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Engine-Codes – GMC – P279B 2014 GMC Sierra

P279B 2014 GMC Sierra Code - Four Wheel Drive Low Range Performance

Quick Answer

The diagnostic trouble code P279B for a 2014 GMC Sierra indicates a problem with the performance of the Four Wheel Drive Low Range system. Common causes include Faulty transfer case actuator motor, Malfunctioning Four Wheel Drive Low Range switch or sensors, Wiring issues or electrical connection problems. 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
P279B 2014 GMC Sierra indicates Four Wheel Drive Low Range Performance .
Common causes
Common causes include Faulty transfer case actuator motor, Malfunctioning Four Wheel Drive Low Range switch or sensors, Wiring issues or electrical connection problems.
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 P279B 2014 GMC Sierra Description

The diagnostic trouble code P279B for a 2014 GMC Sierra indicates a problem with the performance of the Four Wheel Drive Low Range system. This system allows the vehicle to operate in low-range mode, providing increased torque and traction for off-road or challenging driving conditions. When this code is triggered, it means that the vehicle's computer has detected a discrepancy in the operation of the Four Wheel Drive Low Range system, which can affect the vehicle's performance and drivability.

OBDII Code P279B 2014 GMC Sierra - Four Wheel Drive Low Range Performance
P279B 2014 GMC Sierra Code - Four Wheel Drive Low Range Performance

Common Causes of P279B 2014 GMC Sierra

  1. Faulty transfer case actuator motor
  2. Malfunctioning Four Wheel Drive Low Range switch or sensors
  3. Wiring issues or electrical connection problems
  4. Defective control module for the Four Wheel Drive system
  5. Low fluid levels or contamination in the transfer case

Symptoms of P279B 2014 GMC Sierra

  1. Difficulty engaging or disengaging Four Wheel Drive Low Range mode
  2. Illumination of the Four Wheel Drive warning light on the dashboard
  3. Unusual noises coming from the transfer case or drivetrain
  4. Reduced traction or difficulty maintaining control in off-road conditions

How to Fix P279B 2014 GMC Sierra

  1. Diagnose the specific cause of the code by using a scan tool to retrieve additional fault codes and perform a visual inspection of the Four Wheel Drive system components.
  2. Test the transfer case actuator motor, sensors, and wiring for proper operation and continuity.
  3. Replace any faulty components such as the actuator motor, sensors, or control module as needed.
  4. Clear the diagnostic trouble codes from the vehicle's computer and perform a test drive to verify that the issue has been resolved.
  5. Perform a final inspection to ensure that the Four Wheel Drive Low Range system is functioning correctly and that there are no further issues.

Cost to Fix P279B 2014 GMC Sierra

The typical repair costs for addressing the Four Wheel Drive Low Range Performance issue can vary depending on the specific cause of the problem and the cost of parts and labor. In general, the repair costs for this type of issue can range from $200 to $800 or more. It's important to note that the diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to check with local repair shops for a more accurate estimate based on your specific situation.

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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 P279B 2014 GMC Sierra Code

1. What are the common symptoms of OBDII code P279B in a 2014 GMC Sierra related to Four Wheel Drive Low Range Performance?

- Common symptoms include difficulty engaging or disengaging four-wheel drive low range mode, erratic shifting between gears, and a noticeable decrease in off-road performance.

2. What are the possible causes of OBDII code P279B in a 2014 GMC Sierra?

- The code P279B can be triggered by issues such as a faulty transfer case actuator, damaged wiring or connectors in the four-wheel drive system, low fluid levels in the transfer case, or a malfunctioning transfer case control module.

3. How can I diagnose the cause of OBDII code P279B in my 2014 GMC Sierra?

- To diagnose the issue, you can start by checking the fluid level in the transfer case, inspecting the wiring and connectors for any damage, and using a diagnostic scanner to retrieve additional fault codes and data related to the four-wheel drive system.

4. Is it safe to continue driving my 2014 GMC Sierra with OBDII code P279B triggered?

- It is not recommended to continue driving the vehicle with the code P279B active, as it can lead to further damage to the four-wheel drive system and affect the vehicle's overall drivability.

5. Can I repair OBDII code P279B in my 2014 GMC Sierra myself, or should I take it to a professional mechanic?

- The complexity of the repair for code P279B varies depending on the root cause, so it is advisable to consult a professional mechanic with experience in diagnosing and repairing four-wheel drive system issues.

6. Are there any quick fixes or temporary solutions for OBDII code P279B in a 2014 GMC Sierra?

- Quick fixes such as checking and refilling the transfer case fluid, ensuring proper electrical connections, and performing a system reset may help temporarily address the issue, but a proper diagnosis and repair are still recommended.

7. How much can I expect to pay for repairing OBDII code P279B in a 2014 GMC Sierra?

- The cost of repairing code P279B can vary depending on the root cause of the issue, but it may involve replacing components such as the transfer case actuator, wiring harness, or control module, which can range from a few hundred to over a thousand dollars.

8. Will resetting the OBDII code P279B in my 2014 GMC Sierra make it go away permanently?

- Resetting the code may temporarily clear the warning light, but if the underlying issue causing code P279B is not addressed, the code is likely to return once the system detects the fault again.

9. How long does it typically take to repair OBDII code P279B in a 2014 GMC Sierra?

- The repair time for code P279B can vary depending on the specific cause and the availability of parts, but it may take a few hours to a full day for a mechanic to diagnose, repair, and test the four-wheel drive system.

10. Can extreme off-road driving or harsh conditions trigger OBDII code P279B in a 2014 GMC Sierra?

- Yes, extreme off-road driving, exposure to harsh conditions, or water ingress into the four-wheel drive system can contribute to issues that may trigger code P279B in a 2014 GMC Sierra. Regular maintenance and inspections can help prevent such issues.

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