AutoCodes – Chevrolet – B3145 2018 Chevrolet Silverado

B3145 2018 Chevrolet Silverado Code - Passenger 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 Passenger Door Unlock Switch, Passenger Door Unlock Switch harness is open or shorted, Passenger 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: B3145 2018 Chevrolet Silverado indicates Passenger Door Unlock Switch Circuit.
Common causes: Common causes include Faulty Passenger Door Unlock Switch, Passenger Door Unlock Switch harness is open or shorted, Passenger 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 195

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 B3145 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 B3145 2018 Chevrolet Silverado - Passenger Door Unlock Switch Circuit - AutoCodes.com — B3145 2018 Chevrolet Silverado Code - Passenger Door Unlock Switch Circuit

What does this mean?

What are the Possible Causes of the DTC B3145 2018 Chevrolet Silverado?

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

How to Fix the DTC B3145 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 B3145 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 B3145 2018 Chevrolet Silverado Code

1. What does the OBDII code B3145 mean on a 2018 Chevrolet Silverado?

B3145 indicates a problem with the passenger door unlock switch circuit, which could involve a malfunction in the wiring, switch, or associated components.

2. What are the symptoms of code B3145 in a 2018 Chevrolet Silverado?

Common symptoms include the passenger door failing to unlock, intermittent operation of the unlock switch, or no response when pressing the unlock button.

3. What causes the B3145 code to appear?

Possible causes include a faulty passenger door unlock switch, damaged wiring or connectors, a short or open circuit, or a malfunctioning body control module (BCM).

4. Can a bad BCM cause the B3145 code?

Yes, a malfunctioning body control module (BCM) can contribute to the B3145 code by failing to properly process signals from the unlock switch.

5. How do you diagnose a B3145 code on a 2018 Chevrolet Silverado?

Start by inspecting the passenger door unlock switch, checking for damaged wiring or loose connections. Use a scan tool to monitor the BCM and test the circuit for continuity or shorts.

6. Can you still lock and unlock the passenger door manually with a B3145 code?

Yes, manual locking and unlocking should still work, but the electronic unlock function may be impaired.

7. Is it safe to drive with a B3145 code on a 2018 Chevrolet Silverado?

While the vehicle is safe to drive, the issue may compromise convenience and security by preventing the passenger door from unlocking electronically.

8. How can I fix the B3145 code on my 2018 Chevrolet Silverado?

Repairs may involve replacing the passenger door unlock switch, repairing damaged wiring, securing loose connections, or reprogramming or replacing the BCM.

9. How much does it cost to fix the B3145 code on a Chevrolet Silverado?

Repair costs vary depending on the issue but can range from $50-$150 for a switch replacement to $300 or more if the BCM needs replacement or reprogramming.

10. Can a software update fix the B3145 code on a 2018 Chevrolet Silverado?

In some cases, a BCM software update may resolve the issue if the problem is due to a programming error. Check with a dealership or qualified technician.