Powertrain
generic / SAE
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.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / numberA / A6
Possible causes
- HV cable insulation damaged high
- Moisture intrusion in HV component medium
- Aged HV component insulation low
Inspection / repair
- Difficulty: shop only
- DIY: shop recommended
- Estimated cost: 600–6000 €
- Estimated time: 3–14 h
- Component: hv battery
- Component: hv cabling
- Component: inverter
- Component: charger
- MIL / check engine light
- limp mode possible
Sources
References
sae:J2012