Hybrid/EV Battery Pack Coolant Heater B Control Performance
The HV battery pack coolant heater B reports a control performance condition. Battery preheating may be impaired in cold weather.
Affected components
- Hv battery pack coolant heater b
- Wiring harness
- Bms
Common causes
- High likelihood: Heater element aged - low output
- Medium likelihood: Supply voltage low under load
- 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
Related codes
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.