Powertrain
generic / SAE
P0E72
Hybrid/EV Battery Internal Isolation Performance
The BMS detects degraded internal isolation between HV bus and battery enclosure. Insulation resistance below safety threshold.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / numberE / 72
Possible causes
- Internal cell insulation aged high
- Internal moisture 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: 1000–8000 €
- Estimated time: 4–20 h
- Component: hv battery pack
- Component: bms
- Component: isolation monitor
- MIL / check engine light
- limp mode possible
Sources
References
sae:J2012