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Engine-Codes – GMC – C0379 2014 GMC Sierra

C0379 2014 GMC Sierra Code - Front Axle Switch Circuit

Quick Answer

The C0379 diagnostic trouble code (DTC) for a 2014 GMC Sierra relates to the Front Axle Switch Circuit. Common causes include Faulty front axle switch, Wiring harness issues or electrical connections, Corrosion or damage to the circuit. 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
C0379 2014 GMC Sierra indicates Front Axle Switch Circuit.
Common causes
Common causes include Faulty front axle switch, Wiring harness issues or electrical connections, Corrosion or damage to the circuit.
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 16, 2024
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Code C0379 2014 GMC Sierra Description

The C0379 diagnostic trouble code (DTC) for a 2014 GMC Sierra relates to the Front Axle Switch Circuit. This code indicates a problem with the circuit that controls the front axle engagement in vehicles equipped with four-wheel drive (4WD) or all-wheel drive (AWD) systems. The front axle switch is responsible for activating or deactivating the front axle engagement, allowing the vehicle to switch between 2WD and 4WD modes as needed.

OBDII Code C0379 2014 GMC Sierra - Front Axle Switch Circuit
C0379 2014 GMC Sierra Code - Front Axle Switch Circuit

Common Causes of C0379 2014 GMC Sierra

  1. Faulty front axle switch
  2. Wiring harness issues or electrical connections
  3. Corrosion or damage to the circuit
  4. Defective front axle actuator
  5. Issues with the transfer case control module

Symptoms of C0379 2014 GMC Sierra

  1. Difficulty engaging or disengaging 4WD mode
  2. Dashboard warning light indicating 4WD system malfunction
  3. Grinding or clicking noises when switching between 2WD and 4WD modes
  4. Front axle not engaging or disengaging properly
  5. Reduced traction or stability in slippery or off-road conditions

How to Fix C0379 2014 GMC Sierra

  1. Begin by diagnosing the specific cause of the C0379 code using a scan tool to pinpoint the exact issue with the front axle switch circuit.
  2. Inspect the wiring harness and electrical connections for any signs of damage, corrosion, or loose connections. Repair or replace as necessary.
  3. Test the front axle switch and actuator to ensure they are functioning correctly. Replace any faulty components.
  4. Clear the DTC from the vehicle's computer and test the 4WD system to verify that the front axle engagement is working properly.
  5. If the issue persists, consult a professional technician for further diagnosis and repair.

Cost to Fix C0379 2014 GMC Sierra

The typical repair costs for addressing the C0379 code on a 2014 GMC Sierra can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, replacing a faulty front axle switch or actuator can cost between $200 and $500, including parts and labor. However, additional costs may apply if wiring harness repairs or other components need attention. It's essential to consider the specific diagnosis time and labor rates at auto repair shops, which can range from $80 to $150 per hour. Rates may vary based on location, vehicle make and model, and the complexity of the repair. It's advisable to obtain a detailed estimate from a trusted mechanic to determine the precise cost for resolving the Front Axle Switch Circuit issue.

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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 C0379 2014 GMC Sierra Code

1. What does the OBDII code C0379 mean on a 2014 GMC Sierra?

The code C0379 indicates an issue with the Front Axle Switch Circuit, which controls the engagement of the front axle in the 4WD system.

2. What are the common symptoms of code C0379 on a 2014 GMC Sierra?

Symptoms may include the 4WD system not engaging properly, a service 4WD light on the dashboard, or reduced performance in off-road or slippery conditions.

3. What causes the C0379 code to appear on a 2014 GMC Sierra?

Common causes include a faulty front axle actuator, damaged wiring or connectors in the Front Axle Switch Circuit, or a malfunctioning transfer case control module (TCCM).

4. How do I troubleshoot the C0379 code on my GMC Sierra?

Start by inspecting the wiring and connectors in the Front Axle Switch Circuit for damage or corrosion, then test the front axle actuator and verify the TCCM is functioning correctly.

5. Can I drive my 2014 GMC Sierra with the C0379 code?

Driving is usually possible, but you may lose 4WD functionality, which could impact performance in off-road or slippery conditions.

6. How do I fix the C0379 code on my 2014 GMC Sierra?

Repairs may include replacing the front axle actuator, repairing damaged wiring or connectors, or reprogramming/replacing the TCCM if necessary.

7. How much does it cost to repair the C0379 code on a GMC Sierra?

The cost depends on the exact issue but typically ranges from $100 to $400 for parts and labor, depending on whether the actuator, wiring, or TCCM needs repair or replacement.

8. Can a bad front axle actuator cause the C0379 code?

Yes, a faulty front axle actuator is one of the most common causes of this code.

9. Does the C0379 code require a professional mechanic to fix?

While some issues like checking connectors and wiring can be done by experienced DIYers, diagnosing and replacing components such as the TCCM may require a professional mechanic.

10. Will clearing the C0379 code fix the problem?

Clearing the code will reset the light temporarily, but the underlying issue must be resolved to prevent the code from returning.

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