AutoCodes – Cadillac – P2600 Cadillac

P2600 Cadillac 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 Cadillac 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 2,729

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

What does this mean?

What are the Possible Causes of the DTC P2600 Cadillac?

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 Cadillac?

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 Cadillac 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 P2600 Cadillac Code

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

The common symptoms include poor engine performance, overheating, and the illumination of the check engine light.

2. What are the typical causes of the OBDII code P2600 in a Cadillac?

The code P2600 in a Cadillac is usually caused by a faulty auxiliary coolant pump, damaged wiring or connectors, or a blown fuse related to the coolant pump circuit.

3. How can I diagnose the OBDII code P2600 in my Cadillac?

Diagnosing the code P2600 involves checking the auxiliary coolant pump for proper operation, inspecting the wiring and connectors for damage, and testing the related fuses for continuity.

4. Can I still drive my Cadillac with the OBDII code P2600 present?

It is not recommended to drive your Cadillac with the code P2600 present, as it can lead to overheating and potential engine damage. It is best to address the issue promptly.

5. What are some repair tips for fixing the OBDII code P2600 in a Cadillac?

Repair tips include checking and replacing the auxiliary coolant pump if necessary, repairing any damaged wiring or connectors, and ensuring that the fuses related to the coolant pump circuit are in good condition.

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

While clearing the code may temporarily turn off the check engine light, it is important to address the root cause of the problem to prevent further issues.

7. Can a DIY enthusiast fix the OBDII code P2600 in a Cadillac?

Depending on your skill level and access to tools, some DIY enthusiasts may be able to address the code P2600 by following repair guides and using diagnostic tools to pinpoint the issue.

8. How much does it typically cost to repair the OBDII code P2600 in a Cadillac at a dealership or repair shop?

The cost of repairing the code P2600 can vary depending on the extent of the issue, but it may involve parts and labor costs ranging from $200 to $500 or more at a dealership or repair shop.

9. Will fixing the OBDII code P2600 improve the overall performance and efficiency of my Cadillac?

Yes, addressing the code P2600 and ensuring proper operation of the auxiliary coolant pump can help improve engine performance, prevent overheating, and maintain the efficiency of your Cadillac.

10. How often does the OBDII code P2600 related to the Auxiliary Coolant Pump Circuit/Open occur in Cadillacs?

While the frequency may vary, the OBDII code P2600 related to the Auxiliary Coolant Pump Circuit/Open can occur in Cadillacs with aging components or electrical issues, requiring timely diagnosis and repair.