P2600Cooling

Coolant Pump Control Circuit / Open

P2600 means the engine control module detected an open or fault in the auxiliary coolant pump control circuit, so the pump may not be commanded on when required.

🚗 Short trips are usually fine, but watch the temperature gauge. A failing auxiliary coolant pump circuit can lead to overheating if the pump does not run when needed.

MEDIUM

severity

🎯 Top Causes, Ranked by Likelihood

#1Open or corroded coolant pump wiring$100-$350

40%

Broken or corroded wires or a bad connector open the control circuit.

#2Failed auxiliary coolant pump$150-$600

35%

The electric coolant pump itself has failed internally.

#3Blown fuse or relay$20-$120

15%

A fuse or relay feeding the pump has failed.

#4Faulty ECM driver$500-$1200

10%

The control module output that drives the pump has failed.

🩺 Common Symptoms

Check engine light
Engine running warmer than normal
Coolant pump not running
Poor cabin heat in some vehicles

💰 Repair Cost: DIY vs Shop

DIY Cost

$50-$400

Shop Cost

$200-$800

📋 Free OBD2 Code Cheat Sheet

The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.

🔧 How to Diagnose P2600

1Inspect the coolant pump connector and wiring for damage or corrosion

2Check the pump fuse and relay

3Test the pump by applying power directly to confirm it runs

4Verify the ECM commands the pump with a scan tool

❓ Frequently Asked Questions

Can I drive with P2600?

Yes for short trips, but monitor engine temperature. Overheating from a non-running pump can cause serious damage.

How much to fix P2600?

Wiring repairs can be under $200; a replacement pump usually runs $200-$700 at a shop.

Is P2600 the main water pump?

Usually not. It refers to an electric auxiliary or coolant circulation pump, not the belt-driven main water pump.

🔗 Related Codes

P2601P2602P2603P0480