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Engine-Codes – GMC – P279C 2016 GMC Sierra

P279C 2016 GMC Sierra Code - Four Wheel Drive Neutral Range Performance

Quick Answer

The diagnostic trouble code (DTC) P279C for a 2016 GMC Sierra refers to "Four Wheel Drive Neutral Range Performance." This code indicates that there is a problem with the neutral range performance of the four-wheel-drive system in the vehicle. Common causes include Faulty four-wheel-drive actuator or transfer case, Wiring issues or loose connections in the four-wheel-drive system, Malfunctioning sensors or switches related to the neutral range performance. 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
P279C 2016 GMC Sierra indicates Four Wheel Drive Neutral Range Performance.
Common causes
Common causes include Faulty four-wheel-drive actuator or transfer case, Wiring issues or loose connections in the four-wheel-drive system, Malfunctioning sensors or switches related to the neutral range performance.
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 29, 2024
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Code P279C 2016 GMC Sierra Description

The diagnostic trouble code (DTC) P279C for a 2016 GMC Sierra refers to "Four Wheel Drive Neutral Range Performance." This code indicates that there is a problem with the neutral range performance of the four-wheel-drive system in the vehicle. The neutral range is a setting that allows the vehicle to be towed without the wheels turning, and any issues with this range can affect the vehicle's ability to shift into four-wheel drive properly.

OBDII Code P279C 2016 GMC Sierra - Four Wheel Drive Neutral Range Performance
P279C 2016 GMC Sierra Code - Four Wheel Drive Neutral Range Performance

Common Causes of P279C 2016 GMC Sierra

  1. Faulty four-wheel-drive actuator or transfer case.
  2. Wiring issues or loose connections in the four-wheel-drive system.
  3. Malfunctioning sensors or switches related to the neutral range performance.
  4. Low fluid levels in the transfer case or differential.
  5. Mechanical damage to the drivetrain components.

Symptoms of P279C 2016 GMC Sierra

  1. Difficulty shifting into or out of four-wheel drive.
  2. Four-wheel-drive system getting stuck in a specific mode.
  3. Dashboard warning light indicating an issue with the four-wheel-drive system.
  4. Unusual noises or vibrations when engaging four-wheel drive.
  5. Reduced traction or stability in slippery road conditions.

How to Fix P279C 2016 GMC Sierra

  1. Diagnose the specific cause of the code by using a scan tool to retrieve additional information from the vehicle's computer.
  2. Inspect the four-wheel-drive actuator, transfer case, sensors, and wiring for any signs of damage or malfunction.
  3. Replace any faulty components, such as the actuator, sensors, or wiring harness, as needed.
  4. Clear the DTC from the vehicle's computer and test the four-wheel-drive system to ensure proper operation.
  5. Perform a road test to verify that the issue has been resolved and that the four-wheel-drive system functions correctly in different driving conditions.

Cost to Fix P279C 2016 GMC Sierra

The typical repair costs for addressing a DTC P279C on a 2016 GMC Sierra can vary depending on the specific cause of the issue and the parts and labor required for the repair. In general, the cost of replacing a faulty four-wheel-drive actuator or sensors can range from $200 to $500, while more extensive repairs involving the transfer case or wiring harness may cost between $500 and $1000 or more.

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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 P279C 2016 GMC Sierra Code

1. What does the OBDII code P279C mean on a 2016 GMC Sierra?

P279C indicates an issue with the Four-Wheel Drive Neutral Range Performance, meaning the transfer case is not engaging or disengaging the neutral range properly.

2. What are the common symptoms of the P279C code on a 2016 GMC Sierra?

Symptoms may include the "Service 4WD" warning light, inability to switch drivetrain modes, unusual noises from the transfer case, or the vehicle being stuck in neutral.

3. What causes the P279C code to appear on a 2016 GMC Sierra?

Common causes include a faulty transfer case shift motor, issues with the transfer case control module, wiring problems, or mechanical failure in the transfer case.

4. Can driving with the P279C code damage my 2016 GMC Sierra?

Yes, continuing to drive with this code can lead to further damage to the transfer case or drivetrain components, especially if the vehicle becomes stuck in an improper mode.

5. How is the P279C code diagnosed on a 2016 GMC Sierra?

A mechanic will use a scan tool to confirm the code, inspect the transfer case shift motor, check the wiring and connectors, and test the transfer case control module for proper operation.

6. How do I fix the P279C code on my 2016 GMC Sierra?

Repairs may involve replacing the transfer case shift motor, repairing or replacing damaged wiring, recalibrating the transfer case control module, or addressing mechanical failures in the transfer case.

7. Can a software issue cause the P279C code on a 2016 GMC Sierra?

Yes, outdated or corrupted software in the transfer case control module can cause this code, and a software update or reprogramming may resolve the issue.

8. How much does it cost to fix the P279C code on a 2016 GMC Sierra?

The cost can vary widely depending on the specific issue, ranging from $100 for a simple wiring repair to $1,500 or more for transfer case repairs or component replacements.

9. Can I clear the P279C code on my 2016 GMC Sierra without fixing the issue?

Clearing the code without addressing the root cause will only temporarily remove the warning, and the code will likely reappear as the issue persists.

10. Is the P279C code a common problem in 2016 GMC Sierra trucks?

While not extremely common, this code can occur in vehicles with frequent use of the four-wheel-drive system or in trucks with high mileage and transfer case wear.

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