AutoCodes – Chevrolet – B3140 Chevrolet

B3140 Chevrolet Code - Driver Door Unlock Switch Circuit

Quick Answer

The Body Control Module (BCM) monitors the voltage level of the door lock and door unlock signal circuits. Common causes include Faulty Driver Door Unlock Switch, Driver Door Unlock Switch harness is open or shorted, Driver Door Unlock 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: B3140 Chevrolet indicates Driver Door Unlock Switch Circuit.
Common causes: Common causes include Faulty Driver Door Unlock Switch, Driver Door Unlock Switch harness is open or shorted, Driver Door Unlock 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 2,708

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 Jun 11, 2023

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code B3140 Chevrolet Description

The Body Control Module (BCM) monitors the voltage level of the door lock and door unlock signal circuits. When the driver door lock switch is in the open position, the voltage level in the signal circuit will be near 12 V. When the driver door lock switch is pressed to the lock or unlock position, the voltage level in the appropriate signal circuit will drop to 0 V and the BCM will detect the voltage drop and command the door latches to perform the requested lock or unlock command. The Diagnostic Trouble Code (DTC) will be set when the BCM detects a short to ground in the switch circuit.

OBDII Code B3140 Chevrolet - Driver Door Unlock Switch Circuit - AutoCodes.com — B3140 Chevrolet Code - Driver Door Unlock Switch Circuit

What does this mean?

What are the Possible Causes of the DTC B3140 Chevrolet?

Faulty Driver Door Unlock Switch
Driver Door Unlock Switch harness is open or shorted
Driver Door Unlock Switch circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B3140 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 does this mean?

Code Tech Notes

User Submitted Video

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B3140 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.

Need more information about the B3140 Chevrolet code?

Need more information on how to fix the B3140 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B3140 Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

B3140 2014 Chevrolet Silverado — Driver Door Unlock Switch Circuit
B3140 2015 Chevrolet Silverado — Driver Door Unlock Switch Circuit
B3140 2016 Chevrolet Silverado — Driver Door Unlock Switch Circuit
B3140 2017 Chevrolet Silverado — Driver Door Unlock Switch Circuit
B3140 2018 Chevrolet Silverado — Driver Door Unlock 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 B3140 Chevrolet Code

1. What are the common symptoms of OBDII code B3140 in a Chevrolet related to the driver door unlock switch circuit?

The common symptoms include the inability to unlock the driver door using the switch, erratic behavior of the door lock system, or the driver door lock remaining stuck in a certain position.

2. What are the possible causes of OBDII code B3140 related to the driver door unlock switch circuit in a Chevrolet?

Possible causes include a faulty driver door unlock switch, damaged wiring or connectors in the circuit, a malfunctioning door lock actuator, or a problem with the body control module.

3. How can I diagnose the issue causing OBDII code B3140 in a Chevrolet's driver door unlock switch circuit?

You can start by checking the driver door unlock switch for proper operation, inspecting the wiring and connectors for any damage, testing the door lock actuator, and scanning the body control module for any related error codes.

4. Can I repair the driver door unlock switch circuit issue causing OBDII code B3140 in a Chevrolet myself?

Depending on your level of automotive repair experience, you may be able to repair the issue yourself by replacing the faulty switch, repairing damaged wiring or connectors, or addressing any other identified problems in the circuit.

5. Is it safe to continue driving my Chevrolet with OBDII code B3140 related to the driver door unlock switch circuit?

While the vehicle may still be operable with this issue, it is not advisable to ignore it as it can affect the convenience and safety of accessing the driver door. It is recommended to address the problem promptly.

6. Can OBDII code B3140 in a Chevrolet's driver door unlock switch circuit cause any other electrical issues in the vehicle?

While the code specifically relates to the driver door unlock switch circuit, electrical problems in one part of the vehicle can sometimes affect other systems. It is best to address the issue to prevent any potential further complications.

7. Is resetting the OBDII system an effective way to temporarily clear OBDII code B3140 in a Chevrolet?

Resetting the OBDII system may temporarily clear the code, but it will not fix the underlying issue causing the code to appear. It is important to diagnose and repair the problem to prevent the code from reoccurring.

8. How much does it typically cost to repair OBDII code B3140 related to the driver door unlock switch circuit in a Chevrolet at a repair shop?

The cost of repair can vary depending on the exact cause of the issue, the labor rates of the repair shop, and the cost of any necessary parts. It is recommended to obtain quotes from different shops for an accurate estimate.

9. Can extreme weather conditions, such as cold temperatures, contribute to triggering OBDII code B3140 in a Chevrolet's driver door unlock switch circuit?

Extreme weather conditions can sometimes affect electrical components in a vehicle, including the driver door unlock switch circuit. It is advisable to keep the vehicle protected from harsh weather and address any issues promptly.

10. Are there any preventive maintenance tips to help avoid OBDII code B3140 related to the driver door unlock switch circuit in a Chevrolet?

Regularly checking and maintaining the driver door unlock switch, inspecting the wiring for damage, and addressing any issues with the door lock system promptly can help prevent the occurrence of OBDII code B3140.