Coolant Pump A Underspeed
The coolant pump A runs below the calibrated minimum speed for the commanded duty. Mechanical resistance high or supply voltage low.
Affected components
- Coolant pump a
- Ecm
Common causes
- High likelihood: Mechanical load increased (binding)
- Medium likelihood: Supply voltage low under load
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.