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Engine-Codes – GMC – P064C 2014 GMC Sierra

P064C 2014 GMC Sierra Code - Glow Plug Control Module

Quick Answer

The P064C diagnostic trouble code (DTC) in a 2014 GMC Sierra indicates a problem with the Glow Plug Control Module. Common causes include Faulty Glow Plug Control Module, Electrical wiring issues, Corrosion or poor connections in the electrical system. 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 2014 GMC Sierra indicates Glow Plug Control Module.
Common causes
Common causes include Faulty Glow Plug Control Module, Electrical wiring issues, Corrosion or poor connections in the electrical system.
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 17, 2024
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Code P064C 2014 GMC Sierra Description

The P064C diagnostic trouble code (DTC) in a 2014 GMC Sierra indicates a problem 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 cold starts by preheating the combustion chamber. When this module malfunctions, it can lead to issues with starting the engine, reduced fuel efficiency, and increased emissions.

OBDII Code P064C 2014 GMC Sierra - Glow Plug Control Module
P064C 2014 GMC Sierra Code - Glow Plug Control Module

Common Causes of P064C 2014 GMC Sierra

  1. Faulty Glow Plug Control Module
  2. Electrical wiring issues
  3. Corrosion or poor connections in the electrical system
  4. Defective glow plugs
  5. Software issues in the control module

Symptoms of P064C 2014 GMC Sierra

  1. Difficulty starting the engine, especially in cold weather
  2. Reduced fuel efficiency
  3. Increased emissions
  4. Engine misfires
  5. Illumination of the check engine light

How to Fix P064C 2014 GMC Sierra

  1. Diagnose the issue using a scan tool to confirm the P064C code and pinpoint the exact cause of the problem.
  2. Inspect the wiring and connections related to the Glow Plug Control Module for any damage or corrosion.
  3. Test the glow plugs to ensure they are functioning properly.
  4. Replace the Glow Plug Control Module if it is found to be faulty.
  5. Clear the DTC and test the vehicle to ensure the issue has been resolved.

Cost to Fix P064C 2014 GMC Sierra

The cost of repairing a Glow Plug Control Module issue can vary depending on the specific cause of the problem and the labor rates in your area. On average, you can expect to pay between $200 and $500 for parts and labor. Keep in mind that rates at auto repair shops can vary, so it's best to get a few quotes before proceeding with 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 2014 GMC Sierra Code

1. What does the OBDII code P064C mean on a 2014 GMC Sierra?

The P064C code indicates a malfunction in the Glow Plug Control Module, which is responsible for managing the glow plugs used to help start the engine in cold conditions.

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

Symptoms may include difficulty starting the engine in cold weather, rough idling, reduced fuel efficiency, and the illumination of the check engine light.

3. What causes the P064C code to appear on a 2014 GMC Sierra?

Common causes include a faulty Glow Plug Control Module, damaged wiring or connectors, blown fuses, or issues with the powertrain control module (PCM).

4. Can I drive my 2014 GMC Sierra with a P064C code?

While the vehicle may still be drivable, you could experience cold-start issues, and ignoring the code can lead to further damage over time.

5. How do you diagnose the P064C code in a GMC Sierra?

Diagnosis involves scanning for codes, inspecting the wiring and connectors for damage, testing the Glow Plug Control Module, and verifying the voltage supply and ground connections.

6. How do you fix the P064C code on a 2014 GMC Sierra?

Repairs may include replacing the Glow Plug Control Module, repairing damaged wiring or connectors, replacing blown fuses, or reprogramming/updating the PCM if needed.

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

Repair costs can vary but typically range from $200 to $600 depending on whether the Glow Plug Control Module needs replacement or if the issue is related to wiring.

8. Can a bad glow plug cause the P064C code?

No, the P064C code specifically relates to the Glow Plug Control Module malfunction, not individual glow plugs, though related issues may coexist.

9. Do I need to replace the Glow Plug Control Module to clear the P064C code?

Not always. Sometimes, the issue can be resolved by repairing damaged wiring, replacing a fuse, or addressing a software issue.

10. Will clearing the code with a scan tool fix the P064C problem?

No, clearing the code will only reset the check engine light temporarily. The underlying issue must be diagnosed and repaired to prevent the code from returning.

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