B1277 2014 Chevrolet Silverado 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 Chevrolet Silverado 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 Chevrolet Silverado 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 Chevrolet Silverado?
- 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 Chevrolet Silverado?
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 Chevrolet Silverado 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 Chevrolet Silverado Code
1. What does the OBDII code B1277 mean on a 2014 Chevrolet Silverado?
Code B1277 indicates an issue with the Microphone 1 Input Signal Circuit, often related to the wiring or functionality of the microphone used for the vehicle's hands-free or voice command system.
2. What are common symptoms of code B1277 in a Chevy Silverado?
Symptoms may include poor audio quality during calls, failure of voice recognition systems, or the hands-free feature not working properly.
3. What causes the B1277 code to appear?
Potential causes include a faulty microphone, damaged or disconnected wiring, a loose connector, or a problem with the infotainment system's control module.
4. Can a bad microphone cause code B1277?
Yes, a defective microphone is one of the primary causes of this code.
5. How can I diagnose the B1277 code?
Start by inspecting the microphone wiring and connector for damage or loose connections, then test the microphone for functionality. If no issues are found, check the infotainment system for faults.
6. Is it safe to drive with the B1277 code present?
Yes, the vehicle remains safe to drive, but features like hands-free calling or voice commands may not function correctly.
7. How do I fix a B1277 code on my Silverado?
Common repairs include replacing a damaged microphone, repairing or reconnecting faulty wiring, or updating/reprogramming the infotainment system.
8. Can software updates fix the B1277 code?
In some cases, an update to the vehicle's infotainment system software may resolve the issue if it is caused by a software glitch.
9. How much does it cost to repair the B1277 code?
Repair costs can vary, ranging from $50–$150 for a new microphone to higher costs if wiring repairs or module replacements are required.
10. Can I clear the B1277 code without repairing it?
You can clear the code with a scan tool, but it will likely return if the underlying issue isn't addressed.
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