Powertrain
generic / SAE
P2C85
Hybrid/EV Battery Voltage External Isolation Fault
The hybrid control module detects an isolation fault between the high-voltage battery and the vehicle chassis. Indicates degraded HV insulation.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / numberC / 85
Possible causes
- HV cable insulation chafed against chassis high
- Moisture in HV connector medium
- Pack cell imbalance approaching service threshold low
Symptoms
- EV/hybrid system warning light on
- Reduced power output or limp mode
- Charging may fail or be slowed
- Reduced electric range
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 500–5000 €
- Estimated time: 3–16 h
- Component: hv battery
- Component: hv wiring
- Component: isolation monitor
- MIL / check engine light
- limp mode possible
Sources
References
sae:J2012