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Engine-Codes – Generic – C0379

C0379 Code - Front Axle Switch Circuit

Quick Answer

The C0379 diagnostic trouble code (DTC) relates to the Front Axle Switch Circuit in a vehicle. Common causes include Faulty front axle switch, Damaged wiring or connectors in the circuit, Corrosion or moisture intrusion in the switch or wiring. 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 indicates Front Axle Switch Circuit.
Common causes
Common causes include Faulty front axle switch, Damaged wiring or connectors in the circuit, Corrosion or moisture intrusion in the switch or wiring.
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 11, 2024
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Code C0379 Description

The C0379 diagnostic trouble code (DTC) relates to the Front Axle Switch Circuit in a vehicle. This code typically indicates a problem with the electronic control system that manages the engagement and disengagement of the front axle in four-wheel-drive (4WD) or all-wheel-drive (AWD) vehicles. The front axle switch is responsible for sending signals to the vehicle's computer to engage or disengage the front axle depending on driving conditions.

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

Common Causes of C0379

  1. Faulty front axle switch
  2. Damaged wiring or connectors in the circuit
  3. Corrosion or moisture intrusion in the switch or wiring
  4. Electronic control module (ECM) malfunction
  5. Mechanical issue with the front axle engagement mechanism

Symptoms of C0379

  1. Illuminated 4WD or AWD warning light on the dashboard
  2. Difficulty engaging or disengaging 4WD or AWD mode
  3. Unusual noises coming from the front axle area
  4. Reduced traction or stability on slippery roads or off-road terrain
  5. Increased steering effort or difficulty maneuvering the vehicle

How to Fix C0379

  1. Begin by conducting a thorough inspection of the front axle switch circuit, including the switch, wiring, and connectors, to identify any visible damage or corrosion.
  2. Test the front axle switch using a multimeter to check for continuity and proper operation. Replace the switch if it fails the test.
  3. Inspect the wiring harness for any breaks, fraying, or damage. Repair or replace any faulty wiring as needed.
  4. Check the electronic control module (ECM) for any error codes related to the front axle switch circuit. Reset the codes and retest the system after repairs.
  5. Test drive the vehicle to confirm that the 4WD or AWD system is functioning correctly after the repairs.

Cost to Fix C0379

The cost of repairing the Front Axle Switch Circuit issue can vary depending on the specific vehicle make and model, the extent of the damage, and the labor rates at the auto repair shop. On average, the parts for this repair may range from $100 to $300, while labor costs can amount to $150 to $300. Overall, the total cost of resolving the C0379 code may fall between $250 and $600, but it's advisable to obtain a detailed quote from a reputable mechanic based on your vehicle's requirements. Keep in mind that additional diagnostic time and any necessary replacement parts may affect the final cost of the repair.

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Code C0379 Information for Specific Makes

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 Code

1. What are common symptoms of OBDII code C0379 - Front Axle Switch Circuit?

The common symptoms include difficulty shifting between two-wheel drive and four-wheel drive modes, the vehicle getting stuck in one drive mode, and warning lights on the dashboard.

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

The code C0379 can be triggered by issues such as a faulty front axle switch, damaged wiring or connectors in the circuit, a defective transfer case control module, or a malfunctioning front axle actuator.

3. How can I diagnose the Front Axle Switch Circuit issue related to OBDII code C0379?

Diagnosing the issue involves checking the front axle switch for proper operation, inspecting the wiring and connectors for any damage, testing the front axle actuator, and scanning the transfer case control module for error codes.

4. How can I repair OBDII code C0379 - Front Axle Switch Circuit?

Repairing the code C0379 may involve replacing the front axle switch, repairing or replacing damaged wiring or connectors, replacing the front axle actuator if necessary, or reprogramming the transfer case control module.

5. Can I drive my vehicle with OBDII code C0379 present?

It is not recommended to drive the vehicle with the code C0379 active, as it can affect the proper functioning of the four-wheel drive system and potentially lead to further damage if left unresolved.

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

The cost of repairing OBDII code C0379 can vary depending on the specific cause of the issue, but it may range from $200 to $600, including parts and labor.

7. Will resetting the OBDII system clear the C0379 code?

Resetting the OBDII system may temporarily clear the code C0379, but if the underlying issue is not addressed, the code is likely to reappear once the problem is detected again by the vehicle's system.

8. Can a DIY enthusiast fix OBDII code C0379 at home?

While some aspects of diagnosing and repairing OBDII code C0379 can be done by a knowledgeable DIY enthusiast, it is recommended to seek professional assistance, especially when dealing with electrical components and complex systems.

9. How long does it take to repair OBDII code C0379?

The repair time for OBDII code C0379 can vary depending on the exact cause of the issue and the extent of the repairs needed. In general, it may take a few hours to a full day to complete the repair.

10. Is it important to address OBDII code C0379 promptly?

Yes, it is essential to address OBDII code C0379 promptly to ensure the proper functioning of the four-wheel drive system and prevent potential safety hazards or further damage to the vehicle's components.

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