AutoCodes – Chevrolet – B127C 2017 Chevrolet Silverado

B127C 2017 Chevrolet Silverado Code - Microphone 2 Input Signal Circuit

Quick Answer

The active noise cancellation system uses three microphones in the vehicle headliner: one above each front seating position, and one above the rear seat. Common causes include Faulty Radio Volume Compensator Interior Noise Microphone, Radio Volume Compensator Interior Noise Microphone harness is open or shorted, Radio Volume Compensator Interior Noise Microphone circuit poor electrical connection. 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: B127C 2017 Chevrolet Silverado indicates Microphone 2 Input Signal Circuit.
Common causes: Common causes include Faulty Radio Volume Compensator Interior Noise Microphone, Radio Volume Compensator Interior Noise Microphone harness is open or shorted, Radio Volume Compensator Interior Noise Microphone circuit poor electrical connection.
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 223

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 B127C 2017 Chevrolet Silverado Description

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. The Diagnostic Trouble Code (DTC) will be set when a fault is detected on the specified (+) or (−) signal circuit for more than 1.5 seconds.

OBDII Code B127C 2017 Chevrolet Silverado - Microphone 2 Input Signal Circuit - AutoCodes.com — B127C 2017 Chevrolet Silverado Code - Microphone 2 Input Signal Circuit

What does this mean?

What are the Possible Causes of the DTC B127C 2017 Chevrolet Silverado?

Faulty Radio Volume Compensator Interior Noise Microphone
Radio Volume Compensator Interior Noise Microphone harness is open or shorted
Radio Volume Compensator Interior Noise Microphone circuit poor electrical connection
Faulty Audio Amplifier

How to Fix the DTC B127C 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 B127C 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 B127C 2017 Chevrolet Silverado 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 B127C 2017 Chevrolet Silverado Code

What does OBDII code B127C mean on a 2017 Chevrolet Silverado?

B127C refers to a fault in the Microphone 2 Input Signal Circuit, indicating an issue with the second microphone's input to the vehicle's infotainment or audio system.

What are the symptoms of code B127C in a 2017 Chevrolet Silverado?

Common symptoms include poor voice recognition performance, issues with hands-free calling, or no audio input from the second microphone.

What causes code B127C to appear?

This code can be triggered by a faulty microphone, damaged wiring, loose connections, or a malfunctioning infotainment control module.

How can I diagnose code B127C?

Start by inspecting the microphone and its wiring for damage or disconnection. Use a multimeter to check for continuity and proper voltage in the circuit.

Can I drive my 2017 Chevrolet Silverado with code B127C active?

Yes, the vehicle is still drivable, but hands-free calling and voice recognition features may be impaired.

How do I fix code B127C on a 2017 Chevrolet Silverado?

Repairs may include replacing the faulty microphone, repairing damaged wiring, reconnecting loose connections, or reprogramming/updating the infotainment module if necessary.

Can a software update fix code B127C?

In some cases, a software update to the infotainment system may resolve the issue if the problem is related to system programming.

How much does it cost to repair code B127C?

The repair cost varies depending on the issue, ranging from $50 for a simple wiring repair to over $300 if the microphone or infotainment module needs replacement.

Where is Microphone 2 located on a 2017 Chevrolet Silverado?

Microphone 2 is typically located near the vehicle's headliner, often integrated into the overhead console or rearview mirror assembly.

Do I need special tools to fix code B127C?

Basic tools like a multimeter are sufficient for diagnosing wiring issues, but a scan tool capable of reading manufacturer-specific codes may be required for troubleshooting and clearing the code.