B1085 2014 GMC Sierra Code - Left Front Instrument Panel Audio Output 7 Circuit
Quick Answer
The Media Oriented Systems Transport (MOST) is a high-speed multimedia network technology. Common causes include Faulty Audio Amplifier, Faulty Left Front Instrument Panel Speaker, Left Front Instrument Panel Speaker harness is open or shorted. 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
- B1085 2014 GMC Sierra indicates Left Front Instrument Panel Audio Output 7 Circuit.
- Common causes
- Common causes include Faulty Audio Amplifier, Faulty Left Front Instrument Panel Speaker, Left Front Instrument Panel Speaker harness is open or shorted.
- 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 B1085 2014 GMC Sierra Description
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 B1085 2014 GMC Sierra?
- Faulty Audio Amplifier
- Faulty Left Front Instrument Panel Speaker
- Left Front Instrument Panel Speaker harness is open or shorted
- Left Front Instrument Panel Speaker circuit poor electrical connection
How to Fix the DTC B1085 2014 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
B1085:02 Left Front Instrument Panel Audio Output 7 Circuit Short to Ground
B1085:04 Left Front Instrument Panel Audio Output 7 Circuit Open
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B1085 2014 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 B1085 2014 GMC Sierra code?
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Frequently Asked Questions about B1085 2014 GMC Sierra Code
1. What does the OBDII code B1085 mean on a 2014 GMC Sierra?
The B1085 code indicates an issue with the Left Front Instrument Panel Audio Output 7 Circuit, which is related to the audio system.
2. What are the common symptoms of a B1085 code?
Symptoms may include no sound from the left front speaker, distorted audio, or intermittent audio issues.
3. What are the possible causes of a B1085 code?
The code can be caused by a faulty speaker, damaged wiring or connectors, a malfunctioning audio amplifier, or a software issue in the radio or infotainment system.
4. Can a blown fuse cause the B1085 code?
A blown fuse is unlikely to cause this specific code, but it's still worth checking the fuses related to the audio system as part of the diagnosis.
5. How do I diagnose the B1085 code?
Start by inspecting the speaker and wiring for damage or loose connections. Use a multimeter to test for continuity in the circuit and check for proper voltage and ground.
6. Can I continue driving with a B1085 code?
Yes, the vehicle is safe to drive, but you may experience audio issues that could affect functionality or comfort.
7. How do I fix the B1085 code?
Repairs may involve replacing a faulty speaker, repairing or replacing damaged wiring, or updating/reprogramming the audio system software.
8. Can an aftermarket audio system trigger the B1085 code?
Yes, improperly installed aftermarket audio components can interfere with the circuit and trigger this code.
9. How much does it cost to repair the B1085 code?
The cost varies depending on the cause but may range from $50 to $200 for wiring repairs or speaker replacement, and up to $500 if the audio amplifier needs replacement.
10. Can a software update fix the B1085 code?
In some cases, a software update or reprogramming of the infotainment system may resolve the issue if it’s caused by a software glitch.
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