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B1055 2018 GMC Sierra Code - Right Rear Door Audio Output 4 Circuit

Quick Answer

The B1055 diagnostic trouble code (DTC) for a 2018 GMC Sierra specifically refers to an issue with the Right Rear Door Audio Output 4 Circuit. Common causes include Loose or damaged wiring connections in the right rear door audio circuit, Faulty speaker in the right rear door, Malfunctioning amplifier or head unit sending signals to the right rear door audio 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
B1055 2018 GMC Sierra indicates Right Rear Door Audio Output 4 Circuit.
Common causes
Common causes include Loose or damaged wiring connections in the right rear door audio circuit, Faulty speaker in the right rear door, Malfunctioning amplifier or head unit sending signals to the right rear door audio 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 Sep 14, 2024
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Code B1055 2018 GMC Sierra Description

The B1055 diagnostic trouble code (DTC) for a 2018 GMC Sierra specifically refers to an issue with the Right Rear Door Audio Output 4 Circuit. This code indicates that there is a problem with the circuit responsible for transmitting audio signals to the speakers in the right rear door of the vehicle. When this circuit malfunctions, it can lead to a loss of sound from the speakers in that particular door, affecting the overall audio system performance in the vehicle.

OBDII Code B1055 2018 GMC Sierra - Right Rear Door Audio Output 4 Circuit
B1055 2018 GMC Sierra Code - Right Rear Door Audio Output 4 Circuit

Common Causes of B1055 2018 GMC Sierra

  1. Loose or damaged wiring connections in the right rear door audio circuit.
  2. Faulty speaker in the right rear door.
  3. Malfunctioning amplifier or head unit sending signals to the right rear door audio circuit.
  4. Water damage or corrosion affecting the connections in the right rear door audio circuit.
  5. Electrical issues such as a blown fuse or relay related to the right rear door audio circuit.

Symptoms of B1055 2018 GMC Sierra

  1. No sound coming from the right rear door speaker.
  2. Distorted or crackling sound from the right rear door speaker.
  3. Intermittent sound loss from the right rear door speaker.
  4. Audio system imbalance, with one side of the vehicle producing louder sound than the other.
  5. Error message or warning light on the audio system display indicating a fault.

How to Fix B1055 2018 GMC Sierra

  1. Begin by inspecting the wiring connections in the right rear door audio circuit for any signs of damage or looseness. Repair or replace any faulty wiring as needed.
  2. Test the speaker in the right rear door to determine if it is functioning correctly. Replace the speaker if it is found to be faulty.
  3. Check the amplifier or head unit for any issues that may be affecting the audio output to the right rear door. Repair or replace these components if necessary.
  4. Inspect for water damage or corrosion in the right rear door audio circuit and address any issues found.
  5. Reset the audio system and clear the DTC to see if the issue is resolved. If the code persists, further diagnostics may be required.

Cost to Fix B1055 2018 GMC Sierra

The cost of repairing the Right Rear Door Audio Output 4 Circuit issue can vary depending on the specific cause of the problem. In general, you can expect to pay anywhere from $100 to $300 for parts and labor. Keep in mind that labor rates at auto repair shops can range from $80 to $150 per hour, so the total cost may fluctuate based on your location and the shop you choose. It's recommended to consult with a professional technician to get an accurate estimate for your specific vehicle.

What does this mean?

Tech Notes for B1055 2018 GMC Sierra

B1055:01 Right Rear Door Audio Output 4 Circuit Short to Battery

B1055:02 Right Rear Door Audio Output 4 Circuit Short to Ground

B1055:04 Right Rear Door Audio Output 4 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 B1055 2018 GMC Sierra Code

1. What does the OBDII code B1055 mean for a 2018 GMC Sierra?

B1055 indicates an issue with the Right Rear Door Audio Output 4 Circuit, typically related to the audio system's wiring or components.

2. What are common symptoms of code B1055 in a 2018 GMC Sierra?

Common symptoms include no sound or distorted audio from the right rear speaker, or intermittent audio issues.

3. What causes the B1055 code to appear on a 2018 GMC Sierra?

Causes may include damaged wiring, a faulty speaker, a malfunctioning audio amplifier, or a defective connection in the audio system.

4. Can I still drive my 2018 GMC Sierra with the B1055 code active?

Yes, you can drive the vehicle, as this code does not affect drivability, but the audio system's performance may be impaired.

5. How do I diagnose the B1055 code on my 2018 GMC Sierra?

Start by inspecting the wiring and connectors for the right rear speaker, checking for damage, corrosion, or loose connections. Use a multimeter to test continuity in the circuit.

6. What tools are needed to fix code B1055 on a 2018 GMC Sierra?

You may need a multimeter, wiring diagrams for the audio system, basic hand tools, and possibly a replacement speaker or audio amplifier.

7. How much does it cost to repair the B1055 code on a 2018 GMC Sierra?

Repair costs vary depending on the issue. Replacing a speaker may cost $50-$150, while amplifier repairs or replacements could cost $200-$500.

8. Can a software update fix the B1055 code on a 2018 GMC Sierra?

In rare cases, a software update for the audio system may resolve the issue, but it is more likely caused by a hardware problem.

9. Is the B1055 code covered under warranty for a 2018 GMC Sierra?

It may be covered if your vehicle is still under the factory warranty and the issue is determined to be a manufacturing defect.

10. What happens if I ignore the B1055 code on my 2018 GMC Sierra?

Ignoring the code may lead to continued audio issues, but it is unlikely to cause further damage to the vehicle.

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