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B1045 2015 GMC Sierra Code - Left Rear Door Audio Output 3 Circuit

Quick Answer

The B1045 diagnostic trouble code (DTC) for a 2015 GMC Sierra specifically refers to the "Left Rear Door Audio Output 3 Circuit." This code indicates that there is a malfunction in the audio output circuitry located in the left rear door of the vehicle. Common causes include Damaged or frayed wiring in the left rear door, Loose or corroded connectors in the audio system, Faulty speaker in the left rear door. 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 2015 GMC Sierra indicates Left Rear Door Audio Output 3 Circuit.
Common causes
Common causes include Damaged or frayed wiring in the left rear door, Loose or corroded connectors in the audio system, Faulty speaker in the left rear door.
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 12, 2024
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Code B1045 2015 GMC Sierra Description

The B1045 diagnostic trouble code (DTC) for a 2015 GMC Sierra specifically refers to the "Left Rear Door Audio Output 3 Circuit." This code indicates that there is a malfunction in the audio output circuitry located in the left rear door of the vehicle. This issue can have various implications for the vehicle's audio system, affecting the sound output from speakers in that particular area.

OBDII Code B1045 2015 GMC Sierra - Left Rear Door Audio Output 3 Circuit
B1045 2015 GMC Sierra Code - Left Rear Door Audio Output 3 Circuit

Common Causes of B1045 2015 GMC Sierra

  1. Damaged or frayed wiring in the left rear door
  2. Loose or corroded connectors in the audio system
  3. Faulty speaker in the left rear door
  4. Malfunctioning amplifier for the left rear door speakers
  5. Water damage or moisture intrusion affecting the audio components

Symptoms of B1045 2015 GMC Sierra

  1. No sound output from the left rear door speakers
  2. Distorted or crackling sound from the left rear door speakers
  3. Intermittent sound cutting in and out from the left rear door speakers
  4. Audio imbalance between left and right rear door speakers
  5. Error message or warning on the audio system display

How to Fix B1045 2015 GMC Sierra

  1. Begin by inspecting the wiring and connectors in the left rear door for any visible damage or corrosion. Repair or replace any damaged components.
  2. Check the speaker in the left rear door for functionality. If the speaker is faulty, replace it with a new one.
  3. Test the amplifier for the left rear door speakers to ensure it is functioning correctly. Replace the amplifier if necessary.
  4. Clear the diagnostic trouble code from the vehicle's system using an OBD-II scanner.
  5. Test the audio system to verify that the issue has been resolved and that sound is now properly outputting from the left rear door speakers.

Cost to Fix B1045 2015 GMC Sierra

The cost of repairing the Left Rear Door Audio Output 3 Circuit issue in a 2015 GMC Sierra can vary depending on the specific cause of the problem and the parts and labor required for the repair. Generally, the cost of parts such as wiring, connectors, speakers, or amplifiers can range from $50 to $200 or more, depending on the quality and brand of the components. Labor costs can also fluctuate between $80 and $150 per hour at most auto repair shops.

What does this mean?

Tech Notes for B1045 2015 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 2015 GMC Sierra Code

1. What does the OBDII code B1045 mean on a 2015 GMC Sierra?

B1045 indicates an issue with the Left Rear Door Audio Output 3 Circuit, which is responsible for transmitting audio signals to the left rear door speaker.

2. What are common symptoms of the B1045 code in a 2015 GMC Sierra?

Symptoms may include no sound or distorted audio from the left rear door speaker and possible chime or alert malfunctions.

3. What causes the B1045 code to appear?

The code can be caused by a faulty speaker, damaged wiring or connections in the audio circuit, or a malfunctioning amplifier or audio control module.

4. How can I diagnose the B1045 code on my GMC Sierra?

Start by inspecting the left rear door speaker and its wiring for damage. Use a scan tool to read live data and test the circuit’s continuity and resistance.

5. Can a faulty left rear door speaker trigger the B1045 code?

Yes, a damaged or non-functional speaker can disrupt the audio circuit and trigger the B1045 code.

6. Is it safe to drive with the B1045 code active?

Yes, it’s generally safe to drive, but you may experience audio or chime issues that could affect alert notifications.

7. How do I fix the B1045 code in a 2015 GMC Sierra?

Repairs may include replacing the left rear door speaker, repairing damaged wiring, or replacing the amplifier or audio control module if they are faulty.

8. How much does it cost to fix the B1045 code?

Repair costs vary depending on the issue, but replacing a speaker typically costs $50–$150, while wiring or module repairs can range higher.

9. Can resetting the code fix the B1045 issue?

Clearing the code may temporarily erase it, but if the underlying issue isn’t resolved, the code will likely return.

10. Does the B1045 code affect other vehicle systems?

The code primarily affects the audio system, but it may also interfere with audible alerts or warnings reliant on the left rear speaker.

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