OBD-II code · Powertrain (generic, extended)
P2C86 Hybrid/EV Battery Voltage Internal Isolation Warning
The hybrid control module detects an internal isolation warning inside the high-voltage battery pack. Pre-failure indicator for cell or busbar insulation.
Is it safe to drive with P2C86?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyCell insulation aged
- PossibleBusbar approaching housing
- 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
- 3–16 h
- Emissions test
- Usually unaffected
- Parts involved
- Hv Battery, Hv Wiring, Isolation Monitor
Related codes
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.