Coolant Pump B Control Circuit High
Voltage on the second coolant pump control line is above the expected window. Typical causes are a short to battery or an open motor winding.
Affected components
- Coolant pump b
- Wiring harness
Common causes
- High likelihood: Control wire shorted to B+
- Medium likelihood: Open motor winding
- Low likelihood: Connector pins corroded - high contact resistance
Diagnostic notes
- The malfunction indicator lamp may illuminate
Related codes
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.