AutoCodes – GMC – B1277 2017 GMC Sierra

B1277 2017 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 2017 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 183

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code B1277 2017 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 2017 GMC Sierra - Microphone 1 Input Signal Circuit - AutoCodes.com — B1277 2017 GMC Sierra Code - Microphone 1 Input Signal Circuit

What does this mean?

What are the Possible Causes of the DTC B1277 2017 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 2017 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 2017 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 2017 GMC Sierra code?

Need more information on how to fix the B1277 2017 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1277 2017 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 2017 GMC Sierra Code

1. What are the common symptoms of OBDII code B1277 in a 2017 GMC Sierra related to the Microphone 1 Input Signal Circuit?

- Common symptoms include issues with hands-free calling, voice command recognition, and Bluetooth audio in the vehicle.

2. What are the possible causes of OBDII code B1277 in a 2017 GMC Sierra?

- The code B1277 typically indicates a fault in the Microphone 1 Input Signal Circuit, which can be caused by a faulty microphone, wiring issues, or a problem with the audio system.

3. How can I diagnose the Microphone 1 Input Signal Circuit issue triggering OBDII code B1277 in my 2017 GMC Sierra?

- A thorough inspection of the microphone, checking the wiring connections, and testing the audio system can help pinpoint the exact cause of the problem.

4. Can I repair the Microphone 1 Input Signal Circuit issue causing OBDII code B1277 in my 2017 GMC Sierra myself?

- Depending on your experience and access to tools, you may be able to repair the issue yourself by replacing the faulty microphone, repairing wiring issues, or troubleshooting the audio system.

5. Is it safe to continue driving my 2017 GMC Sierra with OBDII code B1277 related to the Microphone 1 Input Signal Circuit?

- While the vehicle may still be operable, it is recommended to address the issue promptly to ensure proper functioning of hands-free features and avoid potential audio system problems.

6. Will resetting the OBDII code B1277 in my 2017 GMC Sierra temporarily resolve the Microphone 1 Input Signal Circuit issue?

- Resetting the code may temporarily clear the warning light, but if the underlying issue causing the code is not fixed, it is likely to reoccur.

7. How much does it typically cost to repair the Microphone 1 Input Signal Circuit problem triggering OBDII code B1277 in a 2017 GMC Sierra?

- The cost of repair can vary depending on the exact cause of the issue, but it may involve expenses for diagnostic testing, parts replacement, and labor.

8. Are there any common DIY solutions to troubleshoot OBDII code B1277 in a 2017 GMC Sierra related to the Microphone 1 Input Signal Circuit?

- DIY solutions may include checking and cleaning microphone connections, inspecting wiring for damage, and testing the audio system settings before seeking professional help.

9. Can extreme weather conditions impact the Microphone 1 Input Signal Circuit and trigger OBDII code B1277 in a 2017 GMC Sierra?

- Extreme temperatures or moisture exposure can potentially affect the functionality of the microphone and wiring, leading to issues with the Microphone 1 Input Signal Circuit.

10. How can I prevent future occurrences of OBDII code B1277 in my 2017 GMC Sierra due to Microphone 1 Input Signal Circuit problems?

- Regularly inspecting and maintaining the microphone and audio system components, as well as keeping the vehicle protected from extreme weather conditions, can help prevent the recurrence of the issue.