AutoCodes – Chevrolet – P2771 2017 Chevrolet Silverado

P2771 2017 Chevrolet Silverado 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 2017 Chevrolet Silverado 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 330

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 2017 Chevrolet Silverado 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 2017 Chevrolet Silverado - Four Wheel Drive Low Switch Circuit - AutoCodes.com — P2771 2017 Chevrolet Silverado Code - Four Wheel Drive Low Switch Circuit

What does this mean?

What are the Possible Causes of the DTC P2771 2017 Chevrolet Silverado?

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 2017 Chevrolet Silverado?

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 2017 Chevrolet Silverado 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.

Need more information about the P2771 2017 Chevrolet Silverado code?

Need more information on how to fix the P2771 2017 Chevrolet Silverado code? Get Access to Factory Service Manuals

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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 2017 Chevrolet Silverado Code

1. What are common symptoms of OBDII code P2771 in a 2017 Chevrolet Silverado?

- Common symptoms include the Four Wheel Drive (4WD) system not engaging or disengaging properly, illuminated 4WD warning light on the dashboard, and difficulty shifting into Four Wheel Drive Low mode.

2. What can cause the OBDII code P2771 in a 2017 Chevrolet Silverado?

- The code P2771 is typically triggered by a malfunction in the Four Wheel Drive Low Switch Circuit, which can be caused by a faulty 4WD low switch, wiring issues, or a problem with the transfer case control module.

3. How can I diagnose the OBDII code P2771 in my 2017 Chevrolet Silverado?

- To diagnose the code P2771, it is recommended to perform a thorough inspection of the Four Wheel Drive Low switch, check the wiring for any damage or loose connections, and use a diagnostic scan tool to retrieve additional fault codes and data.

4. Can I still drive my 2017 Chevrolet Silverado with the OBDII code P2771 active?

- It is not recommended to continue driving your vehicle with the P2771 code active, as it can lead to potential issues with the Four Wheel Drive system and compromise the vehicle's overall performance and safety.

5. What are the repair options for fixing the OBDII code P2771 in a 2017 Chevrolet Silverado?

- Repair options for addressing the P2771 code may include replacing the faulty 4WD low switch, repairing any damaged wiring, or reprogramming the transfer case control module. It is advisable to consult a qualified mechanic for proper diagnosis and repair.

6. How much does it typically cost to repair the OBDII code P2771 in a 2017 Chevrolet Silverado?

- The cost of repairing the P2771 code can vary depending on the specific cause of the issue and the labor rates in your area. On average, you can expect to pay anywhere from $200 to $500 for parts and labor.

7. Can I reset the OBDII code P2771 in my 2017 Chevrolet Silverado by disconnecting the battery?

- While disconnecting the battery may temporarily clear the fault code, it is not a recommended method for resolving the underlying issue causing the P2771 code. It is best to address the root cause of the problem to prevent it from reoccurring.

8. Is the OBDII code P2771 a common problem in 2017 Chevrolet Silverado vehicles?

- The P2771 code related to the Four Wheel Drive Low Switch Circuit is not as common as some other OBDII trouble codes, but it can still occur in 2017 Chevrolet Silverado vehicles due to various factors such as wear and tear or electrical issues.

9. Can a DIY enthusiast fix the OBDII code P2771 in a 2017 Chevrolet Silverado?

- While some DIY enthusiasts may have the skills to diagnose and repair the P2771 code, it is recommended to consult a professional mechanic, especially for complex electrical issues related to the Four Wheel Drive system in a 2017 Chevrolet Silverado.

10. How can I prevent the OBDII code P2771 from appearing again in my 2017 Chevrolet Silverado?

- To prevent the recurrence of the P2771 code, it is essential to ensure regular maintenance of the Four Wheel Drive system, address any warning signs promptly, and follow the manufacturer's recommended maintenance schedule for your 2017 Chevrolet Silverado.