Hybrid/EV Battery Pack Coolant Pump A Performance
The hybrid control module detects that battery pack coolant pump A does not produce the expected flow for the commanded duty. Battery thermal management may be impaired.
Affected components
- Hybrid battery coolant pump a
- Battery pack
- Hybrid control module
Common causes
- High likelihood: Pump output degraded with age
- Medium likelihood: Air pocket in coolant loop
- 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.