AutoCodes – Cadillac – P2602 Cadillac

P2602 Cadillac Code - Auxiliary Coolant Pump Circuit Low

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: P2602 Cadillac indicates Auxiliary Coolant Pump Circuit Low.
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 2,167

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 P2602 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 P2602 Cadillac - Auxiliary Coolant Pump Circuit Low - AutoCodes.com — P2602 Cadillac Code - Auxiliary Coolant Pump Circuit Low

What does this mean?

What are the Possible Causes of the DTC P2602 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 P2602 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 P2602 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 P2602 Cadillac Code

1. What are the common symptoms of OBDII code P2602 in a Cadillac related to the Auxiliary Coolant Pump Circuit Low?

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

2. What are the possible causes of the P2602 code in a Cadillac?

Possible causes of the P2602 code can include a faulty auxiliary coolant pump, damaged wiring or connectors in the coolant pump circuit, or a malfunctioning coolant temperature sensor.

3. How can I diagnose the issue causing the P2602 code in my Cadillac?

Diagnosing the issue involves checking the auxiliary coolant pump for proper operation, inspecting the wiring and connectors for damage, and testing the coolant temperature sensor for accuracy.

4. Can driving with the P2602 code present cause further damage to my Cadillac?

Continuing to drive with the P2602 code present can lead to engine overheating and potential damage, so it is recommended to address the issue promptly.

5. How can I repair the Auxiliary Coolant Pump Circuit Low issue in my Cadillac?

Repairing the issue may involve replacing the faulty auxiliary coolant pump, repairing or replacing damaged wiring or connectors, or addressing any issues with the coolant temperature sensor.

6. Is it possible to reset the P2602 code in a Cadillac without fixing the underlying issue?

Resetting the code without addressing the underlying problem may temporarily turn off the check engine light, but the issue causing the code will likely persist and trigger the code again.

7. Can a DIY enthusiast fix the P2602 code issue in a Cadillac?

Depending on the individual's skill level and access to tools, a DIY enthusiast may be able to address the P2602 code by following diagnostic procedures and making necessary repairs.

8. Is it necessary to visit a mechanic for the P2602 code issue in a Cadillac?

While some drivers may attempt to address the P2602 code themselves, consulting a mechanic or automotive technician is recommended for a thorough diagnosis and proper repair of the issue.

9. Are there any preventive measures to avoid the recurrence of the P2602 code in a Cadillac?

Regular maintenance, such as checking the coolant system for leaks and ensuring proper coolant levels, can help prevent issues that may trigger the P2602 code.

10. How long does it typically take to repair the P2602 code issue in a Cadillac?

The time required to repair the P2602 code can vary based on the specific cause of the issue and the complexity of the repair, so it is advisable to consult with a professional for an accurate estimate.