Hybrid/EV Battery Pack Heater Performance
The HV battery pack heater does not raise battery temperature within the calibrated time window. Heater element aged or supply current insufficient.
Affected components
- Hybrid battery heater
- Battery pack thermal loop
Common causes
- High likelihood: Heater element aged - low output
- Medium likelihood: Supply current insufficient
- 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.