P2603
Coolant Pump A Control Circuit High
P2603 is an OBD-II diagnostic trouble code meaning: Coolant Pump A Control Circuit High. Common causes: coolant pump malfunction, open or short circuit in control circuit. Estimated repair cost: $33–167.
Symptoms
- Engine overheating
- Insufficient engine warm-up
- Check Engine Light Is On
- Unstable engine operation
- Increased fuel consumption
Causes
- Coolant pump malfunction
- Open or short circuit in control circuit
- Pump relay problems
- Engine control unit malfunction
- Oxidation of contacts in connectors
How to Fix
- Check the voltage in the pump control circuit
- Inspect wiring and connectors for damage
- Check the functionality of the coolant pump
- Check pump relay
- If necessary, replace the pump or relay
Related codes
Error P2603 by Vehicle Brand
FAQ
What does the P2603 code mean?
P2603 is an OBD-II diagnostic trouble code that indicates: Coolant Pump A Control Circuit High
What causes a P2603 error code?
The most common causes of P2603 include: Coolant pump malfunction; Open or short circuit in control circuit; Pump relay problems; Engine control unit malfunction.
How do I fix a P2603 diagnostic trouble code?
To fix P2603: Check the voltage in the pump control circuit. Inspect wiring and connectors for damage. Check the functionality of the coolant pump. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P2603?
Limited driving only, diagnose soon
How much does it cost to fix P2603?
The estimated repair cost for P2603 is $33–167. Actual cost depends on your vehicle, location, and labor rates.
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