Hybrid/EV Battery Pack Coolant Pump A Underspeed
The HV battery pack coolant pump A runs below the calibrated minimum speed for the commanded duty. Mechanical resistance high, supply voltage low, or pump aged.
Affected components
- Hybrid battery coolant pump a
- Battery pack coolant loop
Common causes
- High likelihood: Mechanical load increased (binding)
- 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.