B1277 2014 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 2014 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 2014 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 2014 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 2014 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 2014 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 2014 GMC Sierra Code
1. What does the OBDII code B1277 mean on a 2014 GMC Sierra?
B1277 indicates an issue with the Microphone 1 Input Signal Circuit, which is part of the vehicle's infotainment or hands-free communication system.
2. What are the symptoms of code B1277 in a 2014 GMC Sierra?
Symptoms may include poor or no audio input from the microphone, issues with voice commands, or malfunctioning hands-free call functionality.
3. What causes the B1277 code to trigger in the 2014 GMC Sierra?
Common causes include a faulty microphone, damaged wiring or connectors in the microphone circuit, or a malfunction in the infotainment system.
4. How can the B1277 code affect my 2014 GMC Sierra's functionality?
This code typically impacts the hands-free calling and voice command features, leading to reduced convenience and functionality in the infotainment system.
5. How do you diagnose the B1277 code on a 2014 GMC Sierra?
Diagnosis involves inspecting the microphone, checking the wiring and connectors for damage, and testing for continuity in the circuit. The infotainment system may also need testing.
6. Can a faulty microphone cause the B1277 code in my GMC Sierra?
Yes, a defective or damaged microphone is one of the most common causes of this code.
7. Is it safe to drive with the B1277 code in my 2014 GMC Sierra?
Yes, it is safe to drive with this code, as it does not affect essential vehicle functions. However, hands-free features may not work properly.
8. What are the repair options for a 2014 GMC Sierra with code B1277?
Repairs could include replacing the microphone, repairing or replacing damaged wiring, or updating/reprogramming the infotainment system.
9. How much does it cost to fix the B1277 code on a 2014 GMC Sierra?
Repair costs vary but typically range from $50 to $300, depending on whether the microphone, wiring, or infotainment system requires attention.
10. Can resetting the code fix the B1277 issue in my GMC Sierra?
Resetting the code may temporarily clear it, but the underlying issue must be resolved to prevent it from returning.
Discuss the causes and fixes for B1277 2014 GMC Sierra OBDII Code
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