OBD-II code · Powertrain (generic)
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.
Is it safe to drive with P0AA1?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyContactor coil open
- PossibleWiring fault
Repair at a glance
- Difficulty
- Shop_only
- DIY friendly
- Best left to a mechanic
- Typical labour
- 2–8 h
- Emissions test
- Usually unaffected
- Parts involved
- Hv Contactor Positive, Bms, Wiring Harness
Related codes
- P0A9EHybrid/EV Battery Temperature Sensor A Circuit High
- P0A9FHybrid/EV Battery Temperature Sensor A Circuit Intermittent/Erratic
- P0AA0Hybrid/EV Battery Positive Contactor Circuit
- P0AA2Hybrid/EV Battery Positive Contactor Circuit Stuck Open
- P0AA3Hybrid/EV Battery Negative Contactor Circuit
- P0AA4Hybrid Battery Negative Contactor Circuit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.