B1055 2018 GMC Sierra Code - Right Rear Door Audio Output 4 Circuit
Quick Answer
Vehicles without Amplifier: Each of the audio output channel circuits (+) and (-), at the radio have a DC bias voltage that is approximately one-half of battery voltage. Common causes include Faulty Radio Unit, Faulty Audio Amplifier (If equipped), Faulty Right Rear Door Speaker. 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
- B1055 2018 GMC Sierra indicates Right Rear Door Audio Output 4 Circuit.
- Common causes
- Common causes include Faulty Radio Unit, Faulty Audio Amplifier (If equipped), Faulty Right Rear Door Speaker.
- 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.
Code B1055 2018 GMC Sierra Description
Each of the audio output channel circuits (+) and (-), at the radio have a DC bias voltage that is approximately one-half of battery voltage. When using a DMM, each of the audio output channel circuits will measure approximately 6.5 V DC. The audio being played on the system is produced by a varying AC voltage that is centered around the DC bias voltage on the same circuit. The AC voltage is what causes the speaker cone to move and produce sound. The frequency (Hz) of the AC voltage signal is directly related to the frequency of the input (audio source playing) to the audio system. Both the DC bias voltage and the AC voltage signals are needed for the audio system to properly produce sound.
Vehicles with Amplifier:
The Media Oriented Systems Transport (MOST) is a high-speed multimedia network technology. The serial MOST bus uses a ring topology and synchronous data communication to transmit audio, video, data and control information between any devices attached.
The audio amplifier is a participant on the MOST network. The audio amplifier receives audio input and control information from the MOST bus.
Each of the audio output channel circuits (+) and (−), at the audio amplifier have a DC bias voltage that is approximately one-half of the battery voltage. When using a DMM, each of the audio output channel circuits will measure approximately 6.5V DC. The audio being played on the system is produced by a varying AC voltage that is centered around the DC bias voltage on the same circuit. The AC voltage is what causes the speaker cone to move and produce sound.
What are the Possible Causes of the DTC B1055 2018 GMC Sierra?
- Faulty Radio Unit
- Faulty Audio Amplifier (If equipped)
- Faulty Right Rear Door Speaker
- Right Rear Door Speaker harness is open or shorted
- Right Rear Door Speaker circuit poor electrical connection
How to Fix the DTC B1055 2018 GMC Sierra?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
B1055:02 Right Rear Door Audio Output 4 Circuit Short to Ground
B1055:04 Right Rear Door Audio Output 4 Circuit Open
User Submitted Video
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B1055 2018 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the B1055 2018 GMC Sierra code?
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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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