C0379 2018 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 2018 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 2018 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 2018 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 2018 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 2018 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 2018 GMC Sierra code?
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Frequently Asked Questions about C0379 2018 GMC Sierra Code
1. What are common symptoms of OBDII code C0379 Front Axle Switch Circuit in a 2018 GMC Sierra?
The common symptoms include the inability to engage or disengage the front axle, illuminated service 4WD light on the dashboard, and a loss of functionality in the 4WD system.
2. What are the potential causes of OBDII code C0379 in a 2018 GMC Sierra?
Possible causes of this code include a faulty front axle switch, damaged wiring or connectors in the circuit, a malfunctioning transfer case control module, or issues with the front axle actuator.
3. How can I diagnose the OBDII code C0379 Front Axle Switch Circuit issue in my 2018 GMC Sierra?
Diagnosing this issue typically involves using a scan tool to retrieve the trouble codes, inspecting the front axle switch and related wiring for damage, testing the front axle actuator, and checking the transfer case control module for proper operation.
4. Can I still drive my 2018 GMC Sierra with OBDII code C0379 Front Axle Switch Circuit?
It is generally not recommended to drive the vehicle with this code present, as it can lead to potential safety issues and further damage to the 4WD system. It's best to address the problem promptly.
5. How can I repair OBDII code C0379 in my 2018 GMC Sierra?
Repairing this code may involve replacing the front axle switch, repairing or replacing damaged wiring or connectors, testing and potentially replacing the front axle actuator, or reprogramming the transfer case control module.
6. Are there any DIY tips for fixing OBDII code C0379 in a 2018 GMC Sierra?
While some basic troubleshooting steps can be done by DIY enthusiasts, diagnosing and repairing this code may require specialized tools and expertise. It's recommended to consult a professional mechanic for accurate diagnosis and repair.
7. How much does it typically cost to repair OBDII code C0379 Front Axle Switch Circuit in a 2018 GMC Sierra?
The cost of repairing this code can vary depending on the exact cause of the issue, the required parts, and labor costs. It's advisable to get a few quotes from different repair shops to compare prices.
8. Can a faulty front axle switch cause other issues in a 2018 GMC Sierra besides triggering OBDII code C0379?
Yes, a faulty front axle switch can potentially cause other issues such as difficulty engaging or disengaging 4WD, erratic 4WD system behavior, or even complete failure of the 4WD system.
9. Is OBDII code C0379 Front Axle Switch Circuit a common problem in 2018 GMC Sierra vehicles?
While not extremely common, issues with the front axle switch circuit can occur in 2018 GMC Sierra vehicles, particularly in those subjected to harsh driving conditions or off-road use.
10. How can I prevent OBDII code C0379 Front Axle Switch Circuit from occurring in my 2018 GMC Sierra?
Regular maintenance, avoiding harsh driving conditions, and promptly addressing any issues with the 4WD system can help prevent the occurrence of this OBDII code in your 2018 GMC Sierra.
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