Cold Start Engine Coolant Pump Underspeed
During cold start, the engine coolant pump runs below the calibrated minimum speed. Cold viscosity load too high or pump weak.
Affected components
- Engine coolant pump
Common causes
- High likelihood: Cold coolant viscosity too high
- Medium likelihood: Pump output degraded
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.