Engine Coolant Pump Control Circuit / Open
The controller cannot drive the main electric coolant pump. Without flow the engine and aftertreatment will overheat under load.
Affected components
- Engine coolant pump
- Pump relay
- Wiring harness
Common causes
- High likelihood: Open pump motor winding
- Medium likelihood: Broken control wire to the pump
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.