B1277 Chevrolet 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 Chevrolet 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 Chevrolet 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 Chevrolet?
- 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 Chevrolet?
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 Chevrolet 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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Information for Specific Chevrolet Models
- B1277 2014 Chevrolet Silverado — Microphone 1 Input Signal Circuit
- B1277 2015 Chevrolet Silverado — Microphone 1 Input Signal Circuit
- B1277 2016 Chevrolet Silverado — Microphone 1 Input Signal Circuit
- B1277 2017 Chevrolet Silverado — Microphone 1 Input Signal Circuit
- B1277 2018 Chevrolet Silverado — Microphone 1 Input Signal Circuit
Frequently Asked Questions about B1277 Chevrolet Code
1. What are common symptoms of OBDII code B1277 in a Chevrolet related to the Microphone 1 Input Signal Circuit?
- Common symptoms include malfunctioning hands-free calling features, loss of voice command functionality, and issues with the microphone input in the vehicle.
2. What are some possible causes of OBDII code B1277 in a Chevrolet related to the Microphone 1 Input Signal Circuit?
- Potential causes may include a faulty microphone, damaged wiring or connectors in the circuit, a malfunctioning audio control module, or software glitches.
3. How can I diagnose the issue causing OBDII code B1277 in my Chevrolet related to the Microphone 1 Input Signal Circuit?
- To diagnose the problem, check the microphone for physical damage, inspect the wiring and connectors for any issues, and use diagnostic tools to test the audio control module and related components.
4. What are some repair tips for fixing OBDII code B1277 in a Chevrolet related to the Microphone 1 Input Signal Circuit?
- Repair tips may include replacing the microphone if it's faulty, repairing or replacing damaged wiring or connectors, resetting the audio control module, and updating software as needed.
5. Can I fix OBDII code B1277 related to the Microphone 1 Input Signal Circuit in my Chevrolet myself?
- Depending on your experience and tools available, you may be able to fix the issue yourself by following diagnostic procedures and repair instructions provided in the vehicle's service manual.
6. Is it safe to continue driving my Chevrolet with OBDII code B1277 related to the Microphone 1 Input Signal Circuit?
- While the code may not directly affect the drivability of the vehicle, it's recommended to address the issue promptly to ensure proper functioning of hands-free systems and avoid potential safety hazards.
7. Will resetting the OBDII code B1277 related to the Microphone 1 Input Signal Circuit in my Chevrolet make it go away permanently?
- Resetting the code may temporarily clear it, but if the underlying issue causing the code is not addressed, it is likely to reappear. Proper diagnosis and repair are necessary for a permanent fix.
8. Do I need specialized tools to diagnose OBDII code B1277 related to the Microphone 1 Input Signal Circuit in my Chevrolet?
- While specialized diagnostic tools may be helpful, basic tools such as a multimeter, wiring diagram, and OBDII scanner can also be used to diagnose the issue effectively.
9. Are there any recalls or technical service bulletins related to OBDII code B1277 in a Chevrolet concerning the Microphone 1 Input Signal Circuit?
- It's recommended to check with a Chevrolet dealership or online resources for any relevant recalls or technical service bulletins specific to this OBDII code to see if there are known issues or solutions.
10. Can extreme weather conditions affect the Microphone 1 Input Signal Circuit and trigger OBDII code B1277 in a Chevrolet?
- Yes, extreme temperatures, moisture, or humidity can potentially impact the microphone and related electrical components, leading to malfunctions and triggering the OBDII code.
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