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P279A 2016 GMC Sierra Code - Four Wheel Drive High Range Performance

Quick Answer

The diagnostic trouble code P279A for a 2016 GMC Sierra indicates a problem with the performance of the four-wheel-drive high range. Common causes include Faulty four-wheel-drive actuator or motor, Malfunctioning transfer case control module, Wiring or electrical issues in the four-wheel-drive system. 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 2016 GMC Sierra indicates Four Wheel Drive High Range Performance.
Common causes
Common causes include Faulty four-wheel-drive actuator or motor, Malfunctioning transfer case control module, Wiring or electrical issues in the four-wheel-drive system.
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 15, 2024
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Code P279A 2016 GMC Sierra Description

The diagnostic trouble code P279A for a 2016 GMC Sierra indicates a problem with the performance of the four-wheel-drive high range. This code is typically triggered when the vehicle's onboard computer detects that the four-wheel-drive system is not operating as it should, potentially leading to issues with the vehicle's drivability and overall performance. The four-wheel-drive high range is an essential feature in a vehicle like the GMC Sierra, as it allows the driver to switch between two-wheel drive and four-wheel drive modes to optimize traction and stability in different driving conditions.

OBDII Code P279A 2016 GMC Sierra - Four Wheel Drive High Range Performance
P279A 2016 GMC Sierra Code - Four Wheel Drive High Range Performance

Common Causes of P279A 2016 GMC Sierra

  1. Faulty four-wheel-drive actuator or motor.
  2. Malfunctioning transfer case control module.
  3. Wiring or electrical issues in the four-wheel-drive system.
  4. Low or contaminated fluid levels in the transfer case.
  5. Mechanical issues with the transfer case components.

Symptoms of P279A 2016 GMC Sierra

  1. Difficulty engaging or disengaging four-wheel drive high range.
  2. Illumination of the four-wheel-drive warning light on the dashboard.
  3. Unusual noises coming from the drivetrain when switching between drive modes.
  4. Reduced traction or stability when driving in challenging road conditions.
  5. Decreased overall performance and responsiveness of the vehicle.

How to Fix P279A 2016 GMC Sierra

  1. Begin by conducting a thorough diagnostic scan to confirm the presence of the P279A trouble code and identify the specific underlying cause.
  2. Inspect the four-wheel-drive actuator, motor, and transfer case control module for any signs of damage or malfunction.
  3. Check the wiring and electrical connections in the four-wheel-drive system for any loose connections or corrosion.
  4. Verify the fluid levels in the transfer case and perform a fluid flush and refill if necessary.
  5. Replace any faulty components identified during the diagnostic process, such as the actuator, motor, or control module, and retest the system to ensure proper operation.

Cost to Fix P279A 2016 GMC Sierra

The cost of repairing the four-wheel-drive high range performance issue on a 2016 GMC Sierra can vary depending on the specific cause of the problem and the extent of the repairs needed. On average, the parts and labor for this type of repair can range from $300 to $800. It's important to note that diagnostic time and labor rates at auto repair shops can vary, so it's recommended to obtain quotes from multiple sources to get an accurate estimate for 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 P279A 2016 GMC Sierra Code

1. What does the OBDII code P279A mean on a 2016 GMC Sierra?

The P279A code indicates a "Four Wheel Drive High Range Performance" issue, meaning the vehicle’s 4WD system is not performing as expected in high range mode.

2. What are common symptoms of P279A on a 2016 GMC Sierra?

Symptoms may include the 4WD system not engaging or disengaging properly, warning lights on the dashboard, reduced traction, or difficulty switching between 2WD and 4WD modes.

3. What causes the P279A code on a 2016 GMC Sierra?

Common causes include a faulty transfer case motor, damaged wiring or connectors, software issues in the transfer case control module, or mechanical problems in the transfer case.

4. Can I drive my 2016 GMC Sierra with the P279A code?

It may be possible to drive, but performance could be compromised, especially in off-road or low-traction conditions. Prolonged driving without repair could cause further damage.

5. How is the P279A code diagnosed on a 2016 GMC Sierra?

A technician will use a scan tool to confirm the code, inspect the transfer case motor, wiring, and connectors, and possibly test the transfer case control module for faults.

6. What repairs are needed to fix the P279A code on a 2016 GMC Sierra?

Repairs may include replacing the transfer case motor, repairing or replacing damaged wiring, updating the transfer case control module software, or addressing internal transfer case issues.

7. How much does it cost to fix the P279A code on a 2016 GMC Sierra?

Repair costs can vary widely, ranging from $200 for a simple wiring repair to $1,000 or more if the transfer case motor or control module needs replacement.

8. Can a software update fix the P279A code on a 2016 GMC Sierra?

Yes, in some cases, a software update for the transfer case control module can resolve the issue if the problem stems from programming errors.

9. What tools are needed to troubleshoot the P279A code?

Troubleshooting typically requires an OBDII scan tool, a multimeter for checking electrical circuits, and possibly specialized tools for transfer case component inspection.

10. How can I prevent the P279A code from recurring on my 2016 GMC Sierra?

Regular maintenance of the transfer case, ensuring proper fluid levels, inspecting wiring for damage, and addressing 4WD system issues promptly can help prevent recurrence.

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