Engine Coolant Pump Supply Voltage Circuit Low
The dedicated supply voltage to the coolant pump module is below 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
- Battery
Common causes
- High likelihood: High-resistance battery feed
- Medium likelihood: Weak battery sags under pump current
- 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.