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B3145 2018 GMC Sierra Code - Passenger Door Unlock Switch Circuit

Quick Answer

The B3145 diagnostic trouble code (DTC) for a 2018 GMC Sierra relates to the passenger door unlock switch circuit. Common causes include Faulty passenger door unlock switch, Wiring issues or damaged electrical connections, Corrosion or moisture in the circuit. 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 GMC Sierra indicates Passenger Door Unlock Switch Circuit.
Common causes
Common causes include Faulty passenger door unlock switch, Wiring issues or damaged electrical connections, Corrosion or moisture in the circuit.
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 Aug 19, 2024
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Code B3145 2018 GMC Sierra Description

The B3145 diagnostic trouble code (DTC) for a 2018 GMC Sierra relates to the passenger door unlock switch circuit. This code indicates that there is a malfunction in the circuit responsible for controlling the passenger door unlock switch. The vehicle's onboard computer system has detected an issue with the electrical signal or communication within this circuit, which can prevent the proper functioning of the switch.

OBDII Code B3145 2018 GMC Sierra - Passenger Door Unlock Switch Circuit
B3145 2018 GMC Sierra Code - Passenger Door Unlock Switch Circuit

Common Causes of B3145 2018 GMC Sierra

  1. Faulty passenger door unlock switch.
  2. Wiring issues or damaged electrical connections.
  3. Corrosion or moisture in the circuit.
  4. Malfunctioning door control module.
  5. Defective body control module.

Symptoms of B3145 2018 GMC Sierra

  1. Inability to unlock the passenger door using the switch.
  2. Unresponsive or intermittent functioning of the passenger door unlock switch.
  3. Illumination of the door unlock warning light on the dashboard.
  4. Audible clicking or buzzing noises when attempting to unlock the door.

How to Fix B3145 2018 GMC Sierra

  1. Begin by diagnosing the specific cause of the code using a diagnostic scanner to pinpoint the issue within the passenger door unlock switch circuit.
  2. Inspect the wiring and electrical connections related to the switch for any damage, corrosion, or loose connections.
  3. Test the passenger door unlock switch itself to determine if it is functioning properly or needs replacement.
  4. Check the door control module and body control module for any faults that may be affecting the circuit.
  5. Repair or replace components as needed, clear the DTC from the vehicle's computer system, and test the passenger door unlock switch to ensure proper functionality.

Cost to Fix B3145 2018 GMC Sierra

The typical repair costs for addressing a B3145 code on a 2018 GMC Sierra can vary depending on the specific cause of the issue and the cost of parts and labor. On average, the repair for this type of circuit-related problem may range from $150 to $400, including the cost of diagnostic testing, parts replacement, and labor. It's important to note that labor rates at auto repair shops can vary, so it's recommended to obtain quotes from multiple sources to determine the most cost-effective option for resolving this issue.

What does this mean?

Tech Notes for B3145 2018 GMC Sierra





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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 GMC Sierra Code

1. What are the common symptoms of OBDII code B3145 in a 2018 GMC Sierra related to the Passenger Door Unlock Switch Circuit?

The common symptoms include the passenger door not unlocking using the switch, faulty door lock operation, and potential issues with the central locking system.

2. What are the possible causes of OBDII code B3145 in a 2018 GMC Sierra?

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

3. How can I diagnose the Passenger Door Unlock Switch Circuit issue causing OBDII code B3145 in my 2018 GMC Sierra?

You can start by checking the passenger door unlock switch for proper operation, inspecting the wiring for any damage or loose connections, testing the door lock actuator, and scanning the vehicle for any other related fault codes.

4. Can I repair the Passenger Door Unlock Switch Circuit issue related to OBDII code B3145 in my 2018 GMC Sierra myself?

Depending on your level of automotive expertise, you may be able to repair the issue yourself by replacing the faulty switch, repairing any damaged wiring, or addressing other potential causes. However, it is recommended to consult a professional if you are unsure.

5. Will OBDII code B3145 in a 2018 GMC Sierra related to the Passenger Door Unlock Switch Circuit cause any safety concerns?

While the code itself may not pose immediate safety risks, a malfunctioning door lock system can compromise the security of your vehicle and may lead to inconvenience or potential safety hazards in certain situations.

6. How much does it typically cost to repair the Passenger Door Unlock Switch Circuit problem triggering OBDII code B3145 in a 2018 GMC Sierra?

The cost of repairs can vary depending on the exact cause of the issue, the parts needed for replacement, and the labor rates of the repair shop. It is advisable to obtain quotes from different service providers for an accurate estimate.

7. Is it possible for OBDII code B3145 in a 2018 GMC Sierra to be triggered intermittently by the Passenger Door Unlock Switch Circuit issue?

Yes, intermittent issues with the passenger door unlock switch or related components can lead to sporadic activation of the code. It is important to address the problem promptly to prevent further complications.

8. Can a faulty body control module cause OBDII code B3145 in a 2018 GMC Sierra related to the Passenger Door Unlock Switch Circuit?

Yes, a malfunctioning body control module can interfere with the proper operation of the passenger door unlock switch circuit, leading to the triggering of the code. Testing and potentially replacing the module may be necessary.

9. Are there any preventive maintenance measures I can take to avoid encountering OBDII code B3145 in my 2018 GMC Sierra?

Regularly inspecting the door lock system, ensuring proper maintenance of the switches and actuators, and addressing any issues promptly can help prevent the occurrence of code B3145 related to the Passenger Door Unlock Switch Circuit.

10. Can resetting the vehicle's computer system clear OBDII code B3145 in a 2018 GMC Sierra associated with the Passenger Door Unlock Switch Circuit?

While resetting the computer system may temporarily clear the code, it is crucial to diagnose and address the underlying issue causing the code to prevent it from reoccurring. Simply clearing the code without fixing the problem will not solve the root cause of the malfunction.

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