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B3145 2018 Chevrolet Silverado Code - Passenger Door Unlock Switch Circuit

Quick Answer

The B3145 diagnostic trouble code (DTC) for the 2018 Chevrolet Silverado refers to a potential issue with the passenger door unlock switch circuit. Common causes include Wiring harness damage or corrosion, Faulty passenger door unlock switch, Defective door lock actuator. 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 Wiring harness damage or corrosion, Faulty passenger door unlock switch, Defective door lock actuator.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code B3145 2018 Chevrolet Silverado Description

The B3145 diagnostic trouble code (DTC) for the 2018 Chevrolet Silverado refers to a potential issue with the passenger door unlock switch circuit. This code indicates that there is a malfunction in the electrical circuit that controls the unlocking of the passenger side door. The passenger door unlock switch is an integral component of the door locking system, allowing the driver or passengers to unlock the door from inside the vehicle. When this circuit fails, it can result in the door being unable to unlock properly, which can pose safety risks and inconvenience to the occupants.

OBDII Code B3145 2018 Chevrolet Silverado - Passenger Door Unlock Switch Circuit
B3145 2018 Chevrolet Silverado Code - Passenger Door Unlock Switch Circuit

Common Causes of B3145 2018 Chevrolet Silverado

  1. Wiring harness damage or corrosion.
  2. Faulty passenger door unlock switch.
  3. Defective door lock actuator.
  4. Malfunctioning control module.
  5. Poor electrical connections.

Symptoms of B3145 2018 Chevrolet Silverado

  1. Inability to unlock the passenger door from inside the vehicle.
  2. Unresponsive passenger door unlock switch.
  3. Intermittent door locking/unlocking issues.
  4. Warning light on the dashboard indicating a door lock/unlock system fault.
  5. Audible clicking noise when attempting to unlock the passenger door.

How to Fix B3145 2018 Chevrolet Silverado

  1. Begin by conducting a thorough visual inspection of the wiring harness connected to the passenger door unlock switch to check for any visible damage or corrosion.
  2. Test the passenger door unlock switch using a multimeter to determine if it is functioning correctly. Replace the switch if necessary.
  3. Inspect the door lock actuator for any signs of malfunction and replace it if found to be faulty.
  4. Check the control module for any error codes and test its functionality. Replace the control module if it is determined to be the cause of the issue.
  5. Once the faulty component is identified and replaced, clear the DTC and test the passenger door unlock switch circuit to ensure proper operation.

Cost to Fix B3145 2018 Chevrolet Silverado

The typical repair costs for addressing a B3145 code on a 2018 Chevrolet Silverado can vary depending on the specific cause of the issue and the parts/labour rates in your area. In general, the cost of parts for this repair could range from $50 to $200, while labour costs may be between $100 and $300. Overall, the total repair cost could range from $150 to $500. It's important to note that these are rough estimates, and actual costs may differ based on individual circumstances. Additionally, factors such as diagnostic time and labour rates at auto repair shops can influence the final cost. Consider obtaining quotes from multiple reputable repair facilities to determine the most cost-effective solution for your specific situation.

What does this mean?

Tech Notes for B3145 2018 Chevrolet Silverado









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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.

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