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P2771 2014 GMC Sierra Code - Four Wheel Drive Low Switch Circuit

Quick Answer

The P2771 diagnostic trouble code (DTC) for a 2014 GMC Sierra relates to the Four Wheel Drive Low Switch Circuit. Common causes include Faulty Four Wheel Drive Low switch, Wiring issues or shorts in the circuit, Defective Four Wheel Drive 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 2014 GMC Sierra indicates Four Wheel Drive Low Switch Circuit.
Common causes
Common causes include Faulty Four Wheel Drive Low switch, Wiring issues or shorts in the circuit, Defective Four Wheel Drive 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 11, 2024
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Code P2771 2014 GMC Sierra Description

The P2771 diagnostic trouble code (DTC) for a 2014 GMC Sierra relates to the Four Wheel Drive Low Switch Circuit. This code indicates an issue with the circuit that controls the activation of the Four Wheel Drive Low mode in the vehicle. The Four Wheel Drive Low mode is typically used for off-road driving or when extra traction is needed in challenging driving conditions. When this code is triggered, it can affect the vehicle's ability to engage Four Wheel Drive Low, impacting its performance and drivability.

OBDII Code P2771 2014 GMC Sierra - Four Wheel Drive Low Switch Circuit
P2771 2014 GMC Sierra Code - Four Wheel Drive Low Switch Circuit

Common Causes of P2771 2014 GMC Sierra

  1. Faulty Four Wheel Drive Low switch
  2. Wiring issues or shorts in the circuit
  3. Defective Four Wheel Drive control module
  4. Corrosion or damage to electrical connectors
  5. Water or moisture intrusion into the circuit

Symptoms of P2771 2014 GMC Sierra

  1. Difficulty engaging Four Wheel Drive Low mode
  2. Four Wheel Drive Low mode not working at all
  3. Illumination of the Four Wheel Drive warning light on the dashboard
  4. Unusual noises or vibrations when trying to engage Four Wheel Drive Low
  5. Decreased traction and performance in off-road or challenging driving conditions

How to Fix P2771 2014 GMC Sierra

  1. Diagnose the issue by using a scan tool to retrieve the specific DTC and pinpoint the exact cause of the problem.
  2. Inspect the Four Wheel Drive Low switch and wiring for any visible damage or corrosion.
  3. Test the circuit for continuity and resistance to identify any faults.
  4. Replace the faulty Four Wheel Drive Low switch or repair any damaged wiring or connectors.
  5. Clear the DTC from the vehicle's memory and test the Four Wheel Drive system to ensure proper operation.

Cost to Fix P2771 2014 GMC Sierra

The typical repair costs for addressing a P2771 Four Wheel Drive Low Switch Circuit issue can vary depending on the exact cause of the problem and the specific parts and labor required for the repair. In general, the cost for parts such as a new Four Wheel Drive Low switch or wiring repair kit can range from $50 to $200. Labor costs at auto repair shops typically range from $80 to $150 per hour. Overall, the total repair cost for this issue could range from $150 to $500, but it's advisable to check with local repair shops for a more accurate estimate based on your specific vehicle and location.

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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 2014 GMC Sierra Code

1. What does the OBDII code P2771 mean on a 2014 GMC Sierra?

- Code P2771 indicates a fault in the Four Wheel Drive Low Switch Circuit, suggesting that there is an issue with the electrical circuit associated with the 4WD low range function.

2. What symptoms might I notice if my 2014 GMC Sierra has the P2771 code?

- Symptoms can include the 4WD system failing to engage or disengage properly, an illuminated check engine light, and possibly other 4WD system warning lights.

3. What are common causes of the P2771 code in a 2014 GMC Sierra?

- Common causes include a faulty 4WD low switch, damaged wiring or connectors in the 4WD switch circuit, or a problem with the 4WD control module.

4. How can I diagnose the P2771 code in my 2014 GMC Sierra?

- Diagnosis should begin with a visual inspection of all relevant wiring and connectors. Use a multimeter to check for continuity and proper voltage in the 4WD low switch circuit. It may also be necessary to scan the vehicle with a diagnostic tool to monitor 4WD switch input signals.

5. What are some possible repairs for the P2771 code on a 2014 GMC Sierra?

- Repairs can include replacing the 4WD low switch, repairing or replacing damaged wiring or connectors, or in some cases, replacing the 4WD control module if it is found to be defective.

6. Is it safe to drive my 2014 GMC Sierra with the P2771 code active?

- While you might still be able to drive your vehicle, it is not recommended to use the 4WD function until the issue is resolved, as it could lead to further damage or loss of control in certain driving conditions.

7. Can the P2771 code affect the overall performance of my vehicle?

- Yes, besides the 4WD system malfunctions, the P2771 code might not directly affect the engine performance, but it can lead to complications with handling and driving safety in off-road or slippery conditions.

8. How urgent is it to fix a P2771 code in a 2014 GMC Sierra?

- It is moderately urgent to address this issue, especially if you rely on the 4WD for regular driving conditions. Delaying repairs can lead to further damage to the 4WD system components.

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