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Engine-Codes – GMC – P0606 GMC

P0606 GMC Code - Control Module Processor Performance

Quick Answer

The P0606 diagnostic trouble code (DTC) for GMC vehicles indicates an issue with the Engine Control Module (ECM) or Powertrain Control Module (PCM) processor performance. Common causes include Faulty ECM/PCM, Software corruption, Wiring or connector issues. 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
P0606 GMC indicates Control Module Processor Performance.
Common causes
Common causes include Faulty ECM/PCM, Software corruption, Wiring or connector issues.
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.
What is this?
Table of contents Created and updated by William Orellana on Aug 30, 2024
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Code P0606 GMC Description

The P0606 diagnostic trouble code (DTC) for GMC vehicles indicates an issue with the Engine Control Module (ECM) or Powertrain Control Module (PCM) processor performance. The ECM/PCM is a critical component that controls various engine functions, such as fuel injection, ignition timing, and emission controls. When the processor performance is compromised, it can lead to erratic engine behavior, poor performance, and potential safety hazards.

OBDII Code P0606 GMC - Control Module Processor Performance
P0606 GMC Code - Control Module Processor Performance

Common Causes of P0606 GMC

  1. Faulty ECM/PCM
  2. Software corruption
  3. Wiring or connector issues
  4. Electrical interference or shorts
  5. Poor ground connections

Symptoms of P0606 GMC

  1. Check Engine Light illuminated
  2. Engine misfires
  3. Reduced engine power
  4. Poor acceleration
  5. Vehicle may go into "limp mode" to protect the engine

How to Fix P0606 GMC

  1. Perform a thorough diagnosis using a scan tool to confirm the P0606 code and identify the specific ECM/PCM issue.
  2. Inspect wiring harnesses and connectors for any damage or corrosion. Repair or replace as necessary.
  3. Check for any software updates or reprogramming available for the ECM/PCM.
  4. If the ECM/PCM is determined to be faulty, it may need to be replaced and reprogrammed by a professional technician.
  5. Clear the DTC and perform a test drive to ensure the issue has been resolved.

Cost to Fix P0606 GMC

The cost of repairing a P0606 code can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. On average, the repair cost for this type of ECM/PCM performance problem can range from $200 to $800. Keep in mind that additional diagnostic time and parts may be required, so it is recommended to consult with a qualified mechanic for a more accurate estimate based on your vehicle's make and model.

What does this mean?

Tech Notes for P0606 GMC

Check the Powertrain Control Module (PCM) fuse, if the fuse is OK, then try erasing the code first and if the code comes back you may have to reprogram or replace the PCM.

There is a Factory Service Bulletin for the following GMC models:
2010 GMC Savana
2011 GMC Savana
2011 GMC Sierra
GMC Factory Service Bulletin OBDII Code P0606

Need more information about the P0606 GMC code?

Need more information on how to fix the P0606 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0606 GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

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 P0606 GMC Code

1. What are the common symptoms of OBDII code P0606 in a GMC vehicle?

The common symptoms of OBDII code P0606 in a GMC vehicle include engine stalling, rough idling, poor acceleration, and the illumination of the Check Engine light.

2. What are the possible causes of OBDII code P0606 in a GMC vehicle?

Possible causes of OBDII code P0606 in a GMC vehicle include a faulty Engine Control Module (ECM), damaged wiring or connectors, software issues, or a poor electrical connection.

3. How serious is OBDII code P0606 in a GMC vehicle?

OBDII code P0606 in a GMC vehicle should be addressed promptly as it can lead to performance issues and potential long-term damage to the vehicle's engine control system if left unresolved.

4. How can I diagnose OBDII code P0606 in my GMC vehicle?

Diagnosing OBDII code P0606 in a GMC vehicle typically involves using an OBDII scanner to retrieve the specific code, checking for any related symptoms, and inspecting the ECM and its connections for any visible signs of damage.

5. Can I drive my GMC vehicle with OBDII code P0606?

It is not recommended to drive your GMC vehicle with OBDII code P0606 as it can cause further damage to the engine control system and potentially lead to unsafe driving conditions.

6. How can I repair OBDII code P0606 in my GMC vehicle?

Repairing OBDII code P0606 in a GMC vehicle may involve replacing the Engine Control Module (ECM) if it is determined to be faulty, repairing or replacing damaged wiring or connectors, updating the software, or ensuring a proper electrical connection.

7. Can a DIY enthusiast fix OBDII code P0606 in a GMC vehicle?

While some basic troubleshooting steps can be taken by a DIY enthusiast, diagnosing and repairing OBDII code P0606 in a GMC vehicle may require specialized tools and expertise, so it is recommended to consult a professional mechanic.

8. How much does it cost to repair OBDII code P0606 in a GMC vehicle?

The cost to repair OBDII code P0606 in a GMC vehicle can vary depending on the specific cause of the issue, the extent of the damage, and the labor rates of the repair shop. It is advisable to get a few quotes from different mechanics.

9. Are there any preventive measures to avoid OBDII code P0606 in a GMC vehicle?

Regular maintenance, such as keeping the engine control system clean and well-maintained, ensuring proper electrical connections, and promptly addressing any warning signs or symptoms, can help prevent OBDII code P0606 in a GMC vehicle.

10. How long does it take to repair OBDII code P0606 in a GMC vehicle?

The time it takes to repair OBDII code P0606 in a GMC vehicle can vary depending on the specific cause of the issue, the availability of parts, and the workload of the repair shop. It is best to consult with the mechanic for an estimated timeframe.

Discuss the causes and fixes for P0606 GMC OBDII Code

Submit a New Comment

  • where is this part located? inside or outside the vehicle?

    Reply to Comment

  • What model and year is your GMC??

    Reply to Comment

  • I have a 2008 GMC Sierra z71 4x4 1/2 ton. It's throwing this code. Where can I find this and how can I replace it? It is also throwing codes P0641 and P0449. Any help would be greatly appreciated. There's not a dealership in 50 miles that isn't at least 5 days out. I need this pickup in service. Thanks.

    Reply to Comment

  • You may have two different problems. The P0606 and P0641 point to a possible bad Powertrain Control Module (PCM). It may require replace the PCM or reflash get it reflash by the dealer. The P0449 code is for the EVAP system. Follow the link for more information.

    P0449 GMC - Evaporative Emission Vent Valve Solenoid Malfunction
    Read more: https://www.autocodes.com/p04...

    P0641 GMC - 5 Volt Reference Voltage Incorrect
    Read more: https://www.autocodes.com/p06...

    https://www.youtube.com/wat...

    Reply to Comment