C0379 2015 GMC Sierra Code - Front Axle Switch Circuit
Quick Answer
The front axle control circuit consists of an electric motor actuator that engages and disengages the front axle. Common causes include Faulty Front Axle Engagement Actuator, Front Axle Engagement Actuator harness is open or shorted, Front Axle Engagement Actuator circuit poor electrical connection. 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 2015 GMC Sierra indicates Front Axle Switch Circuit.
- Common causes
- Common causes include Faulty Front Axle Engagement Actuator, Front Axle Engagement Actuator harness is open or shorted, Front Axle Engagement Actuator circuit poor electrical connection.
- 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.
Code C0379 2015 GMC Sierra Description
The front axle engagement actuator contains the following circuits: A Run/Crank Ignition 1 Voltage circuit, a Four-Wheel Drive Wheel Lock Indicator circuit, a Front Axle Actuator Control circuit, and a ground circuit.
When a shift to 4WD Auto, 4WD High, or 4WD Low is requested, the Transfer Case Control Module engages the front axle by grounding the front axle actuator control circuit through a current limiting driver.
This Diagnostic Trouble Code (DTC) will be set when a short to ground, short to voltage, or open circuit is detected.
What are the Possible Causes of the DTC C0379 2015 GMC Sierra?
- Faulty Front Axle Engagement Actuator
- Front Axle Engagement Actuator harness is open or shorted
- Front Axle Engagement Actuator circuit poor electrical connection
- Faulty Transfer Case Control Module
How to Fix the DTC C0379 2015 GMC Sierra?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the C0379 2015 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the C0379 2015 GMC Sierra code?
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Frequently Asked Questions about C0379 2015 GMC Sierra Code
1. What does OBDII code C0379 for a 2015 GMC Sierra Front Axle Switch Circuit indicate?
The code C0379 indicates a problem with the front axle switch circuit in a 2015 GMC Sierra, potentially related to the engagement or disengagement of the front axle.
2. What are the common symptoms of OBDII code C0379 in a 2015 GMC Sierra?
Common symptoms of code C0379 may include difficulty engaging or disengaging 4WD, flashing 4WD indicator lights, or complete failure of the 4WD system in the GMC Sierra.
3. What are the possible causes of OBDII code C0379 in a 2015 GMC Sierra?
Possible causes of code C0379 can include a faulty front axle switch, damaged wiring or connectors in the circuit, or issues with the front axle actuator itself in the 2015 GMC Sierra.
4. How can I diagnose the Front Axle Switch Circuit issue causing OBDII code C0379 in my 2015 GMC Sierra?
Diagnosing the C0379 code may involve inspecting the front axle switch, testing the wiring and connectors for continuity, and checking the front axle actuator for proper operation in the GMC Sierra.
5. Can I continue driving my 2015 GMC Sierra with OBDII code C0379 present?
It is not recommended to drive the GMC Sierra with code C0379 present, as it can lead to potential safety issues and further damage to the 4WD system. It is best to address the issue promptly.
6. How can I repair OBDII code C0379 related to the Front Axle Switch Circuit in my 2015 GMC Sierra?
Repairing code C0379 may involve replacing the front axle switch, repairing or replacing damaged wiring and connectors, or addressing any issues with the front axle actuator in the 2015 GMC Sierra.
7. Are there any DIY tips for addressing OBDII code C0379 in a 2015 GMC Sierra?
While some basic diagnostic steps can be taken by DIY enthusiasts, repairing code C0379 may require specialized tools and expertise. It is advisable to consult a professional mechanic for proper diagnosis and repair.
8. How much does it typically cost to fix OBDII code C0379 for the Front Axle Switch Circuit in a 2015 GMC Sierra?
The cost of fixing code C0379 can vary depending on the exact cause of the issue and the labor rates in your area. It is recommended to obtain estimates from local mechanics or dealerships for an accurate cost assessment.
9. Can a faulty front axle switch cause other issues in a 2015 GMC Sierra besides triggering code C0379?
Yes, a faulty front axle switch can potentially cause other issues such as erratic 4WD engagement, improper front axle operation, or even damage to the front differential if left unresolved in the GMC Sierra.
10. Is it important to reset the OBDII system after fixing code C0379 in a 2015 GMC Sierra?
Yes, it is crucial to reset the OBDII system after fixing code C0379 to clear the error code and ensure that the repair has been successful. This can be done using an OBDII scanner or by disconnecting the battery for a few minutes.
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