OBD-II code · Powertrain (generic)
P0E72 Hybrid/EV Battery Internal Isolation Performance
The BMS detects degraded internal isolation between HV bus and battery enclosure. Insulation resistance below safety threshold.
Is it safe to drive with P0E72?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyInternal cell insulation aged
- PossibleInternal moisture
- Less likelyPack cell imbalance approaching service threshold
Symptoms
- EV/hybrid system warning light on
- Reduced power output or limp mode
- Charging may fail or be slowed
- Reduced electric range
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 4–20 h
- Emissions test
- Usually unaffected
- Parts involved
- Hv Battery Pack, Bms, Isolation Monitor
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.