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

Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.