B1055 GMC 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 GMC 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 GMC 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 GMC?
- 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 GMC?
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
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B1055 GMC 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.
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Information for Specific GMC Models
- B1055 2014 GMC Sierra — Right Rear Door Audio Output 4 Circuit
- B1055 2015 GMC Sierra — Right Rear Door Audio Output 4 Circuit
- B1055 2016 GMC Sierra — Right Rear Door Audio Output 4 Circuit
- B1055 2017 GMC Sierra — Right Rear Door Audio Output 4 Circuit
- B1055 2018 GMC Sierra — Right Rear Door Audio Output 4 Circuit
Frequently Asked Questions about B1055 GMC Code
1. What are common symptoms of OBDII code B1055 GMC related to the right rear door audio output circuit?
The common symptoms include no sound from the right rear door speaker, distorted audio output, or complete audio system failure in the vehicle.
2. What are the possible causes of OBDII code B1055 GMC affecting the right rear door audio output circuit?
Possible causes include a faulty audio amplifier, damaged wiring in the right rear door, a malfunctioning speaker, or a problem with the audio head unit.
3. How can I diagnose the OBDII code B1055 GMC for the right rear door audio output circuit issue?
Diagnose by checking the wiring and connections in the right rear door, testing the speaker for functionality, inspecting the audio amplifier, and scanning the vehicle's audio system for faults.
4. Is it safe to continue driving with OBDII code B1055 GMC triggered for the right rear door audio output circuit?
It is generally safe to drive, but you may experience audio issues in the right rear door speaker until the problem is resolved.
5. How can I repair OBDII code B1055 GMC related to the right rear door audio output circuit?
Repair the issue by fixing any damaged wiring, replacing the faulty speaker or audio amplifier, or reprogramming the audio system to resolve the code.
6. Can a DIY enthusiast fix OBDII code B1055 GMC affecting the right rear door audio output circuit?
Depending on your experience with automotive repairs, you may be able to fix the issue yourself by following repair guides and using the right tools.
7. How much does it cost to repair OBDII code B1055 GMC for the right rear door audio output circuit at a mechanic or dealership?
The repair cost can vary based on the specific issue, but it may range from $100 to $500 or more, including parts and labor.
8. Will resetting the OBDII system clear the B1055 GMC code for the right rear door audio output circuit?
Resetting the OBDII system may temporarily clear the code, but it will reappear if the underlying issue causing the fault is not fixed.
9. Can extreme weather conditions cause OBDII code B1055 GMC to trigger for the right rear door audio output circuit?
Extreme weather conditions can potentially damage the wiring or components in the audio system, leading to the code being triggered.
10. How can I prevent OBDII code B1055 GMC from recurring for the right rear door audio output circuit?
Regularly inspect and maintain the audio components in your vehicle, avoid water damage to the audio system, and address any audio issues promptly to prevent the code from recurring.
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