Cold Start Engine Coolant Pump Overspeed
During cold start, the engine coolant pump exceeds the calibrated maximum speed. Indicates load lost or supply voltage too high.
Affected components
- Engine coolant pump
Common causes
- High likelihood: Pump impeller damaged
- Medium likelihood: Supply voltage above nominal
Diagnostic notes
- The malfunction indicator lamp may illuminate
- A drive cycle may be required after repair
- 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.