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Engine-Codes – GMC – P279C 2017 GMC Sierra

P279C 2017 GMC Sierra Code - Four Wheel Drive Neutral Range Performance

Quick Answer

The diagnostic trouble code P279C in a 2017 GMC Sierra indicates a problem with the Four Wheel Drive Neutral Range Performance. Common causes include Faulty transfer case actuator, Malfunctioning sensors in the four-wheel-drive system, Wiring issues or corroded 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
P279C 2017 GMC Sierra indicates Four Wheel Drive Neutral Range Performance.
Common causes
Common causes include Faulty transfer case actuator, Malfunctioning sensors in the four-wheel-drive system, Wiring issues or corroded 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 07, 2024
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Code P279C 2017 GMC Sierra Description

The diagnostic trouble code P279C in a 2017 GMC Sierra indicates a problem with the Four Wheel Drive Neutral Range Performance. This code is typically triggered when the vehicle's onboard computer detects a discrepancy in the performance or operation of the four-wheel-drive system while in neutral range mode. The neutral range is a specific setting that allows the vehicle to be towed without causing damage to the drivetrain. When this code is stored, it means that there is an issue with the system's ability to engage or disengage the neutral range properly.

OBDII Code P279C 2017 GMC Sierra - Four Wheel Drive Neutral Range Performance
P279C 2017 GMC Sierra Code - Four Wheel Drive Neutral Range Performance

Common Causes of P279C 2017 GMC Sierra

  1. Faulty transfer case actuator
  2. Malfunctioning sensors in the four-wheel-drive system
  3. Wiring issues or corroded connections
  4. Mechanical failures within the four-wheel-drive system
  5. Software glitches in the vehicle's onboard computer

Symptoms of P279C 2017 GMC Sierra

  1. Difficulty engaging or disengaging four-wheel-drive mode
  2. Unusual noises coming from the four-wheel-drive system
  3. Dashboard warning lights related to the four-wheel-drive system
  4. Reduced traction or stability in slippery conditions
  5. Inability to shift into neutral range mode

How to Fix P279C 2017 GMC Sierra

  1. Perform a comprehensive diagnostic scan to retrieve the exact fault codes and identify the specific component causing the issue.
  2. Inspect the transfer case actuator, sensors, and wiring for any signs of damage or wear.
  3. Replace any faulty components, such as the transfer case actuator or sensors, as needed.
  4. Clear the fault codes and reset the system to ensure proper operation.
  5. Test drive the vehicle to verify that the four-wheel-drive system is functioning correctly and that the issue has been resolved.

Cost to Fix P279C 2017 GMC Sierra

The typical repair costs for addressing the Four Wheel Drive Neutral Range Performance issue can vary depending on the extent of the problem and the specific components that need to be replaced. In general, the cost of parts for this repair can range from $200 to $800, with labor costs adding an additional $100 to $300. Overall, the total repair cost for this issue is likely to be between $300 and $1100. However, it is essential to note that these are rough estimates, and actual costs may vary based on factors such as the location of the repair shop, the make and model of the vehicle, and the specific diagnosis and repair procedures required. It is advisable to consult with a qualified mechanic or auto repair shop to obtain a more accurate cost estimate for addressing this particular diagnostic trouble code.

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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 2017 GMC Sierra Code

1. What does the OBDII code P279C mean on a 2017 GMC Sierra?

P279C indicates an issue with the Four-Wheel Drive Neutral Range Performance, meaning the transfer case is not shifting into or functioning correctly in neutral range.

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

Symptoms may include a check engine light, the four-wheel-drive system not engaging properly, difficulty shifting into neutral range, or unusual noises from the transfer case.

3. What causes the P279C code to appear on a 2017 GMC Sierra?

Common causes include a faulty transfer case shift motor, damaged wiring or connectors, a malfunctioning transfer case control module, or mechanical issues within the transfer case.

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

Yes, driving with this code can lead to further damage to the transfer case or drivetrain components if the issue is not resolved promptly.

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

A technician will use a scan tool to check the code, inspect the transfer case and its components, test the shift motor, and check the wiring and connectors for damage or corrosion.

6. How do you fix the P279C code on a 2017 GMC Sierra?

Repairs might include replacing the transfer case shift motor, repairing or replacing damaged wiring, reprogramming or replacing the transfer case control module, or repairing internal transfer case components.

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

Repair costs can vary widely depending on the specific issue, ranging from $200 for wiring repairs to $1,500 or more for transfer case replacement.

8. Can a P279C code be triggered by low fluid levels in the transfer case?

Yes, insufficient or contaminated transfer case fluid can cause performance issues and may trigger the P279C code.

9. Is the P279C code specific to GMC vehicles?

No, the P279C code can appear on other vehicles with a similar four-wheel-drive system, but the diagnosis and repair process may vary.

10. Can I reset the P279C code without repairing the issue?

Clearing the code with a scan tool may temporarily turn off the check engine light, but the issue will likely return until the root cause is addressed.

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