Engine Coolant Pump Clutch Performance/Stuck Off
The coolant pump clutch is commanded on but does not engage. Coolant flow is missing under load, leading to overheating.
Affected components
- Coolant pump clutch
Common causes
- High likelihood: Worn friction surfaces enlarge air gap
- Medium likelihood: Weak solenoid magnetic force
- Low likelihood: Carbon or debris buildup preventing free movement
Possible symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Diagnostic notes
- The malfunction indicator lamp may illuminate
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.