Coolant Pump Control Circuit Open
The ECU detects an open circuit on the electric coolant pump control line. Without pump control the engine cannot actively manage warm-up and cool-down phases.
Affected components
- Electric coolant pump
- Coolant pump wiring
Common causes
- High likelihood: Pump motor open
- Medium likelihood: Drive line open
- Low likelihood: Pin pushed back out of connector body
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
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.