AutoCodes – Chevrolet – B127D 2018 Chevrolet Silverado

B127D 2018 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 2018 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 323

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 2018 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 2018 Chevrolet Silverado - Microphone 3 Input Signal Circuit - AutoCodes.com — B127D 2018 Chevrolet Silverado Code - Microphone 3 Input Signal Circuit

What does this mean?

What are the Possible Causes of the DTC B127D 2018 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 2018 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 2018 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 2018 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 2018 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code B127D in a 2018 Chevrolet Silverado related to the Microphone 3 Input Signal Circuit?

- Common symptoms include issues with hands-free calling, voice recognition, or other related functions in the vehicle's communication system.

2. What can cause the OBDII code B127D to appear in a 2018 Chevrolet Silverado?

- The code B127D typically indicates a fault in the Microphone 3 Input Signal Circuit, which can be caused by wiring issues, a faulty microphone, or a problem with the vehicle's entertainment system.

3. How can I diagnose the Microphone 3 Input Signal Circuit issue triggering code B127D in my 2018 Chevrolet Silverado?

- To diagnose the issue, you may need to inspect the microphone wiring for any damage, test the microphone itself for functionality, and check the connections to the vehicle's entertainment system.

4. Are there any simple troubleshooting steps I can take to address the OBDII code B127D in my 2018 Chevrolet Silverado?

- You can start by checking the microphone connections, ensuring they are secure and free of corrosion. Additionally, resetting the vehicle's entertainment system or performing a software update may help resolve the issue.

5. Can I repair the Microphone 3 Input Signal Circuit problem causing code B127D in my 2018 Chevrolet Silverado myself?

- Depending on your skill level and access to tools, you may be able to address the issue yourself by checking connections, replacing the microphone if necessary, or seeking guidance from a repair manual.

6. Is it safe to continue driving my 2018 Chevrolet Silverado with the OBDII code B127D related to the Microphone 3 Input Signal Circuit?

- While the code itself may not affect the vehicle's drivability, it is recommended to address the underlying issue promptly to ensure proper functioning of the communication system and related features.

7. How much does it typically cost to repair the Microphone 3 Input Signal Circuit problem associated with code B127D in a 2018 Chevrolet Silverado?

- The cost of repair can vary depending on the exact cause of the issue. Simple fixes like checking connections may be inexpensive, while replacing a faulty microphone or addressing wiring problems could be more costly.

8. Will resetting the OBDII code B127D in my 2018 Chevrolet Silverado temporarily resolve the Microphone 3 Input Signal Circuit issue?

- Resetting the code may temporarily clear the error message, but if the underlying problem is not addressed, the code is likely to reappear. It's important to diagnose and fix the root cause of the issue.

9. Are there any recalls or technical service bulletins related to the OBDII code B127D in a 2018 Chevrolet Silverado?

- It's recommended to check with a Chevrolet dealership or online resources for any recalls or technical service bulletins specific to the Microphone 3 Input Signal Circuit issue in your vehicle.

10. Can a faulty Microphone 3 Input Signal Circuit impact other systems or components in a 2018 Chevrolet Silverado?

- While the primary impact of the issue may be on communication features, it's possible that a fault in the Microphone 3 Input Signal Circuit could potentially affect other systems connected to the vehicle's entertainment or communication network.