B1085 2016 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 2016 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 2016 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 2016 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 2016 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 2016 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 2016 GMC Sierra code?
Need more information on how to fix the B1085 2016 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the B1085 2016 GMC Sierra code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about B1085 2016 GMC Sierra Code
1. What does OBDII code B1085 mean on a 2016 GMC Sierra?
Code B1085 indicates an issue with the Left Front Instrument Panel Audio Output 7 Circuit, which is related to the audio system's wiring or components.
2. What are common symptoms of code B1085 in a 2016 GMC Sierra?
Symptoms may include no sound or distorted audio from the left front speaker, possible static noise, or a complete failure of the audio system.
3. What causes the B1085 code to be triggered?
The code is typically caused by a damaged or disconnected speaker wire, a faulty speaker, a defective audio amplifier, or a software issue in the vehicle's audio system.
4. Can a blown fuse cause the B1085 code?
While a blown fuse could potentially affect the audio system, this specific code is more often related to wiring or component failures in the left front audio circuit.
5. How do you diagnose the B1085 code on a 2016 GMC Sierra?
Diagnose by inspecting the left front speaker and its wiring for damage or disconnection, testing the audio amplifier, and checking for any related software updates or faults.
6. Can the B1085 code affect other vehicle systems?
No, this code is specific to the audio circuit for the left front speaker and does not typically impact other vehicle systems.
7. How can you fix the B1085 code on a 2016 GMC Sierra?
Fix the issue by repairing or replacing damaged wiring, replacing a faulty speaker, or addressing issues with the audio amplifier or control module.
8. Is it safe to drive with the B1085 code active?
Yes, it is safe to drive with this code active, but the audio system may not function properly, which could be an inconvenience.
9. Can resetting the audio system clear the B1085 code?
In some cases, resetting the audio system or disconnecting the battery may temporarily clear the code, but underlying issues must be addressed to prevent it from returning.
10. What tools are needed to troubleshoot the B1085 code?
You may need a multimeter to check wiring continuity, a scan tool to read and clear codes, and potentially access to the vehicle's wiring diagrams for troubleshooting.
Discuss the causes and fixes for B1085 2016 GMC Sierra OBDII Code
Code B1085 2016 GMC Sierra comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
