OBD-II code · Powertrain (generic, extended)
P2C88 Hybrid/EV Battery Voltage System Isolation Warning
The hybrid control module detects a system-wide isolation warning across multiple HV components. General insulation degradation.
Is it safe to drive with P2C88?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyMultiple low-grade insulation faults
- PossibleHigh ambient humidity affecting multiple components
- 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
- P2C85Hybrid/EV Battery Voltage External Isolation Fault
- P2C86Hybrid/EV Battery Voltage Internal Isolation Warning
- P2C87Hybrid/EV Battery Voltage External Isolation Warning
- P2C89Hybrid/EV Battery System Precharge Current Too High
- P2C8AHybrid/EV Battery Interface Control Module A Performance
- P2C8BHybrid/EV Battery Interface Control Module B Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.