OBD-II code · Powertrain (generic)
P0AA3 Hybrid/EV Battery Negative Contactor Circuit
The HV battery negative contactor circuit reports a generic fault. HV system grounding cannot be commanded reliably.
Is it safe to drive with P0AA3?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyContactor failed
- PossibleWiring fault
- Less likelyPack cell imbalance approaching service threshold
Symptoms
- EV/hybrid system warning light on
- Reduced power output or limp mode
- Charging may fail or be slowed
- Reduced electric range
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 2–8 h
- Emissions test
- Usually unaffected
- Parts involved
- Hv Battery Negative Contactor, Bms
Related codes
- P0AA0Hybrid/EV Battery Positive Contactor Circuit
- P0AA1Hybrid Battery Positive Contactor Circuit
- P0AA2Hybrid/EV Battery Positive Contactor Circuit Stuck Open
- P0AA4Hybrid Battery Negative Contactor Circuit
- P0AA5Hybrid/EV Battery Negative Contactor Circuit Stuck Open
- P0AA6Hybrid Battery Voltage System Isolation Fault
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.