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B1045 2018 GMC Sierra Code - Left Rear Door Audio Output 3 Circuit

Quick Answer

The B1045 diagnostic trouble code for a 2018 GMC Sierra refers to an issue with the Left Rear Door Audio Output 3 Circuit. Common causes include Faulty left rear door speaker, Wiring issues in the left rear door audio circuit, Loose or corroded connections in the audio system. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means
B1045 2018 GMC Sierra indicates Left Rear Door Audio Output 3 Circuit.
Common causes
Common causes include Faulty left rear door speaker, Wiring issues in the left rear door audio circuit, Loose or corroded connections in the audio system.
Severity
Low - monitor the vehicle and repair when practical.
Can I drive?
The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
What is this?
Table of contents Created and updated by William Orellana on Sep 14, 2024
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Code B1045 2018 GMC Sierra Description

The B1045 diagnostic trouble code for a 2018 GMC Sierra refers to an issue with the Left Rear Door Audio Output 3 Circuit. This code indicates that there is a malfunction in the circuit responsible for delivering audio output from the vehicle's audio system to the left rear door speaker. This can result in a lack of sound or poor audio quality coming from the left rear speaker.

OBDII Code B1045 2018 GMC Sierra - Left Rear Door Audio Output 3 Circuit
B1045 2018 GMC Sierra Code - Left Rear Door Audio Output 3 Circuit

Common Causes of B1045 2018 GMC Sierra

  1. Faulty left rear door speaker
  2. Wiring issues in the left rear door audio circuit
  3. Loose or corroded connections in the audio system
  4. Malfunctioning audio control module
  5. Water damage or moisture intrusion affecting the left rear door audio components

Symptoms of B1045 2018 GMC Sierra

  1. No sound coming from the left rear speaker
  2. Distorted or crackling sound from the left rear speaker
  3. Inconsistent audio output from the left rear speaker
  4. Audio cutting in and out from the left rear speaker
  5. Error message on the audio system display related to the left rear door audio output

How to Fix B1045 2018 GMC Sierra

  1. Begin by inspecting the left rear door speaker for any visible damage or signs of malfunction. Replace the speaker if necessary.
  2. Check the wiring in the left rear door audio circuit for any breaks, frays, or corrosion. Repair or replace damaged wiring as needed.
  3. Inspect and clean all connections in the audio system, including those related to the left rear door audio output. Ensure that connections are secure and free of debris.
  4. Test the audio control module for proper function and replace it if it is found to be faulty.
  5. Address any water damage or moisture intrusion in the left rear door audio components by drying out the affected areas and sealing them to prevent future issues.

Cost to Fix B1045 2018 GMC Sierra

The typical repair costs for addressing a B1045 code related to the Left Rear Door Audio Output 3 Circuit in a 2018 GMC Sierra can vary depending on the specific cause of the issue. On average, you can expect to pay between $100 to $300 for parts and labor. However, it's important to note that diagnostic time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's recommended to check with local repair shops for a more accurate estimate.

What does this mean?

Tech Notes for B1045 2018 GMC Sierra

B1045:01 Left Rear Door Audio Output 3 Circuit Short to Battery

B1045:02 Left Rear Door Audio Output 3 Circuit Short to Ground

B1045:04 Left Rear Door Audio Output 3 Circuit Open









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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 B1045 2018 GMC Sierra Code

1. What does the OBDII code B1045 mean on a 2018 GMC Sierra?

The code B1045 indicates an issue with the Left Rear Door Audio Output 3 Circuit, which is related to the audio system in the vehicle.

2. What are the common symptoms of code B1045 in a 2018 GMC Sierra?

Common symptoms include no sound or distorted audio from the left rear door speaker or intermittent audio performance.

3. What causes the B1045 code to appear on a 2018 GMC Sierra?

This code is typically caused by a faulty speaker, damaged wiring, a poor connection, or an issue with the amplifier or audio control module.

4. Can a blown speaker trigger the B1045 code?

Yes, a blown or damaged left rear door speaker can trigger this code due to an open or shorted circuit.

5. How can I diagnose the B1045 code in my 2018 GMC Sierra?

Diagnose the issue by inspecting the left rear door speaker, checking the wiring and connectors for damage, and testing the circuit for continuity or shorts.

6. Is the amplifier a potential cause of the B1045 code in a 2018 GMC Sierra?

Yes, a malfunctioning amplifier can cause this code if it fails to properly send audio signals to the left rear door speaker.

7. Can I still drive my vehicle with the B1045 code?

Yes, the vehicle can still be driven, but you may experience audio issues from the left rear door speaker.

8. How do I fix the B1045 code on a 2018 GMC Sierra?

Fixes include replacing the faulty speaker, repairing damaged wiring, ensuring proper connections, or replacing the amplifier if necessary.

9. Can clearing the code resolve the problem?

Clearing the code may temporarily remove the warning, but the underlying issue must be fixed to prevent the code from returning.

10. Should I take my 2018 GMC Sierra to a professional for the B1045 code?

If you're unable to diagnose or repair the issue yourself, it’s recommended to take the vehicle to a professional technician for further inspection.

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