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.
Affected components
- Hv battery
- Hv cabling
- Inverter
- Charger
Common causes
- High likelihood: HV cable insulation damaged
- Medium likelihood: Moisture intrusion in HV component
- Low likelihood: Aged HV component insulation
Diagnostic notes
- The malfunction indicator lamp may illuminate
- Reduced-power or limp mode may occur
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.