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B1277 2016 GMC Sierra Code - Microphone 1 Input Signal Circuit

Quick Answer

The B1277 code for a 2016 GMC Sierra relates to an issue with the Microphone 1 Input Signal Circuit. Common causes include Faulty microphone, Wiring or connection issues in the microphone circuit, Water or moisture damage affecting the microphone. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
B1277 2016 GMC Sierra indicates Microphone 1 Input Signal Circuit.
Common causes
Common causes include Faulty microphone, Wiring or connection issues in the microphone circuit, Water or moisture damage affecting the microphone.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 06, 2024
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Code B1277 2016 GMC Sierra Description

The B1277 code for a 2016 GMC Sierra relates to an issue with the Microphone 1 Input Signal Circuit. This code indicates that there is a fault or malfunction in the circuit that receives input signals from the microphone. The microphone in a vehicle is typically used for hands-free calling, voice commands, or other audio-related functions. When this circuit is compromised, it can lead to a range of issues affecting the vehicle's communication and entertainment systems.

OBDII Code B1277 2016 GMC Sierra - Microphone 1 Input Signal Circuit
B1277 2016 GMC Sierra Code - Microphone 1 Input Signal Circuit

Common Causes of B1277 2016 GMC Sierra

  1. Faulty microphone.
  2. Wiring or connection issues in the microphone circuit.
  3. Water or moisture damage affecting the microphone.
  4. Software glitches in the vehicle's audio system.

Symptoms of B1277 2016 GMC Sierra

  1. Inability to make hands-free phone calls.
  2. Voice commands not working for navigation or audio controls.
  3. Poor audio quality during phone calls or audio playback.
  4. Error messages related to microphone input signal.

How to Fix B1277 2016 GMC Sierra

  1. Diagnose the issue by testing the microphone and checking the wiring for any faults.
  2. Replace the faulty microphone if necessary.
  3. Repair any damaged wiring or connections in the microphone circuit.
  4. Clear the error code from the vehicle's system and test the microphone functionality.
  5. Update the vehicle's software if needed to ensure proper integration of the new microphone.

Cost to Fix B1277 2016 GMC Sierra

The cost of repairing the Microphone 1 Input Signal Circuit issue can vary depending on the extent of the problem and the specific repairs needed. On average, the repair costs for this issue can range from $100 to $300, including parts and labor. It's important to note that diagnostic time and labor rates at auto repair shops can vary, so it's recommended to get a detailed estimate from a qualified mechanic.

What does this mean?

Tech Notes for B1277 2016 GMC Sierra

Installation of aftermarket replacement speakers, additional speakers/subwoofers, or aftermarket exhaust systems can cause undesirable behavior of the active noise cancellation system. The noise reduction microphones have foam blocks above them to seal the microphones and aid in the reduction of headliner vibration. Missing or out of place foam blocks can impact system performance.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B1277 2016 GMC Sierra Code

1. What does the OBDII code B1277 mean on a 2016 GMC Sierra?

Code B1277 indicates an issue with the Microphone 1 Input Signal Circuit, meaning the system has detected a fault in the microphone's input signal.

2. What are the symptoms of the B1277 code in a 2016 GMC Sierra?

Symptoms may include poor audio quality during hands-free calls, the voice recognition system not working properly, or the microphone being completely unresponsive.

3. What causes the B1277 code to appear on a 2016 GMC Sierra?

Common causes include a faulty microphone, damaged wiring or connectors, or a malfunction in the infotainment system.

4. How can I diagnose the B1277 code on my GMC Sierra?

Begin by inspecting the microphone and its wiring for visible damage. Use a scan tool to confirm the code and check for other related codes. Test the microphone circuit for continuity and proper function.

5. Can I still use my GMC Sierra normally with a B1277 code?

Yes, the vehicle can still be driven, but hands-free calling and voice recognition features may not work properly.

6. How do I fix the B1277 code on a 2016 GMC Sierra?

Repairs may involve replacing the microphone, repairing or replacing damaged wiring, or reprogramming the infotainment system if necessary.

7. How much does it cost to repair a B1277 code on a GMC Sierra?

The repair cost depends on the issue. Replacing a microphone can cost $50–$150, while wiring repairs or infotainment system work may cost more.

8. Can a faulty microphone cause other issues in a 2016 GMC Sierra?

Generally, no. A faulty microphone usually only affects voice-related features like hands-free calling and voice commands.

9. Is the B1277 code specific to GMC vehicles?

No, this code can appear on other GM vehicles with a similar microphone input system, but the exact repair process may vary.

10. Can I clear the B1277 code without fixing the issue?

You can clear the code with a scan tool, but it will likely return unless the underlying problem is resolved.

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