Coolant Pump A Overspeed/Air in System
The coolant pump A runs above the calibrated maximum speed without producing the expected flow. Indicates air pocket in the coolant loop.
Affected components
- Coolant pump a
- Engine coolant loop
Common causes
- High likelihood: Air pocket in coolant loop
- Medium likelihood: Coolant level low
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.