AutoCodes – Chevrolet – B127D 2014 Chevrolet Silverado

B127D 2014 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 2014 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 225

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 2014 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 2014 Chevrolet Silverado - Microphone 3 Input Signal Circuit - AutoCodes.com — B127D 2014 Chevrolet Silverado Code - Microphone 3 Input Signal Circuit

What does this mean?

What are the Possible Causes of the DTC B127D 2014 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 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.

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 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.

Need more information about the B127D 2014 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 2014 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code B127D on a 2014 Chevrolet Silverado?

- Common symptoms include issues with the microphone system, such as poor sound quality or complete loss of microphone functionality.

2. What can cause the OBDII code B127D to trigger in a 2014 Chevrolet Silverado?

- The code B127D is typically triggered by a fault in the Microphone 3 Input Signal Circuit, which can be caused by damaged wiring, a faulty microphone, or a problem with the audio system.

3. How can I diagnose the Microphone 3 Input Signal Circuit issue on my 2014 Chevrolet Silverado?

- To diagnose the issue, you can start by checking the wiring connections of the microphone, inspecting for any visible damage, and testing the microphone itself for functionality.

4. Can I repair the Microphone 3 Input Signal Circuit issue in my 2014 Chevrolet Silverado myself?

- Depending on your experience and tools, you may be able to repair the issue yourself by fixing any damaged wiring, replacing the faulty microphone, or troubleshooting the audio system components.

5. Is it safe to continue driving my 2014 Chevrolet Silverado with the OBDII code B127D active?

- While the code B127D is related to the microphone system, it is generally safe to continue driving the vehicle. However, it is recommended to address the issue promptly to avoid any inconvenience or potential safety concerns.

6. How much does it typically cost to repair the Microphone 3 Input Signal Circuit issue on a 2014 Chevrolet Silverado?

- The cost of repairing the Microphone 3 Input Signal Circuit issue can vary depending on the root cause of the problem and whether you choose to repair it yourself or take it to a professional mechanic. Costs may range from a few dollars for simple fixes to a few hundred dollars for more complex repairs.

7. Will resetting the OBDII code B127D on my 2014 Chevrolet Silverado make the issue go away permanently?

- Resetting the code may temporarily clear the error, but if the underlying issue in the Microphone 3 Input Signal Circuit is not addressed, the code is likely to reappear. It is important to diagnose and fix the root cause of the problem for a permanent solution.

8. Are there any recalls or technical service bulletins related to the OBDII code B127D in the 2014 Chevrolet Silverado?

- It is recommended to check with a Chevrolet dealership or online resources for any recalls or technical service bulletins related to the OBDII code B127D specifically for the 2014 Chevrolet Silverado model.

9. Can a faulty Microphone 3 Input Signal Circuit affect other systems in my 2014 Chevrolet Silverado?

- While the main impact of a faulty Microphone 3 Input Signal Circuit is on the microphone system, it may also affect the overall audio system functionality or features that rely on the microphone input, such as voice-activated controls.

10. How long does it typically take to repair the Microphone 3 Input Signal Circuit issue in a 2014 Chevrolet Silverado?

- The repair time for the Microphone 3 Input Signal Circuit issue can vary depending on the complexity of the problem and your familiarity with the repair process. Simple fixes may take a short time, while more involved repairs may require several hours or even a day.