor coil circuit. The contactor connects the battery positive terminal to the high-voltage bus.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: shop_only
Common causes
Ordered by how often each turns out to be the cause.
- Contactor coil openCommon
- Wiring faultPossible
Parts involved
- Hv Contactor Positive
- Bms
- Wiring Harness
P0AA1 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.