B1055 2015 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 2015 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 2015 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 2015 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 2015 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 2015 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.
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Frequently Asked Questions about B1055 2015 GMC Sierra Code
1. What does the OBDII code B1055 mean on a 2015 GMC Sierra?
The B1055 code indicates an issue with the Right Rear Door Audio Output 4 Circuit, typically related to the audio signal or wiring for the rear right speaker.
2. What are common symptoms of the B1055 code in a GMC Sierra?
Symptoms may include no sound from the right rear speaker, distorted audio, or intermittent speaker operation.
3. What causes the B1055 code to trigger in a 2015 GMC Sierra?
The code can be caused by faulty wiring or connectors, a damaged speaker, or a malfunction in the audio amplifier or radio.
4. How can I diagnose the B1055 code on my GMC Sierra?
Start by inspecting the wiring and connectors for the right rear speaker, checking for damage, corrosion, or loose connections. You can also test the speaker and audio amplifier for proper functionality.
5. Can I still drive my GMC Sierra with the B1055 code present?
Yes, the B1055 code does not affect the drivability of your vehicle, but you may experience audio issues in the right rear speaker.
6. How do I fix the B1055 code on a 2015 GMC Sierra?
Repairs may include replacing a faulty speaker, repairing damaged wiring, cleaning corroded connectors, or replacing the audio amplifier if it is determined to be defective.
7. Will resetting the code fix the B1055 issue permanently?
Resetting the code may temporarily clear it, but if the underlying issue is not resolved, the code will return.
8. Does the B1055 code mean the right rear speaker is broken?
Not necessarily. While the speaker could be faulty, the issue may also lie in the wiring, connectors, or audio amplifier.
9. How much does it cost to repair the B1055 code on a GMC Sierra?
Costs can vary depending on the specific issue, but speaker replacement typically ranges from $50 to $200, while amplifier repairs or replacements can cost $300 or more.
10. Can I troubleshoot the B1055 code myself?
Yes, you can start by checking the wiring, connectors, and speaker for visible damage or testing the speaker with a multimeter. However, more complex issues may require professional diagnosis.
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