AutoCodes – Chevrolet – P2771 Chevrolet

P2771 Chevrolet Code - Four Wheel Drive Low Switch Circuit

Quick Answer

For vehicles equipped with an active transfer case, the four-wheel drive (4WD) low circuit consists of the Powertrain Control Module (PCM), a transfer case control module, and the circuit wiring. Common causes include Faulty Transfer Case Shift Control Switch, Transfer Case Shift Control Switch harness is open or shorted, Transfer Case Shift Control Switch circuit poor electrical connection. 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 Chevrolet indicates Four Wheel Drive Low Switch Circuit.
Common causes: Common causes include Faulty Transfer Case Shift Control Switch, Transfer Case Shift Control Switch harness is open or shorted, Transfer Case Shift Control Switch circuit poor electrical connection.
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.

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Code Popularity 10,728

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Sep 22, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2771 Chevrolet Description

For vehicles equipped with an active transfer case, the four-wheel drive (4WD) low circuit consists of the Powertrain Control Module (PCM), a transfer case control module, and the circuit wiring. The transfer case control module controls the 4WD low signal on the low signal circuit. When the operator selects 4WD low, the transfer case control module grounds the signal circuit, and the 4WD low signal voltage on the circuit changes from ignition voltage to zero volts. The PCM then compensates for transfer case gear reduction in the transmission output shaft speed (OSS) sensor signal. The PCM uses the transmission OSS sensor signal to adjust shift points, line pressure, and torque converter clutch (TCC) scheduling.
For vehicles not equipped with an active transfer case, the 4WD low circuit consists of the PCM, a transfer case switch, and the circuit wiring. The transfer case switch controls the 4WD low signal on the signal circuit. When the operator selects 4WD low, the transfer case switch closes, and the 4WD low signal voltage on the signal circuit changes from ignition voltage to zero volts. The PCM then compensates for transfer case gear reduction in the transmission output shaft speed (OSS) sensor signal. The PCM uses the transmission OSS sensor signal to adjust shift points, line pressure, and TCC scheduling.

OBDII Code P2771 Chevrolet - Four Wheel Drive Low Switch Circuit - AutoCodes.com — P2771 Chevrolet Code - Four Wheel Drive Low Switch Circuit

What does this mean?

What are the Possible Causes of the DTC P2771 Chevrolet?

Faulty Transfer Case Shift Control Switch
Transfer Case Shift Control Switch harness is open or shorted
Transfer Case Shift Control Switch circuit poor electrical connection

How to Fix the DTC P2771 Chevrolet?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2771 Chevrolet code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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Information for Specific Chevrolet Models

P2771 2014 Chevrolet Silverado — Four Wheel Drive Low Switch Circuit
P2771 2015 Chevrolet Silverado — Four Wheel Drive Low Switch Circuit
P2771 2016 Chevrolet Silverado — Four Wheel Drive Low Switch Circuit
P2771 2017 Chevrolet Silverado — Four Wheel Drive Low Switch Circuit
P2771 2018 Chevrolet Silverado — Four Wheel Drive Low Switch Circuit

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 Chevrolet Code

1. What are the common symptoms of OBDII code P2771 in a Chevrolet related to the Four Wheel Drive Low Switch Circuit?

- Common symptoms include difficulty shifting into four-wheel drive low mode, illuminated warning lights on the dashboard, and potential issues with engaging the low-range gear.

2. What are the possible causes of OBDII code P2771 in a Chevrolet?

- The code may be triggered by issues with the Four Wheel Drive Low Switch Circuit, such as a faulty switch, damaged wiring, poor electrical connections, or a malfunctioning transfer case control module.

3. How can I diagnose the cause of OBDII code P2771 in my Chevrolet?

- To diagnose the issue, you can use a diagnostic scanner to retrieve the specific trouble code, visually inspect the wiring and connections related to the Four Wheel Drive Low Switch Circuit, and perform a circuit test to check for continuity and proper voltage.

4. Is it safe to continue driving my Chevrolet with OBDII code P2771 present?

- It is not recommended to drive the vehicle with this code present, as it may affect the proper functioning of the four-wheel drive system, potentially leading to safety hazards or further damage to the vehicle.

5. How can I repair OBDII code P2771 in my Chevrolet related to the Four Wheel Drive Low Switch Circuit?

- Repair options may include replacing the Four Wheel Drive Low Switch, repairing damaged wiring or connections, ensuring proper grounding, or recalibrating the transfer case control module.

6. Can a DIY enthusiast fix OBDII code P2771 in a Chevrolet?

- While some DIY enthusiasts may be able to diagnose and repair simple issues related to this code, more complex electrical or mechanical problems may require professional assistance to ensure proper repair and functionality.

7. Are there any preventive maintenance tips to avoid OBDII code P2771 in a Chevrolet?

- Regularly inspecting and maintaining the four-wheel drive system, checking for any signs of wear or damage, and addressing any issues promptly can help prevent the occurrence of this trouble code.

8. How long does it typically take to repair OBDII code P2771 in a Chevrolet at a professional repair shop?

- The repair time can vary depending on the specific cause of the code and the extent of the repair needed, but it may take a few hours to a full day for a professional technician to diagnose and fix the issue.

9. Will resetting the OBDII system clear OBDII code P2771 in a Chevrolet?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue with the Four Wheel Drive Low Switch Circuit is not addressed, the code is likely to reappear once the system detects the problem again.

10. Can extreme off-road driving or harsh conditions trigger OBDII code P2771 in a Chevrolet?

- Yes, extreme off-road driving, harsh conditions, or exposure to water and debris can potentially damage the Four Wheel Drive Low Switch Circuit components, leading to the triggering of OBDII code P2771 in a Chevrolet.