AutoCodes – GMC – B127D 2017 GMC Sierra

B127D 2017 GMC Sierra 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 2017 GMC Sierra 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 233

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code B127D 2017 GMC Sierra 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 2017 GMC Sierra - Microphone 3 Input Signal Circuit - AutoCodes.com — B127D 2017 GMC Sierra Code - Microphone 3 Input Signal Circuit

What does this mean?

What are the Possible Causes of the DTC B127D 2017 GMC Sierra?

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 2017 GMC Sierra?

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 2017 GMC Sierra 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 2017 GMC Sierra code?

Need more information on how to fix the B127D 2017 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B127D 2017 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 2017 GMC Sierra Code

1. What are common symptoms of OBDII code B127D on a 2017 GMC Sierra?

- Common symptoms include issues with the microphone, such as no sound, poor audio quality, or complete failure of the microphone system.

2. What does the OBDII code B127D indicate in a 2017 GMC Sierra?

- OBDII code B127D in a 2017 GMC Sierra specifically refers to a fault in the Microphone 3 Input Signal Circuit.

3. What are the possible causes of OBDII code B127D on a 2017 GMC Sierra?

- Possible causes include a faulty microphone, damaged wiring or connections related to the microphone, or a malfunction in the audio system control module.

4. How can I diagnose the Microphone 3 Input Signal Circuit issue in my 2017 GMC Sierra?

- Diagnosis involves checking the microphone connections, inspecting the wiring for any damage, and using a diagnostic tool to scan for the specific fault code B127D.

5. Can I repair the Microphone 3 Input Signal Circuit issue in my 2017 GMC Sierra myself?

- Depending on your level of automotive repair experience, you may be able to address the issue by replacing a faulty microphone, repairing damaged wiring, or resetting the audio system control module.

6. Is it safe to continue driving my 2017 GMC Sierra with OBDII code B127D?

- While the vehicle may still be operable with this code, it is recommended to address the issue promptly to ensure the proper functioning of the microphone system.

7. How much does it typically cost to repair the Microphone 3 Input Signal Circuit issue in a 2017 GMC Sierra?

- Repair costs can vary depending on the exact cause of the issue, but expenses may include parts such as a new microphone, labor for installation, and diagnostic fees.

8. Can a dealership or auto repair shop help with fixing OBDII code B127D on a 2017 GMC Sierra?

- Yes, experienced technicians at a dealership or auto repair shop can diagnose and repair the Microphone 3 Input Signal Circuit problem in your 2017 GMC Sierra.

9. Will resetting the OBDII code B127D clear the issue in my 2017 GMC Sierra?

- Resetting the code may temporarily clear the warning light, but it is crucial to address the underlying problem with the Microphone 3 Input Signal Circuit to prevent future issues.

10. Is the Microphone 3 Input Signal Circuit issue covered under any warranty for a 2017 GMC Sierra?

- Depending on your vehicle's warranty coverage, the repair for the Microphone 3 Input Signal Circuit issue may be covered under certain warranties, such as the manufacturer's warranty or an extended warranty plan.