P2603

Coolant Pump A Control Circuit High

Severity

🔴 High

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$33–167 (est.)

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

P2600 P2601 P2602