AutoCodes – GMC – P0602 GMC

P0602 GMC Code - Control Module Not Programmed

Quick Answer

This diagnostic applies to internal microprocessor integrity conditions within the Engine Control Module (ECM). Common causes include Low battery voltage, Reprogram Engine Control Module (ECM), Faulty Engine Control Module. 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: P0602 GMC indicates Control Module Not Programmed.
Common causes: Common causes include Low battery voltage, Reprogram Engine Control Module (ECM), Faulty Engine Control Module.
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 11,425

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 Mar 29, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0602 GMC Description

This diagnostic applies to internal microprocessor integrity conditions within the Engine Control Module (ECM). This diagnostic also addresses if the ECM is not programmed. The ECM monitors its ability to read and write to the memory. It also monitors a timing function. No external circuits are involved. The Diagnostic Trouble Code (DTC) will be set when the ECM detects an internal failure or incomplete programming for more than 10 s.

OBDII Code P0602 GMC - Control Module Not Programmed - AutoCodes.com — P0602 GMC Code - Control Module Not Programmed

What does this mean?

What are the Possible Causes of the DTC P0602 GMC?

Low battery voltage
Reprogram Engine Control Module (ECM)
Faulty Engine Control Module
Engine Control Module harness is open or shorted
Engine Control Module circuit poor electrical connection

How to Fix the DTC P0602 GMC?

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 P0602 GMC 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 P0602 GMC code?

Need more information on how to fix the P0602 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0602 GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P0602 2014 GMC Sierra — Control Module Not Programmed
P0602 2015 GMC Sierra — Control Module Not Programmed
P0602 2016 GMC Sierra — Control Module Not Programmed
P0602 2017 GMC Sierra — Control Module Not Programmed
P0602 2018 GMC Sierra — Control Module Not Programmed

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 P0602 GMC Code

1. What does the OBDII code P0602 mean on a GMC vehicle?

P0602 indicates that the control module in your GMC vehicle is not programmed or has incomplete/incorrect programming.

2. What are the common symptoms of the P0602 code in a GMC?

Symptoms may include the check engine light turning on, poor engine performance, reduced fuel efficiency, or issues with starting the vehicle.

3. What causes the P0602 code to appear on a GMC?

The code can be triggered by a control module that has not been programmed correctly, a failed software update, or issues with the module itself, such as internal damage.

4. Can I drive my GMC with the P0602 code active?

Driving with the P0602 code is not recommended, as it may result in poor performance or other drivability issues. Addressing the problem promptly is important.

5. How is the P0602 code diagnosed in a GMC vehicle?

A mechanic will use a scan tool to confirm the code, check the control module's programming status, and inspect for any related wiring or hardware issues.

6. How can I fix the P0602 code on my GMC?

The most common fix is reprogramming or updating the control module with the correct software. In some cases, the module may need to be replaced.

7. Can a dead battery cause the P0602 code on a GMC?

Yes, a dead or weak battery can potentially disrupt the control module's programming and trigger the P0602 code.

8. What tools are needed to fix the P0602 code on a GMC?

A professional-level scan tool or programming device is required to reprogram the control module. In some cases, dealer-specific tools may be necessary.

9. How much does it cost to repair the P0602 code on a GMC?

Repair costs can range from $100 to $300 for reprogramming, while control module replacement can cost $500 or more, depending on the vehicle model.

10. Can I clear the P0602 code on my GMC without fixing it?

Clearing the code without addressing the issue will only result in the code returning. Proper reprogramming or repair is required to resolve the problem.