AutoCodes – Chevrolet – P2602 Chevrolet

P2602 Chevrolet 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 Chevrolet 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 2,068

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

What does this mean?

What are the Possible Causes of the DTC P2602 Chevrolet?

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 Chevrolet?

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 Chevrolet 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 Chevrolet Code

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

- Common symptoms include poor engine performance, overheating, and a possible check engine light.

2. What are the possible causes of the Auxiliary Coolant Pump Circuit Low code P2602 on a Chevrolet?

- Causes can include a faulty auxiliary coolant pump, damaged wiring or connectors, low coolant levels, or a malfunctioning coolant temperature sensor.

3. How can I diagnose the issue causing OBDII code P2602 on my Chevrolet?

- You can start by checking the coolant level, inspecting the wiring and connectors for damage, testing the auxiliary coolant pump, and verifying the operation of the coolant temperature sensor.

4. Can I continue driving my Chevrolet with OBDII code P2602 present?

- It is not recommended to continue driving with this code active, as it can lead to engine overheating and potential damage.

5. How can I repair OBDII code P2602 on my Chevrolet?

- Repair options may include replacing the auxiliary coolant pump, repairing any damaged wiring or connectors, ensuring proper coolant levels, and addressing any issues with the coolant temperature sensor.

6. Are there any DIY tips for troubleshooting OBDII code P2602 on my Chevrolet?

- DIY tips may include checking and topping up coolant levels, visually inspecting wiring for damage, and ensuring all connections are secure.

7. What is the role of the auxiliary coolant pump in a Chevrolet vehicle?

- The auxiliary coolant pump helps circulate coolant through the engine to maintain optimal operating temperature, especially during low-speed or idle conditions.

8. Can a malfunctioning auxiliary coolant pump affect other systems in my Chevrolet?

- Yes, a malfunctioning auxiliary coolant pump can lead to engine overheating, poor cabin heating, and potential damage to engine components.

9. Is it necessary to reset the OBDII code P2602 after repairing the issue on my Chevrolet?

- Yes, it is recommended to clear the code after addressing the underlying problem to ensure the check engine light does not reappear.

10. How can I prevent OBDII code P2602 from reoccurring on my Chevrolet in the future?

- Regular maintenance, such as checking coolant levels, inspecting wiring periodically, and addressing any cooling system issues promptly, can help prevent the reoccurrence of this code.