AutoCodes – Buick – P2600 Buick

P2600 Buick Code - Auxiliary Coolant Pump Circuit/Open

Quick Answer

The auxiliary coolant pump and cooling fan system provides a measure of prevention against fuel vaporization due to excessive engine temperatures. Common causes include Faulty Auxiliary Coolant Pump Relay, Blocked pump control passage, Faulty Auxiliary Coolant Pump. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P2600 Buick indicates Auxiliary Coolant Pump Circuit/Open.
Common causes: Common causes include Faulty Auxiliary Coolant Pump Relay, Blocked pump control passage, Faulty Auxiliary Coolant Pump.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 1,503

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jan 19, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2600 Buick Description

The auxiliary coolant pump and cooling fan system provides a measure of prevention against fuel vaporization due to excessive engine temperatures. The Engine Control Module (ECM) commands the auxiliary or after boil coolant pump ON when the engine coolant temperature exceeds a calibrated value after engine shut down. The ECM applies ground to the coil side of the auxiliary pump relay. This energizes the coil and applies voltage directly to the pump motor through the switch side of the relay. When the auxiliary coolant pump is activated, coolant is drawn from radiator and pumped into the engine through a tee in the engine coolant inlet pipe. As the colder temperature coolant is drawn into the engine warmer coolant is expelled from the engine and back to the radiator. Removing high temperature coolant from the engine after shut down helps prevent vaporization of the fuel that remains in the fuel injectors and fuel rail during a hot soak.

OBDII Code P2600 Buick - Auxiliary Coolant Pump Circuit/Open - AutoCodes.com — P2600 Buick Code - Auxiliary Coolant Pump Circuit/Open

What does this mean?

What are the Possible Causes of the DTC P2600 Buick?

Faulty Auxiliary Coolant Pump Relay
Blocked pump control passage
Faulty Auxiliary Coolant Pump
Auxiliary Coolant Pump harness is open or shorted
Auxiliary Coolant Pump circuit poor electrical connection

How to Fix the DTC P2600 Buick?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2600 Buick code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P2600 Buick code?

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Need Help with the Code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P2600 Buick Code

1. What are common symptoms of OBDII code P2600 in a Buick related to the Auxiliary Coolant Pump Circuit/Open?

- Common symptoms include engine overheating, poor heater performance, and illuminated coolant warning lights on the dashboard.

2. What are the possible causes of the OBDII code P2600 in a Buick?

- Possible causes include a malfunctioning auxiliary coolant pump, damaged wiring or connectors in the coolant pump circuit, or a faulty coolant pump relay.

3. How can I diagnose the OBDII code P2600 in my Buick related to the Auxiliary Coolant Pump Circuit/Open?

- Diagnosis involves checking the condition of the auxiliary coolant pump, inspecting the wiring for any damage, testing the coolant pump relay, and using a diagnostic scanner to read the trouble codes.

4. Can I continue driving my Buick with the OBDII code P2600 without addressing the issue?

- It is not recommended to continue driving with this code as it can lead to engine overheating and potential damage if the auxiliary coolant pump is not functioning properly.

5. How can I repair the OBDII code P2600 in my Buick related to the Auxiliary Coolant Pump Circuit/Open?

- Repair options include replacing the faulty auxiliary coolant pump, repairing or replacing damaged wiring or connectors, and replacing the coolant pump relay if necessary.

6. Is it possible to reset the OBDII code P2600 in my Buick without fixing the underlying issue?

- While you can clear the code using a diagnostic scanner, it is important to address the root cause of the problem to prevent further issues with the cooling system.

7. Are there any preventive maintenance tips to avoid encountering the OBDII code P2600 in a Buick?

- Regularly inspecting and maintaining the cooling system, including checking the auxiliary coolant pump and its components, can help prevent issues that trigger this trouble code.

8. Can weather conditions impact the occurrence of the OBDII code P2600 in a Buick?

- Extreme weather conditions can potentially affect the performance of the auxiliary coolant pump, leading to issues that trigger the code, especially in very hot or very cold climates.

9. How long does it typically take to repair the OBDII code P2600 in a Buick related to the Auxiliary Coolant Pump Circuit/Open?

- The repair time can vary depending on the exact cause of the issue, but it may take anywhere from a few hours to a full day to address and fix the problem correctly.

10. Is it necessary to visit a mechanic to repair the OBDII code P2600 in a Buick, or can I fix it myself?

- The complexity of the repair and diagnosis may require professional expertise, but if you have the necessary tools and experience with automotive repairs, you may be able to address the issue yourself.