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C0379 2018 Chevrolet Silverado Code - Front Axle Switch Circuit

Quick Answer

The C0379 diagnostic trouble code (DTC) for the 2018 Chevrolet Silverado relates to the Front Axle Switch Circuit. Common causes include Faulty front axle switch, Damaged wiring or connectors in the front axle switch circuit, Corrosion or debris affecting the electrical connections. 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 2018 Chevrolet Silverado indicates Front Axle Switch Circuit.
Common causes
Common causes include Faulty front axle switch, Damaged wiring or connectors in the front axle switch circuit, Corrosion or debris affecting the electrical connections.
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 2018 Chevrolet Silverado Description

The C0379 diagnostic trouble code (DTC) for the 2018 Chevrolet Silverado relates to the Front Axle Switch Circuit. This code indicates a problem with the electrical circuit that controls the front axle engagement system in the vehicle. The front axle switch is responsible for engaging and disengaging the front axle, which is crucial for the vehicle's four-wheel drive system to function properly. When this circuit malfunctions, it can lead to issues with the vehicle's drivability and overall performance.

OBDII Code C0379 2018 Chevrolet Silverado - Front Axle Switch Circuit
C0379 2018 Chevrolet Silverado Code - Front Axle Switch Circuit

Common Causes of C0379 2018 Chevrolet Silverado

  1. Faulty front axle switch
  2. Damaged wiring or connectors in the front axle switch circuit
  3. Corrosion or debris affecting the electrical connections
  4. Defective front axle actuator
  5. Issues with the transfer case control module

Symptoms of C0379 2018 Chevrolet Silverado

  1. Difficulty engaging or disengaging four-wheel drive
  2. Illumination of the 4WD warning light on the dashboard
  3. Unusual noises coming from the front axle area
  4. Reduced traction and stability while driving in four-wheel drive mode
  5. Inability to switch between two-wheel drive and four-wheel drive modes

How to Fix C0379 2018 Chevrolet Silverado

  1. Begin by conducting a thorough inspection of the front axle switch circuit, including the switch itself, wiring, and connectors.
  2. Test the front axle switch for proper functionality using a multimeter to check for continuity and resistance.
  3. Inspect the front axle actuator for any signs of damage or malfunction and replace if necessary.
  4. Clear the DTC from the vehicle's onboard computer using a diagnostic scan tool.
  5. Test drive the vehicle to ensure that the front axle switch circuit is operating correctly and that the four-wheel drive system engages and disengages as intended.

Cost to Fix C0379 2018 Chevrolet Silverado

The typical repair costs for addressing the C0379 DTC on a 2018 Chevrolet Silverado can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the cost of parts for this repair can range from $100 to $300, while labor costs may range from $150 to $400. Overall, the total repair cost for this issue could fall between $250 and $700. It is important to note that these estimates are approximate and can vary based on factors such as location, labor rates, and the availability of parts. It is advisable to consult with a qualified mechanic or repair shop to obtain a more accurate cost estimate for addressing the Front Axle Switch Circuit issue on a 2018 Chevrolet Silverado.

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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 2018 Chevrolet Silverado Code

1. What does the OBDII code C0379 mean on a 2018 Chevrolet Silverado?

C0379 indicates an issue with the Front Axle Switch Circuit, which is responsible for engaging or disengaging the front axle in four-wheel-drive (4WD) systems.

2. What are the common symptoms of code C0379 in a 2018 Chevrolet Silverado?

Symptoms may include the 4WD system not engaging or disengaging properly, a Service 4WD message on the dashboard, or unusual noises from the front axle.

3. What causes the C0379 code on a 2018 Chevrolet Silverado?

Common causes include a faulty front axle actuator, damaged wiring or connectors in the switch circuit, or an issue with the transfer case control module (TCCM).

4. How can I diagnose the C0379 code on my 2018 Chevrolet Silverado?

Start by inspecting the wiring and connectors for damage or corrosion. Use a scan tool to monitor the TCCM's data and verify the operation of the front axle actuator.

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

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

6. Is it safe to drive a 2018 Chevrolet Silverado with the C0379 code?

While the vehicle may still be drivable in 2WD mode, you could experience issues with 4WD functionality, which may be critical in certain driving conditions.

7. How do I fix the C0379 code on a 2018 Chevrolet Silverado?

Repair typically involves replacing the front axle actuator, repairing damaged wiring or connectors, or reprogramming the TCCM if necessary.

8. How much does it cost to fix the C0379 code on a 2018 Chevrolet Silverado?

Costs can vary but typically range from $150 to $500, depending on whether the actuator, wiring, or module needs repair or replacement.

9. Can a blown fuse cause the C0379 code on a 2018 Chevrolet Silverado?

Yes, a blown fuse in the circuit powering the front axle actuator could cause this code.

10. Will clearing the C0379 code solve the problem on my 2018 Chevrolet Silverado?

Clearing the code will turn off the warning temporarily, but the issue will recur until the underlying problem is resolved.

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