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Engine-Codes – GMC – P064C 2018 GMC Sierra

P064C 2018 GMC Sierra Code - Glow Plug Control Module

Quick Answer

The P064C diagnostic trouble code (DTC) for a 2018 GMC Sierra refers to an issue with the Glow Plug Control Module. Common causes include Faulty Glow Plug Control Module: The module itself may be malfunctioning, Wiring issues: Corrosion, damage, or loose connections in the wiring harness can cause communication problems with the Glow Plug Control Module, Glow plug failure: If one or more glow plugs fail, it can affect the operation of the Glow Plug 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
P064C 2018 GMC Sierra indicates Glow Plug Control Module.
Common causes
Common causes include Faulty Glow Plug Control Module: The module itself may be malfunctioning, Wiring issues: Corrosion, damage, or loose connections in the wiring harness can cause communication problems with the Glow Plug Control Module, Glow plug failure: If one or more glow plugs fail, it can affect the operation of the Glow Plug 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.
What is this?
Table of contents Created and updated by William Orellana on Sep 14, 2024
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Code P064C 2018 GMC Sierra Description

The P064C diagnostic trouble code (DTC) for a 2018 GMC Sierra refers to an issue with the Glow Plug Control Module. The Glow Plug Control Module is responsible for managing the glow plugs in a diesel engine, which are essential for starting the engine in cold conditions. When the engine is cold, the glow plugs heat up to help ignite the fuel-air mixture. If the Glow Plug Control Module malfunctions, it can lead to difficulties starting the engine, reduced engine performance, increased emissions, and potential long-term damage to the engine.

OBDII Code P064C 2018 GMC Sierra - Glow Plug Control Module
P064C 2018 GMC Sierra Code - Glow Plug Control Module

Common Causes of P064C 2018 GMC Sierra

  1. Faulty Glow Plug Control Module: The module itself may be malfunctioning.
  2. Wiring issues: Corrosion, damage, or loose connections in the wiring harness can cause communication problems with the Glow Plug Control Module.
  3. Glow plug failure: If one or more glow plugs fail, it can affect the operation of the Glow Plug Control Module.
  4. Software issues: Problems with the software or programming of the module can trigger the P064C code.
  5. Environmental factors: Exposure to extreme temperatures or moisture can damage the Glow Plug Control Module.

Symptoms of P064C 2018 GMC Sierra

  1. Hard starting: The engine may have difficulty starting, especially in cold weather.
  2. Rough idling: The engine may run rough or unevenly at idle.
  3. Decreased fuel efficiency: A malfunctioning Glow Plug Control Module can lead to decreased fuel efficiency.
  4. Check Engine Light: The Check Engine Light may illuminate on the dashboard.
  5. Engine misfires: The engine may misfire due to improper combustion caused by faulty glow plugs.

How to Fix P064C 2018 GMC Sierra

  1. Diagnose the issue: Use a diagnostic scanner to read the code and determine the exact cause of the problem.
  2. Inspect wiring and connections: Check the wiring harness and connections to ensure they are in good condition.
  3. Test glow plugs: Test the glow plugs to see if any are faulty and need replacement.
  4. Replace Glow Plug Control Module: If the module is determined to be faulty, it will need to be replaced with a new one.
  5. Clear the code: After the repair is completed, clear the code and test the vehicle to ensure the issue has been resolved.

Cost to Fix P064C 2018 GMC Sierra

The cost of repairing a Glow Plug Control Module issue can vary depending on the extent of the problem and the specific parts needed. On average, the cost of replacing a Glow Plug Control Module can range from $200 to $500, including parts and labor. However, it's important to note that labor rates at auto repair shops can vary, typically ranging from $80 to $150 per hour. Additionally, the cost may be higher if other components need to be replaced or if the vehicle requires specialized tools for the repair. It's recommended to obtain a detailed estimate from a trusted mechanic or dealership to get an accurate cost for the repair.

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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.

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