AutoCodes – GMC – P064C 2018 GMC Sierra

P064C 2018 GMC Sierra Code - Glow Plug Control Module

Quick Answer

The Glow Plug Control Module has the ability to perform internal self-test diagnostics. Common causes include Faulty Glow Plug Control Module, Glow Plug Control Module harness is open or shorted, Glow Plug 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: P064C 2018 GMC Sierra indicates Glow Plug Control Module.
Common causes: Common causes include Faulty Glow Plug Control Module, Glow Plug Control Module harness is open or shorted, Glow Plug 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 219

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 17, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P064C 2018 GMC Sierra Description

The Glow Plug Control Module has the ability to perform internal self-test diagnostics. If the Glow Plug Control Module detects a failure in any of the internal self-tests it will send a message to the Engine Control Module (ECM) to set this Diagnostic Trouble Code (DTC).

OBDII Code P064C 2018 GMC Sierra - Glow Plug Control Module - AutoCodes.com — P064C 2018 GMC Sierra Code - Glow Plug Control Module

What does this mean?

What are the Possible Causes of the DTC P064C 2018 GMC Sierra?

Faulty Glow Plug Control Module
Glow Plug Control Module harness is open or shorted
Glow Plug Control Module circuit poor electrical connection

How to Fix the DTC P064C 2018 GMC Sierra?

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 P064C 2018 GMC Sierra 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 P064C 2018 GMC Sierra code?

Need more information on how to fix the P064C 2018 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 P064C 2018 GMC Sierra Code

1. What does the OBDII code P064C mean on a 2018 GMC Sierra?

P064C indicates an issue with the Glow Plug Control Module, specifically a performance failure or communication problem with the module.

2. What are the common symptoms of code P064C on a 2018 GMC Sierra?

Symptoms may include difficulty starting the engine in cold weather, the check engine light being illuminated, reduced engine performance, or rough idling.

3. What causes the P064C code to appear on a 2018 GMC Sierra?

Common causes include a faulty Glow Plug Control Module, damaged wiring or connectors, a blown fuse, or issues with the Powertrain Control Module (PCM).

4. Can I drive my 2018 GMC Sierra with the P064C code?

While the vehicle may still be drivable, it could experience reduced performance, especially in cold weather. Prompt diagnosis and repair are recommended to avoid further issues.

5. How do I diagnose the P064C code on a 2018 GMC Sierra?

Start by checking the Glow Plug Control Module for visible damage, inspecting wiring and connectors for corrosion or breaks, and testing the module with a diagnostic tool to confirm proper communication with the PCM.

6. How do I fix the P064C code on a 2018 GMC Sierra?

Repairs may include replacing the Glow Plug Control Module, repairing or replacing damaged wiring or connectors, or reprogramming the PCM if necessary.

7. How much does it cost to repair the P064C code on a 2018 GMC Sierra?

The cost can vary but typically ranges from $200 to $600 depending on labor rates and whether the Glow Plug Control Module or other components need replacement.

8. Can a dead battery cause the P064C code on a 2018 GMC Sierra?

A weak or dead battery can contribute to electrical issues, but the code is more likely caused by specific Glow Plug Control Module problems. Ensure the battery is in good condition to rule it out.

9. Does the P064C code affect fuel efficiency on a 2018 GMC Sierra?

Yes, it can lead to reduced fuel efficiency due to improper combustion during cold starts or poor engine performance.

10. Can I clear the P064C code without fixing the problem on a 2018 GMC Sierra?

Clearing the code without addressing the underlying issue will only temporarily turn off the check engine light. The code will likely return until the problem is resolved.