AutoCodes – Chevrolet – B127D 2016 Chevrolet Silverado

B127D 2016 Chevrolet Silverado Code - Microphone 3 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: B127D 2016 Chevrolet Silverado indicates Microphone 3 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 200

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 B127D 2016 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 B127D 2016 Chevrolet Silverado - Microphone 3 Input Signal Circuit - AutoCodes.com — B127D 2016 Chevrolet Silverado Code - Microphone 3 Input Signal Circuit

What does this mean?

What are the Possible Causes of the DTC B127D 2016 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 B127D 2016 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 B127D 2016 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 B127D 2016 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 B127D 2016 Chevrolet Silverado Code

1. What does the OBDII code B127D mean on a 2016 Chevrolet Silverado?

The code B127D indicates an issue with the Microphone 3 Input Signal Circuit, which may involve a malfunction in the wiring, connections, or the microphone itself.

2. What are the symptoms of the B127D code in a 2016 Chevrolet Silverado?

Common symptoms include poor or no voice recognition, malfunctioning hands-free calling, or issues with interior sound detection by the vehicle's system.

3. What causes the B127D code to appear?

This code can be caused by a faulty microphone, damaged wiring or connectors, a software issue in the infotainment system, or a problem with the control module.

4. Can I still drive my 2016 Chevrolet Silverado with the B127D code?

Yes, you can still drive the vehicle, but features like hands-free calling or voice recognition may not function correctly.

5. How do I diagnose the B127D code in a 2016 Chevrolet Silverado?

Diagnosis involves inspecting the microphone wiring and connectors, testing the microphone for proper function, and checking for software updates or module issues.

6. How can I fix the B127D code in my 2016 Chevrolet Silverado?

Fixing this code may involve repairing or replacing damaged wiring, reconnecting loose connections, replacing the faulty microphone, or updating the infotainment system software.

7. Where is Microphone 3 located in a 2016 Chevrolet Silverado?

Microphone 3 is typically located in the headliner near the overhead console or sun visor, depending on the vehicle's trim and configuration.

8. Does clearing the B127D code solve the problem?

Clearing the code will reset it temporarily, but if the underlying issue isnâ€™t fixed, the code will likely return.

9. How much does it cost to repair the B127D code on a 2016 Chevrolet Silverado?

The repair cost depends on the issue, ranging from $50-$150 for minor wiring repairs to $200-$400 if the microphone or module needs replacement.

10. Is the B127D code covered under warranty for a 2016 Chevrolet Silverado?

It may be covered under the warranty if your vehicle is still within the bumper-to-bumper or extended warranty period. Check with your dealership for details.