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Engine-Codes – GMC – P064F GMC

P064F GMC Code - Unauthorized Software/Calibration Detected

Quick Answer

The P064F diagnostic trouble code (DTC) for GMC vehicles indicates that unauthorized software or calibration has been detected in the vehicle's engine control module (ECM). Common causes include Unauthorized software installation, Incorrect calibration adjustments, Aftermarket tuning modifications. 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
P064F GMC indicates Unauthorized Software/Calibration Detected.
Common causes
Common causes include Unauthorized software installation, Incorrect calibration adjustments, Aftermarket tuning modifications.
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 Sep 08, 2024
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Code P064F GMC Description

The P064F diagnostic trouble code (DTC) for GMC vehicles indicates that unauthorized software or calibration has been detected in the vehicle's engine control module (ECM). This means that the ECM has identified a discrepancy between the software or calibration that it is programmed to run and the actual software or calibration that is currently installed. This can lead to various issues with the vehicle's performance and overall functionality.

OBDII Code P064F GMC - Unauthorized Software/Calibration Detected
P064F GMC Code - Unauthorized Software/Calibration Detected

Common Causes of P064F GMC

  1. Unauthorized software installation
  2. Incorrect calibration adjustments
  3. Aftermarket tuning modifications
  4. ECM software corruption
  5. ECM hardware malfunction

Symptoms of P064F GMC

  1. Check engine light illuminated on the dashboard
  2. Reduced engine performance
  3. Decreased fuel efficiency
  4. Vehicle going into a reduced power mode
  5. Rough idling or stalling

How to Fix P064F GMC

  1. Connect a diagnostic scanner to the vehicle's OBD-II port to retrieve the trouble codes and confirm the presence of P064F.
  2. Check the ECM for any signs of unauthorized software or calibration and revert it back to the original settings if necessary.
  3. Clear the trouble codes and reset the ECM to see if the code reappears.
  4. Perform a software update or reflash on the ECM to ensure it is running the correct software version.
  5. If the issue persists, consider consulting a professional mechanic or dealership for further diagnosis and potential ECM replacement.

Cost to Fix P064F GMC

The typical repair costs for addressing the P064F code can range from $100 to $500, depending on the extent of the issue and whether any parts need to be replaced. This estimate includes labor costs and potential software updates or reprogramming. It is important to note that specific diagnosis time and labor rates at auto repair shops can vary, so it is advisable to check with local providers for a more accurate estimate.

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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 P064F GMC Code

1. What does the OBDII code P064F mean on a GMC?

P064F indicates that the vehicle's control module has detected unauthorized or incompatible software/calibration in the system.

2. What are the common symptoms of the P064F code in a GMC?

Symptoms may include the check engine light turning on, reduced engine performance, or limited functionality of certain vehicle systems.

3. What causes the P064F code to appear on a GMC vehicle?

This code is typically caused by aftermarket tuning, incorrect software updates, or programming errors in the control module.

4. Can the P064F code damage my GMC vehicle?

While the code itself doesn't cause damage, unauthorized calibrations may lead to improper engine management, which could harm components over time.

5. How can I fix the P064F code on my GMC?

The code can often be resolved by reverting to the original factory software or having the control module reprogrammed by a dealership or certified technician.

6. Can I drive my GMC with the P064F code active?

You may be able to drive, but it's not recommended as the vehicle may not perform optimally, and other systems could be affected.

7. Will clearing the P064F code solve the problem?

Clearing the code will not solve the underlying issue; you must address the unauthorized software or calibration for a proper fix.

8. How do I know if my GMC has unauthorized software?

A diagnostic scan at a dealership or trusted repair shop can identify if the software or calibration deviates from factory specifications.

9. Is the P064F code covered under warranty for GMC vehicles?

It depends on the warranty terms and whether the vehicle has been modified. Unauthorized modifications typically void warranty coverage.

10. Can a faulty control module trigger the P064F code on a GMC?

While rare, a malfunctioning control module could potentially misinterpret the software as unauthorized, but this is less common than actual calibration issues.

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