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P2771 2016 GMC Sierra Code - Four Wheel Drive Low Switch Circuit

Quick Answer

The P2771 diagnostic trouble code (DTC) for a 2016 GMC Sierra relates to the Four Wheel Drive Low Switch Circuit. Common causes include Faulty Four Wheel Drive Low Switch, Damaged wiring or connectors in the switch circuit, 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 2016 GMC Sierra indicates Four Wheel Drive Low Switch Circuit.
Common causes
Common causes include Faulty Four Wheel Drive Low Switch, Damaged wiring or connectors in the switch circuit, 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 15, 2024
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Code P2771 2016 GMC Sierra Description

The P2771 diagnostic trouble code (DTC) for a 2016 GMC Sierra relates to the Four Wheel Drive Low Switch Circuit. This code indicates that there is a malfunction in the circuit responsible for engaging the four-wheel drive low mode in the vehicle. The four-wheel drive low mode is essential for providing additional traction and torque in off-road or challenging driving conditions. When this circuit is not functioning properly, it can lead to issues with engaging or disengaging the four-wheel drive low mode, potentially compromising the vehicle's performance and safety.

OBDII Code P2771 2016 GMC Sierra - Four Wheel Drive Low Switch Circuit
P2771 2016 GMC Sierra Code - Four Wheel Drive Low Switch Circuit

Common Causes of P2771 2016 GMC Sierra

  1. Faulty Four Wheel Drive Low Switch
  2. Damaged wiring or connectors in the switch circuit
  3. Malfunctioning transfer case control module
  4. Corrosion or moisture in the switch circuit components
  5. Issues with the vehicle's computer system or software related to the transfer case

Symptoms of P2771 2016 GMC Sierra

  1. Difficulty engaging or disengaging four-wheel drive low mode
  2. Illumination of the four-wheel drive warning light on the dashboard
  3. Limited traction or power delivery in off-road or slippery conditions
  4. Unusual noises coming from the transfer case area
  5. Reduced fuel efficiency due to constant engagement of four-wheel drive low mode

How to Fix P2771 2016 GMC Sierra

  1. Begin by conducting a visual inspection of the Four Wheel Drive Low Switch and its wiring for any visible damage or corrosion.
  2. Use a multimeter to test the continuity of the switch circuit components and verify proper electrical connections.
  3. If necessary, replace the Four Wheel Drive Low Switch and repair any damaged wiring or connectors.
  4. Clear the DTC from the vehicle's computer system using a diagnostic scan tool.
  5. Test the functionality of the four-wheel drive low mode to ensure proper engagement and operation.

Cost to Fix P2771 2016 GMC Sierra

The typical repair costs for addressing the P2771 Four Wheel Drive Low Switch Circuit code in a 2016 GMC Sierra can vary depending on the specific cause of the issue. Replacement of the Four Wheel Drive Low Switch itself may cost between $50 and $150, while labor costs can range from $100 to $200. Additional costs for diagnostic testing, wiring repairs, or control module replacement may increase the total repair bill. It's advisable to consult with a qualified mechanic or dealership for a more accurate estimate based on the specific circumstances of the vehicle. Keep in mind that labor rates at auto repair shops can vary, so it's recommended to inquire about pricing before proceeding with 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 P2771 2016 GMC Sierra Code

1. What does the OBDII code P2771 mean on a 2016 GMC Sierra?

P2771 indicates an issue with the Four-Wheel Drive Low Switch Circuit, typically related to the vehicle's transfer case system.

2. What are the common symptoms of P2771 on a 2016 GMC Sierra?

Symptoms may include the 4WD Low mode not engaging, a check engine light, or unusual drivetrain performance.

3. What causes the P2771 code to appear on a 2016 GMC Sierra?

Common causes include a faulty 4WD low switch, damaged wiring, poor electrical connections, or a malfunctioning transfer case control module.

4. Can I still drive my 2016 GMC Sierra with a P2771 code?

While the vehicle may still be drivable, 4WD Low functionality will be compromised. Avoid situations requiring 4WD Low until the issue is resolved.

5. How do I diagnose the P2771 code in a 2016 GMC Sierra?

Start by scanning the vehicle with an OBDII scanner, inspecting the 4WD low switch and its wiring for damage, and testing the transfer case control module.

6. How can I fix the P2771 code on my 2016 GMC Sierra?

Repairs may include replacing the 4WD low switch, repairing or replacing damaged wiring, or addressing issues with the transfer case control module.

7. What tools are required to troubleshoot the P2771 code on a 2016 GMC Sierra?

You'll need an OBDII scanner, a multimeter for electrical testing, and basic hand tools for inspecting and replacing parts.

8. How much does it cost to repair a P2771 code on a 2016 GMC Sierra?

Repair costs can range from $100 to $500, depending on whether the issue is with the switch, wiring, or transfer case module.

9. Can a bad transfer case cause the P2771 code on a 2016 GMC Sierra?

Yes, a malfunctioning transfer case or its control module can trigger the P2771 code if it fails to communicate properly with the 4WD system.

10. Is the P2771 code a common issue on a 2016 GMC Sierra?

It’s not extremely common but can occur, especially in vehicles frequently used in off-road conditions or harsh environments.

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