B1277 2016 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 2016 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.
Code B1277 2016 GMC Sierra Description
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.
What are the Possible Causes of the DTC B1277 2016 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 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
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B1277 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.
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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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