AutoCodes – GMC – B1277 2015 GMC Sierra

B1277 2015 GMC Sierra Code - Microphone 1 Input Signal Circuit

Quick Answer

For Cellular, Entertainment, and Navigation Systems: The Human Machine Interface Control Module uses the cellular telephone microphone for voice recognition and cellular features. Common causes include Faulty Cellular Phone Microphone (For Cellular, Entertainment, and Navigation Systems), Faulty Radio Volume Compensator Interior Noise Microphone (For Active Noise Cancellation System), Faulty Audio Amplifier (For Active Noise Cancellation System). 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: B1277 2015 GMC Sierra indicates Microphone 1 Input Signal Circuit.
Common causes: Common causes include Faulty Cellular Phone Microphone (For Cellular, Entertainment, and Navigation Systems), Faulty Radio Volume Compensator Interior Noise Microphone (For Active Noise Cancellation System), Faulty Audio Amplifier (For Active Noise Cancellation System).
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.

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Code Popularity 408

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 29, 2024

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B1277 2015 GMC Sierra Description

For Cellular, Entertainment, and Navigation Systems:
The Human Machine Interface Control Module uses the cellular telephone microphone for voice recognition and cellular features. The Human Machine Interface Control Module provides a bias voltage to each microphone (+) and (-) signal circuit for the operation of the microphone.
The radio provides the cellular phone microphone with a supplied voltage on the cellular phone microphone high signal circuit. When the microphone is in use, voice data from the user is sent back to the radio on the cellular microphone low signal circuit.

For Active Noise Cancellation System:
The active noise cancellation system uses three microphones in the vehicle headliner: one above each front seating position, and one above the rear seat. The Audio Amplifier provides a bias voltage to each microphone (+) and (-) signal circuit for the operation of the microphone. The microphones monitor the vehicle cabin for undesirable engine sounds. The Audio Amplifier uses the microphone inputs and an engine RPM signal to determine the frequency of the undesirable sound.

OBDII Code B1277 2015 GMC Sierra - Microphone 1 Input Signal Circuit - AutoCodes.com — B1277 2015 GMC Sierra Code - Microphone 1 Input Signal Circuit

What does this mean?

What are the Possible Causes of the DTC B1277 2015 GMC Sierra?

Faulty Cellular Phone Microphone (For Cellular, Entertainment, and Navigation Systems)
Faulty Radio Volume Compensator Interior Noise Microphone (For Active Noise Cancellation System)
Faulty Audio Amplifier (For Active Noise Cancellation System)
Faulty Human Machine Interface Control Module or Radio (For Cellular, Entertainment, and Navigation Systems)

How to Fix the DTC B1277 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.

What does this mean?

Code Tech Notes

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1277 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.

Need more information about the B1277 2015 GMC Sierra code?

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Need Help with the Code?

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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 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code B1277 on a 2015 GMC Sierra related to the Microphone 1 Input Signal Circuit?

The common symptoms include issues with the vehicle's hands-free calling system, such as no sound from the microphone or poor call quality.

2. What are some likely causes of OBDII code B1277 on a 2015 GMC Sierra related to the Microphone 1 Input Signal Circuit?

Possible causes include a faulty microphone, wiring issues, a defective audio control module, or a poor connection in the circuit.

3. How can I diagnose the issue causing OBDII code B1277 on my 2015 GMC Sierra related to the Microphone 1 Input Signal Circuit?

A thorough inspection of the microphone, wiring, and connections is recommended. Testing the microphone and checking for any visible damage to the wiring can help pinpoint the problem.

4. Is it possible to repair OBDII code B1277 on a 2015 GMC Sierra related to the Microphone 1 Input Signal Circuit without professional help?

While some basic troubleshooting like checking connections and wiring can be done by DIY enthusiasts, repairing or replacing components may require professional assistance.

5. Can a malfunctioning Microphone 1 Input Signal Circuit impact other vehicle systems on a 2015 GMC Sierra?

Yes, a faulty microphone or related circuitry can affect other systems that rely on audio input, such as the infotainment system or voice command features.

6. How much does it typically cost to repair OBDII code B1277 on a 2015 GMC Sierra related to the Microphone 1 Input Signal Circuit?

The cost of repair can vary depending on the exact cause of the issue. Simple fixes like repairing a loose connection may be inexpensive, while replacing a faulty microphone or module can be more costly.

7. Are there any temporary solutions to address OBDII code B1277 on a 2015 GMC Sierra related to the Microphone 1 Input Signal Circuit?

Temporary solutions like disconnecting and reconnecting the microphone or resetting the audio system may sometimes resolve minor issues, but a permanent fix will likely require proper diagnosis and repair.

8. How important is it to address OBDII code B1277 on a 2015 GMC Sierra related to the Microphone 1 Input Signal Circuit promptly?

Addressing the issue promptly is recommended to ensure the proper functioning of the hands-free calling system and to prevent any potential impact on other vehicle systems that rely on audio input.

9. Can weather conditions or external factors contribute to triggering OBDII code B1277 on a 2015 GMC Sierra related to the Microphone 1 Input Signal Circuit?

Extreme weather conditions or exposure to moisture can sometimes affect the microphone or wiring, leading to issues with the Microphone 1 Input Signal Circuit and triggering the OBDII code.

10. Is it possible to prevent OBDII code B1277 from recurring on a 2015 GMC Sierra related to the Microphone 1 Input Signal Circuit?

Regular maintenance checks, avoiding physical damage to the microphone or wiring, and addressing any issues promptly can help prevent the recurrence of OBDII code B1277 related to the Microphone 1 Input Signal Circuit.