Engine Coolant Pump Supply Voltage Circuit High
The dedicated supply voltage to the coolant pump module is above operating range. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Affected components
- Smart coolant pump module
- Supply circuit
- Charging system
Common causes
- High likelihood: Alternator regulator failed to limit output
- Low likelihood: Wiring shorted to a higher-voltage circuit
- Low likelihood: Connector pins corroded - high contact resistance
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.