Coolant Pump A Control Circuit High

Where it lives

For P2603, the pump sits on the circuit this code reports. The description of P2603 reports a fault at the pump.

Check these first

• An open in the coolant pump A control circuit
• A coolant pump A that draws no current
• A loose or corroded pump A connector
• A missing ground at coolant pump A

What to do next

1. Read coolant pump A control voltage on a scan tool
2. Test the pump A control circuit for an open
3. Check the pump A connector and ground
4. Measure pump A current draw while commanded
5. Replace coolant pump A if the circuit tests good
6. Clear the code and retest

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