P2600 critical

Coolant Pump Control Circuit Open

The P2600 code means the vehicle's onboard diagnostic system has detected: Coolant Pump Control Circuit Open. This is a critical severity code.

My Garage →

Keep driving?: No -- stop driving
DIY difficulty: hard
Estimated cost: $250 - $800 (parts and labor)

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Common Symptoms

Engine overheating
No coolant circulation
Temperature warning light on
Reduced engine performance

Probable Causes (Ranked by Likelihood)

Failed auxiliary coolant pump motor Very High
Open wiring in coolant pump circuit High
Blown coolant pump control fuse Moderate
ECM pump driver circuit failure Low

Step-by-Step Diagnostic Procedure

Check coolant pump control fuse and relay
Test pump motor for continuity
Inspect wiring from ECM to coolant pump
Verify ECM output signal at pump connector

Frequently Asked Questions

Is P2600 the same as P2500?

They are related but typically refer to different coolant pump circuits. P2600 often relates to the auxiliary or secondary coolant pump used in hybrid or turbocharged vehicles.

Can I drive with P2600?

No. Loss of coolant pump function will cause rapid overheating. Have the vehicle towed to prevent engine damage.

How many coolant pumps does my car have?

Many modern vehicles have two: a mechanical pump driven by the engine and an electric auxiliary pump. P2600 typically refers to the electric auxiliary pump.