Engine Coolant Pump Clutch Control Circuit / Open
The mechanical clutch on a belt-driven coolant pump (used to disengage the pump for fast warm-up) cannot be driven. Pump always engaged so warm-up takes longer.
Affected components
- Coolant pump clutch
- Clutch solenoid
- Wiring harness
Common causes
- High likelihood: Open coil in clutch solenoid
- Medium likelihood: Broken control wire
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.