AutoCodes – GMC – P064F GMC

P064F GMC Code - Unauthorized Software/Calibration Detected

Quick Answer

This is an internal fault detection of the transfer case control module. Common causes include Faulty Transfer Case Control Module, Transfer Case Control Module harness is open or shorted, Transfer Case Control Module circuit poor electrical connection. 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 Faulty Transfer Case Control Module, Transfer Case Control Module harness is open or shorted, Transfer Case Control Module circuit poor electrical connection.
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 1,367

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 Jul 16, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P064F GMC Description

This is an internal fault detection of the transfer case control module. This fault is handled inside the transfer case control module. No external circuits are involved.
At each power-up, the transfer case control module runs a self-test on the following:
- EEPROM Checksum
- ROM Checksum
- RAM Checksum
- RAM Malfunction
- Missing, incorrect, or invalid software
The Diagnostic Trouble Code (DTC) will be set when the transfer case control module has detected an invalid calibration.

OBDII Code P064F GMC - Unauthorized Software/Calibration Detected - AutoCodes.com — P064F GMC Code - Unauthorized Software/Calibration Detected

What does this mean?

What are the Possible Causes of the DTC P064F GMC?

Faulty Transfer Case Control Module
Transfer Case Control Module harness is open or shorted
Transfer Case Control Module circuit poor electrical connection

How to Fix the DTC P064F 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 P064F 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 P064F GMC code?

Need more information on how to fix the P064F GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P064F GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P064F 2014 GMC Sierra — Unauthorized Software/Calibration Detected
P064F 2015 GMC Sierra — Unauthorized Software/Calibration Detected
P064F 2016 GMC Sierra — Unauthorized Software/Calibration Detected
P064F 2017 GMC Sierra — Unauthorized Software/Calibration Detected
P064F 2018 GMC Sierra — Unauthorized Software/Calibration Detected

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.