OBD-II code · Powertrain (generic)
P0AA6 Hybrid Battery Voltage System Isolation Fault
The BMS isolation monitor detects insulation resistance between HV positive/negative bus and chassis ground below the safe threshold, indicating insulation failure somewhere in the HV system.
Is it safe to drive with P0AA6?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyHV cable insulation damaged
- PossibleMoisture intrusion in HV component
- Less likelyAged HV component insulation
Repair at a glance
- Difficulty
- Shop_only
- DIY friendly
- Best left to a mechanic
- Typical labour
- 3–14 h
- Emissions test
- Usually unaffected
- Parts involved
- Hv Battery, Hv Cabling, Inverter, Charger
Related codes
- P0AA3Hybrid/EV Battery Negative Contactor Circuit
- P0AA4Hybrid Battery Negative Contactor Circuit
- P0AA5Hybrid/EV Battery Negative Contactor Circuit Stuck Open
- P0AA7Hybrid/EV Battery Voltage Isolation Sensor Circuit
- P0AA8Hybrid/EV Battery Voltage Isolation Sensor Circuit Range/Performance
- P0AA9Hybrid/EV Battery Voltage Isolation Sensor Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.