AutoCodes – Buick – P2601 Buick

P2601 Buick Code - Auxiliary Coolant Pump Performance

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: P2601 Buick indicates Auxiliary Coolant Pump Performance.
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 2,637

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 P2601 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 P2601 Buick - Auxiliary Coolant Pump Performance - AutoCodes.com — P2601 Buick Code - Auxiliary Coolant Pump Performance

What does this mean?

What are the Possible Causes of the DTC P2601 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 P2601 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 P2601 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.

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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 P2601 Buick Code

1. What are the common symptoms of OBDII code P2601 in a Buick related to the Auxiliary Coolant Pump Performance?

- Common symptoms include engine overheating, a check engine light illuminated on the dashboard, and reduced or erratic coolant flow.

2. What are some possible causes of OBDII code P2601 in a Buick?

- Potential causes include a faulty auxiliary coolant pump, a malfunctioning coolant pump control module, wiring issues, or low coolant levels.

3. How can I diagnose the cause of OBDII code P2601 in my Buick?

- Diagnose the issue by checking the coolant pump's electrical connections, testing the pump's functionality, inspecting the wiring for damage, and verifying coolant levels.

4. Can I continue driving my Buick with OBDII code P2601 present?

- It is not recommended to drive the vehicle with this code present, as it can lead to engine overheating and potential damage. It's best to address the issue promptly.

5. How can I repair OBDII code P2601 in a Buick?

- To repair this code, you may need to replace the auxiliary coolant pump, repair any damaged wiring, or replace the coolant pump control module as necessary.

6. Are there any DIY tips for addressing OBDII code P2601 in a Buick?

- While some basic diagnostics can be done at home, it is recommended to consult a professional mechanic for accurate diagnosis and repair of this issue.

7. Is OBDII code P2601 a common problem in Buick vehicles?

- While not extremely common, issues related to the auxiliary coolant pump performance can occur in Buick vehicles, particularly in older models or vehicles with high mileage.

8. Can a faulty auxiliary coolant pump cause other problems in a Buick?

- Yes, a faulty auxiliary coolant pump can lead to engine overheating, potential engine damage, and may cause other cooling system components to malfunction.

9. How much does it typically cost to repair OBDII code P2601 in a Buick?

- Repair costs for this code can vary depending on the specific cause of the issue, but it may range from $200 to $600, including parts and labor.

10. How long does it take to repair OBDII code P2601 in a Buick?

- The repair time can vary based on the exact cause of the code and the extent of the repair needed, but it typically takes a few hours to complete the repair.