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Engine-Codes – GMC – C0379 GMC

C0379 GMC Code - Front Axle Switch Circuit

Quick Answer

The C0379 GMC code indicates a problem with the front axle switch circuit in the vehicle. Common causes include Faulty front axle switch, Wiring issues or shorts in the circuit, Corrosion or damage to electrical connectors. 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 GMC indicates Front Axle Switch Circuit.
Common causes
Common causes include Faulty front axle switch, Wiring issues or shorts in the circuit, Corrosion or damage to electrical connectors.
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 C0379 GMC Description

The C0379 GMC code indicates a problem with the front axle switch circuit in the vehicle. This switch is responsible for engaging or disengaging the front axle, which is crucial for the operation of the four-wheel drive system. When this circuit malfunctions, it can lead to issues with the vehicle's drivability, especially in off-road or slippery conditions where four-wheel drive is necessary for traction.

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

Common Causes of C0379 GMC

  1. Faulty front axle switch
  2. Wiring issues or shorts in the circuit
  3. Corrosion or damage to electrical connectors
  4. Issues with the front axle actuator
  5. Problems with the transfer case control module

Symptoms of C0379 GMC

  1. Difficulty engaging or disengaging four-wheel drive
  2. Four-wheel drive system not working properly
  3. Dashboard warning light indicating an issue with the front axle
  4. Grinding or clicking noises when switching between two-wheel and four-wheel drive modes

How to Fix C0379 GMC

  1. Begin by conducting a thorough inspection of the front axle switch circuit, checking for any visible damage or loose connections.
  2. Test the front axle switch and wiring using a multimeter to determine if they are functioning correctly.
  3. Replace the front axle switch if it is found to be faulty, ensuring that the new switch is compatible with the vehicle's make and model.
  4. Repair any damaged wiring or connectors in the circuit, making sure to secure all connections properly.
  5. Clear the diagnostic trouble codes from the vehicle's computer and test the four-wheel drive system to ensure that the issue has been resolved.

Cost to Fix C0379 GMC

The typical repair costs for addressing a C0379 GMC code can range from $200 to $500, depending on the extent of the damage and the cost of parts and labor in your area. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate. Keep in mind that rates at dealerships or in metropolitan areas may be higher, while independent shops often offer more competitive pricing.

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Information for Specific GMC Models

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 GMC Code

1. What are the common symptoms of OBDII code C0379 GMC (Front Axle Switch Circuit)?

The common symptoms of code C0379 include the service 4WD light illuminating on the dashboard, difficulty shifting into 4WD mode, or complete loss of 4WD functionality.

2. What are the possible causes of OBDII code C0379 GMC?

Possible causes of code C0379 include a faulty front axle switch, damaged wiring or connectors in the front axle switch circuit, or a malfunctioning transfer case control module.

3. How can I diagnose OBDII code C0379 GMC?

Diagnosing code C0379 typically involves using a scan tool to retrieve the code, checking the front axle switch for proper operation, inspecting the wiring and connectors for damage, and testing the transfer case control module for faults.

4. Can a DIY enthusiast repair OBDII code C0379 GMC?

While some DIY enthusiasts may be able to diagnose and repair code C0379, it is recommended to have a professional technician perform the diagnosis and repair due to the complexity of the electrical components involved.

5. What are the repair options for OBDII code C0379 GMC?

Repair options for code C0379 may include replacing the front axle switch, repairing or replacing damaged wiring or connectors, or reprogramming the transfer case control module.

6. Is it safe to continue driving with OBDII code C0379 GMC?

It is not recommended to continue driving with OBDII code C0379, as it can lead to loss of 4WD functionality, which may affect the vehicle's performance and safety, especially in adverse driving conditions.

7. How much does it typically cost to repair OBDII code C0379 GMC?

The cost of repairing OBDII code C0379 can vary depending on the specific cause of the issue, the cost of parts, and the labor rates of the repair shop. It is advisable to obtain quotes from different repair facilities.

8. Can extreme weather conditions trigger OBDII code C0379 GMC?

Extreme weather conditions such as water exposure or extreme cold can potentially cause damage to the front axle switch or wiring, leading to the triggering of code C0379.

9. Will resetting the OBDII system clear code C0379 GMC?

Resetting the OBDII system may temporarily clear the code, but if the underlying issue causing code C0379 is not addressed, the code is likely to reappear once the system detects the problem again.

10. Can a weak battery cause OBDII code C0379 GMC to trigger?

A weak or failing battery can potentially cause electrical issues that may lead to OBDII code C0379 triggering. It is recommended to ensure the battery is in good condition when diagnosing this code.

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