AutoCodes – Chevrolet – B1277 2017 Chevrolet Silverado

B1277 2017 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 2017 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.

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Code Popularity 284

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
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Code B1277 2017 Chevrolet Silverado 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 Chevrolet Silverado - Microphone 1 Input Signal Circuit - AutoCodes.com — B1277 2017 Chevrolet Silverado Code - Microphone 1 Input Signal Circuit

What does this mean?

What are the Possible Causes of the DTC B1277 2017 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 2017 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.

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 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.

Need more information about the B1277 2017 Chevrolet Silverado code?

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

Need Help with the Code?

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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 Chevrolet Silverado Code

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

- Common symptoms include a malfunctioning microphone, loss of voice command functionality, or issues with the vehicle's Bluetooth hands-free system.

2. What usually causes the OBDII code B1277 in a 2017 Chevrolet Silverado?

- The code B1277 typically indicates a problem with the Microphone 1 Input Signal Circuit, which may be caused by a faulty microphone, wiring issues, or a malfunctioning control module.

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

- Diagnosing the problem involves checking the microphone for physical damage, inspecting the wiring for any signs of wear or breakage, and using a diagnostic tool to assess the control module's functionality.

4. Can I repair the Microphone 1 Input Signal Circuit problem myself in a 2017 Chevrolet Silverado?

- Depending on your automotive repair skills and access to tools, you may be able to repair the Microphone 1 Input Signal Circuit issue yourself by replacing the microphone, repairing damaged wiring, or addressing control module issues.

5. How crucial is it to address OBDII code B1277 in a 2017 Chevrolet Silverado related to the Microphone 1 Input Signal Circuit?

- While the code may not affect the vehicle's drivability, addressing it is essential for restoring voice command functionality and ensuring proper operation of the Bluetooth hands-free system.

6. Are there any safety implications associated with OBDII code B1277 in a 2017 Chevrolet Silverado?

- The safety implications of this code are mainly related to the loss of hands-free communication features, which can affect driver concentration and increase distractions while driving.

7. How much does it typically cost to fix the Microphone 1 Input Signal Circuit issue triggering OBDII code B1277 in a 2017 Chevrolet Silverado?

- The cost of repair can vary depending on the specific cause of the issue, but it may involve expenses for parts such as a new microphone, wiring repairs, or potentially a control module replacement.

8. Can resetting the OBDII system clear the B1277 code in a 2017 Chevrolet Silverado?

- While clearing the code may temporarily remove the warning light, it is crucial to diagnose and address the underlying issue causing the B1277 code to prevent it from reoccurring.

9. Will the Microphone 1 Input Signal Circuit problem affect the overall performance of my 2017 Chevrolet Silverado?

- The issue typically does not impact the vehicle's performance but may hinder the functionality of certain communication and infotainment features.

10. How long does it take to repair the Microphone 1 Input Signal Circuit issue in a 2017 Chevrolet Silverado?

- The repair time can vary based on the specific problem and the complexity of the repair needed, ranging from a quick fix for minor issues to a more involved process for comprehensive repairs.