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P2771 2015 GMC Sierra Code - Four Wheel Drive Low Switch Circuit

Quick Answer

The P2771 diagnostic trouble code (DTC) for the 2015 GMC Sierra relates to the Four Wheel Drive Low Switch Circuit. Common causes include Faulty wiring harness connections, Defective four-wheel drive low switch, Malfunctioning transfer case control module. 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
P2771 2015 GMC Sierra indicates Four Wheel Drive Low Switch Circuit.
Common causes
Common causes include Faulty wiring harness connections, Defective four-wheel drive low switch, Malfunctioning transfer case control module.
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 P2771 2015 GMC Sierra Description

The P2771 diagnostic trouble code (DTC) for the 2015 GMC Sierra relates to the Four Wheel Drive Low Switch Circuit. This code indicates a problem with the electrical circuit that controls the activation of the four-wheel-drive low range in the vehicle. The four-wheel-drive system allows the driver to switch between two-wheel drive, four-wheel drive high range, and four-wheel drive low range for off-road or low-traction situations.

OBDII Code P2771 2015 GMC Sierra - Four Wheel Drive Low Switch Circuit
P2771 2015 GMC Sierra Code - Four Wheel Drive Low Switch Circuit

Common Causes of P2771 2015 GMC Sierra

  1. Faulty wiring harness connections
  2. Defective four-wheel drive low switch
  3. Malfunctioning transfer case control module
  4. Issue with the four-wheel drive actuator
  5. Corrosion or damage to electrical connectors related to the four-wheel drive system

Symptoms of P2771 2015 GMC Sierra

  1. Inability to engage four-wheel drive low range
  2. Dashboard warning light indicating a four-wheel drive system fault
  3. Difficulty shifting between different four-wheel drive modes
  4. Strange noises or grinding sounds when trying to activate four-wheel drive
  5. Reduced off-road traction and performance

How to Fix P2771 2015 GMC Sierra

  1. Begin by conducting a thorough visual inspection of the wiring harness, connectors, and switch related to the four-wheel drive low circuit.
  2. Test the functionality of the four-wheel drive low switch using a multimeter to check for proper continuity and resistance.
  3. Inspect the transfer case control module for any signs of damage or malfunction, and consider reprogramming or replacing it if necessary.
  4. Check the four-wheel drive actuator for proper operation, ensuring that it engages and disengages correctly.
  5. Clear the fault codes from the vehicle's computer system and test the four-wheel drive low system to ensure the issue has been resolved.

Cost to Fix P2771 2015 GMC Sierra

The cost of repairing the Four Wheel Drive Low Switch Circuit issue can vary depending on the specific cause of the problem and the parts needed for the repair. Generally, the cost can range from $200 to $600, including parts and labor. However, it's important to note that prices can differ based on the location of the repair shop, the make and model of the vehicle, and the specific components that need to be replaced. Additionally, diagnostic time and labor rates at auto repair shops can range from $80 to $150 per hour, so it's advisable to check with local shops for a more accurate estimate.

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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 P2771 2015 GMC Sierra Code

1. What does the OBDII code P2771 mean on a 2015 GMC Sierra?

P2771 indicates an issue with the Four Wheel Drive (4WD) Low Switch Circuit, which signals a potential problem with the wiring, switch, or related components in the 4WD system.

2. What are the common symptoms of the P2771 code in a 2015 GMC Sierra?

Common symptoms include the 4WD system not engaging properly, the 4WD Low mode not working, and illumination of the check engine light or 4WD warning light.

3. What causes the P2771 code to appear?

Causes may include a faulty 4WD low switch, damaged or corroded wiring or connectors, or an issue with the transfer case control module.

4. Can I still drive my 2015 GMC Sierra with the P2771 code?

Yes, but you may not be able to use the 4WD Low feature, which can be problematic in off-road or low-traction conditions. It’s best to address the issue promptly.

5. How do I diagnose the P2771 code on a 2015 GMC Sierra?

Use an OBDII scanner to confirm the code, inspect the 4WD low switch, check for damaged wiring or loose connections, and test the transfer case control module.

6. What repairs are commonly needed to fix the P2771 code?

Repairs may include replacing the 4WD low switch, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the transfer case control module.

7. How much does it cost to fix the P2771 code on a 2015 GMC Sierra?

Repair costs vary depending on the issue, but replacing the 4WD low switch typically costs $100–$300, while module repairs or wiring fixes may cost more.

8. Can a failing transfer case cause the P2771 code?

While rare, a failing or malfunctioning transfer case could potentially contribute to this code if it cannot properly engage 4WD Low.

9. Will clearing the P2771 code with a scanner fix the problem?

Clearing the code may temporarily reset the warning, but the underlying issue must be addressed to prevent the code from returning.

10. How can I prevent the P2771 code from occurring again?

Regularly inspect and maintain the 4WD system, including switches, wiring, and connectors, and address any issues as soon as they arise.

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