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Engine-Codes – GMC – P279A 2014 GMC Sierra

P279A 2014 GMC Sierra Code - Four Wheel Drive High Range Performance

Quick Answer

The P279A code is a diagnostic trouble code (DTC) that indicates a problem with the four-wheel drive (4WD) high range performance in a 2014 GMC Sierra. Common causes include Faulty transfer case position sensor, leading to incorrect readings, Malfunctioning transfer case control module or wiring issues, Low or contaminated transfer case fluid affecting 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
P279A 2014 GMC Sierra indicates Four Wheel Drive High Range Performance.
Common causes
Common causes include Faulty transfer case position sensor, leading to incorrect readings, Malfunctioning transfer case control module or wiring issues, Low or contaminated transfer case fluid affecting 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 Oct 03, 2024
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Code P279A 2014 GMC Sierra Description

The P279A code is a diagnostic trouble code (DTC) that indicates a problem with the four-wheel drive (4WD) high range performance in a 2014 GMC Sierra. This code is specifically related to the transfer case, which is responsible for distributing power from the engine to the front and rear axles. When the vehicle's onboard diagnostic system detects that the transfer case is not performing optimally in high-range mode, it triggers this code.

OBDII Code P279A 2014 GMC Sierra - Four Wheel Drive High Range Performance
P279A 2014 GMC Sierra Code - Four Wheel Drive High Range Performance

Common Causes of P279A 2014 GMC Sierra

  1. Faulty transfer case position sensor, leading to incorrect readings.
  2. Malfunctioning transfer case control module or wiring issues.
  3. Low or contaminated transfer case fluid affecting performance.
  4. Mechanical failure within the transfer case, such as worn gears or bearings.
  5. Issues with the vehicle's electronic control unit (ECU) affecting 4WD operation.

Symptoms of P279A 2014 GMC Sierra

  1. Difficulty engaging or disengaging the 4WD system.
  2. Unusual noises from the transfer case, such as grinding or clunking sounds.
  3. Warning lights illuminated on the dashboard, particularly the 4WD indicator.
  4. Reduced traction or stability when driving in 4WD mode.
  5. Increased fuel consumption due to inefficient power distribution.

How to Fix P279A 2014 GMC Sierra

  1. Diagnostic Scan: Begin by using a professional OBD-II scanner to confirm the P279A code and check for any additional codes that may provide further insight into the issue.
  2. Visual Inspection: Inspect the transfer case and associated wiring for any visible damage, loose connections, or signs of fluid leaks.
  3. Fluid Check: Examine the transfer case fluid level and condition. If the fluid is low or contaminated, it should be replaced, and any leaks should be addressed.
  4. Sensor Testing: Test the transfer case position sensor and control module for proper functionality. Replace any faulty components as necessary.
  5. Mechanical Inspection: If electrical components are functioning correctly, perform a mechanical inspection of the transfer case to identify any internal damage or wear that may require repair or replacement.

Cost to Fix P279A 2014 GMC Sierra

** The cost to repair a P279A code can vary significantly based on the specific issue identified during diagnosis. Typical repair costs may range from $200 to $1,500, depending on whether it involves simple fluid changes, sensor replacements, or more extensive mechanical repairs. Labor rates can vary widely; most auto repair shops charge between $80 and $150 per hour. In metropolitan areas or at dealerships, rates may be higher, while independent shops often offer lower rates. It's advisable to check local rates for a more precise estimate and to obtain multiple quotes to ensure a fair price for the repair.

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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 P279A 2014 GMC Sierra Code

1. What does the OBDII code P279A mean for a 2014 GMC Sierra?

P279A indicates a "Four-Wheel Drive High Range Performance" issue, meaning the vehicle's control module has detected a problem with the 4WD system while in high range.

2. What are the common symptoms of a P279A code on a 2014 GMC Sierra?

Symptoms may include the 4WD system not engaging or disengaging properly, difficulty shifting into high range, a 4WD warning light on the dashboard, or reduced off-road performance.

3. What causes the P279A code to appear on a 2014 GMC Sierra?

Possible causes include a faulty transfer case motor, damaged wiring or connectors, low or contaminated transfer case fluid, or a malfunctioning transfer case control module.

4. How can I diagnose a P279A code on my 2014 GMC Sierra?

Start by scanning the vehicle with an OBDII tool to confirm the code. Inspect the transfer case motor, wiring, and fluid condition. Check for physical damage to components or electrical connectors.

5. Can low transfer case fluid cause a P279A code on a 2014 GMC Sierra?

Yes, low or contaminated transfer case fluid can cause the transfer case to perform poorly, triggering a P279A code.

6. How do I fix the P279A code on a 2014 GMC Sierra?

Repairs may include replacing the transfer case motor, repairing damaged wiring, flushing and refilling the transfer case fluid, or replacing the transfer case control module if defective.

7. Is it safe to drive with a P279A code on a 2014 GMC Sierra?

It may be safe to drive in 2WD mode, but 4WD functionality could be compromised. Avoid off-road driving until the issue is resolved.

8. How much does it cost to repair a P279A code on a 2014 GMC Sierra?

Repair costs vary depending on the cause. Transfer case motor replacement can range from $300 to $700, while fluid changes or wiring repairs may cost less.

9. Can a P279A code be caused by a software issue in the 2014 GMC Sierra?

Yes, a software glitch in the transfer case control module could potentially cause the code. Updating the module's software may resolve the issue.

10. Will clearing the P279A code fix the problem on a 2014 GMC Sierra?

Clearing the code without addressing the root cause will likely result in the code returning. Proper diagnosis and repair are necessary for a permanent fix.

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