Hybrid/EV Battery Voltage System Isolation Warning
The hybrid control module detects a system-wide isolation warning across multiple HV components. General insulation degradation.
Affected components
- Hv battery
- Hv wiring
- Isolation monitor
Common causes
- High likelihood: Multiple low-grade insulation faults
- Medium likelihood: High ambient humidity affecting multiple components
- Low likelihood: Pack cell imbalance approaching service threshold
Possible symptoms
- EV/hybrid system warning light on
- Reduced power output or limp mode
- Charging may fail or be slowed
- Reduced electric range
Diagnostic notes
- The malfunction indicator lamp may illuminate
- Reduced-power or limp mode may occur
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.