AutoCodes – Chevrolet – B3971 Chevrolet

B3971 Chevrolet Code - Folding Top Position Sensor

Quick Answer

The Folding Top Control (FTC) Module supplies accessory voltage to the top open and closed limit switches. Common causes include Faulty Folding Top Position Sensor, Folding Top Position Sensor harness is open or shorted, Folding Top Position Sensor 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: B3971 Chevrolet indicates Folding Top Position Sensor.
Common causes: Common causes include Faulty Folding Top Position Sensor, Folding Top Position Sensor harness is open or shorted, Folding Top Position Sensor 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 1,155

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 25, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3971 Chevrolet Description

The Folding Top Control (FTC) Module supplies accessory voltage to the top open and closed limit switches. It monitors the signal circuits of these switches to determine the open and closed position of the top. When the top is in the closed position the following definitions of the limit switches should be true: Top Closed Switch-The switch will be closed to voltage and the scan tool parameter should display Active and Top Open Switch-The switch will be open and the scan tool parameter should display Inactive. The FTC module will set B3971 as a current Diagnostic Trouble Code (DTC) if it senses that both the top open and top closed limit switches are active at the same time.

OBDII Code B3971 Chevrolet - Folding Top Position Sensor - AutoCodes.com — B3971 Chevrolet Code - Folding Top Position Sensor

What does this mean?

What are the Possible Causes of the DTC B3971 Chevrolet?

Faulty Folding Top Position Sensor
Folding Top Position Sensor harness is open or shorted
Folding Top Position Sensor circuit poor electrical connection
Faulty Folding Top Control (FTC) Module

How to Fix the DTC B3971 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 B3971 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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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 B3971 Chevrolet Code

1. What does the OBDII code B3971 mean on a Chevrolet?

The code B3971 indicates an issue with the Folding Top Position Sensor, which monitors the position of the convertible roof to ensure proper operation.

2. What are the common symptoms of code B3971?

Symptoms may include the convertible top not opening or closing properly, the top getting stuck mid-operation, or warning lights on the dashboard.

3. What causes the B3971 code to appear?

This code can be caused by a faulty Folding Top Position Sensor, damaged wiring or connectors, or issues with the convertible top mechanism itself.

4. How do I diagnose the B3971 code?

Diagnose the code by scanning with an OBDII tool, inspecting the Folding Top Position Sensor for damage or wear, and checking for any wiring or connector issues.

5. Can I drive my Chevrolet with the B3971 code?

Yes, you can drive the vehicle, but the convertible top may not function properly, and delaying repairs could lead to further damage.

6. How do I fix the B3971 code?

Repairs may involve replacing the Folding Top Position Sensor, repairing or replacing damaged wiring, or addressing mechanical issues in the folding top system.

7. How much does it cost to repair a B3971 code?

The repair cost depends on the extent of the issue, but replacing the Folding Top Position Sensor typically costs between $100 and $300, including parts and labor.

8. Can a bad Folding Top Position Sensor damage my vehicle?

While the sensor itself wonâ€™t cause major damage, ignoring the issue could lead to stress on the convertible top mechanism and potentially higher repair costs.

9. How can I prevent the B3971 code from recurring?

Regular maintenance, inspecting the folding top system for wear, and keeping the sensor and wiring free from debris can help prevent this code from recurring.

10. Is the Folding Top Position Sensor easy to replace?

Replacing the sensor can be relatively straightforward for those experienced with automotive repairs, but it may require specialized tools or knowledge of the convertible top system.