AutoCodes – Chevrolet – B3140 2018 Chevrolet Silverado

B3140 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado 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.

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Code Popularity 203

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 Jun 11, 2023

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code B3140 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado - Driver Door Unlock Switch Circuit - AutoCodes.com — B3140 2018 Chevrolet Silverado Code - Driver Door Unlock Switch Circuit

What does this mean?

What are the Possible Causes of the DTC B3140 2018 Chevrolet Silverado?

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 2018 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 does this mean?

Code Tech Notes

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B3140 2018 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.

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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 B3140 2018 Chevrolet Silverado Code

1. What does the OBDII code B3140 mean on a 2018 Chevrolet Silverado?

B3140 indicates a problem with the Driver Door Unlock Switch Circuit, suggesting a fault in the electrical circuit responsible for unlocking the driverâ€™s door.

2. What are the common symptoms of code B3140 in a 2018 Chevrolet Silverado?

Symptoms may include the driverâ€™s door failing to unlock, intermittent unlocking issues, or the door lock switch not responding.

3. What causes the B3140 code in a Chevrolet Silverado?

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

4. How can I diagnose code B3140 on my Silverado?

Start by inspecting the wiring and connectors for damage or corrosion, testing the door unlock switch, and checking for proper operation of the door control module using a diagnostic scan tool.

5. Can a blown fuse cause the B3140 code?

Yes, a blown fuse in the door lock circuit can disrupt operation and trigger the B3140 code. Check the fuses related to the power door locks.

6. How do I fix the B3140 code on a 2018 Chevrolet Silverado?

Repairs may involve replacing the driver door unlock switch, repairing or replacing damaged wiring, or reprogramming or replacing the door control module.

7. Is the B3140 code serious?

While it doesnâ€™t affect drivability, it can be inconvenient and compromise security by preventing the driverâ€™s door from unlocking properly.

8. Can I clear the B3140 code without fixing the issue?

Clearing the code without addressing the issue is not recommended, as the problem will likely return if the underlying fault is not resolved.

9. How much does it cost to repair the B3140 code on a Silverado?

Costs vary depending on the root cause but may range from $50 to $200 for minor repairs, such as replacing a switch, to higher amounts if the door control module needs replacement.

10. Can the B3140 code be caused by water damage?

Yes, water intrusion in the door panel can corrode wiring or connectors, leading to circuit issues and triggering the B3140 code.