AutoCodes – Buick – B127C Buick

B127C Buick 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 Buick 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 791

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 Buick 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 Buick - Microphone 2 Input Signal Circuit - AutoCodes.com — B127C Buick Code - Microphone 2 Input Signal Circuit

What does this mean?

What are the Possible Causes of the DTC B127C Buick?

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 Buick?

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 Buick 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.

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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 Buick Code

1. What are the common symptoms of OBDII code B127C in a Buick related to the Microphone 2 Input Signal Circuit?

- Common symptoms include issues with hands-free calling, voice command functions, and overall audio quality from the microphone.

2. What are the possible causes of OBDII code B127C in a Buick related to the Microphone 2 Input Signal Circuit?

- Causes can include a faulty microphone, damaged wiring or connectors, software glitches, or issues with the vehicle's audio system.

3. How can I diagnose the Microphone 2 Input Signal Circuit issue triggering OBDII code B127C in my Buick?

- Start by checking the microphone for physical damage, then inspect the wiring and connectors for any visible issues. It may also be necessary to test the microphone's functionality using diagnostic tools.

4. Can I repair the Microphone 2 Input Signal Circuit problem causing OBDII code B127C in my Buick myself?

- Depending on the root cause, you may be able to repair the issue yourself by replacing the microphone, repairing damaged wiring, or addressing software-related issues. However, professional assistance may be needed for complex repairs.

5. Are there any temporary fixes or workarounds for OBDII code B127C related to the Microphone 2 Input Signal Circuit in a Buick?

- In some cases, resetting the vehicle's audio system or disconnecting and reconnecting the microphone may temporarily resolve the issue. However, these are not permanent solutions and professional repair is recommended.

6. How important is it to address OBDII code B127C related to the Microphone 2 Input Signal Circuit in my Buick?

- While the issue may not affect the vehicle's drivability, it is important to address it to ensure proper functioning of hands-free communication features and overall audio quality.

7. Can a malfunctioning Microphone 2 Input Signal Circuit impact other vehicle systems in my Buick?

- While the primary impact is on hands-free communication and audio systems, a malfunctioning microphone circuit could potentially affect other vehicle systems that rely on audio input signals.

8. Is it safe to continue driving my Buick with OBDII code B127C related to the Microphone 2 Input Signal Circuit?

- As long as the issue does not pose a safety risk or affect the vehicle's drivability, it is generally safe to continue driving. However, prompt repair is recommended to avoid potential inconvenience.

9. Will resetting the OBDII code B127C related to the Microphone 2 Input Signal Circuit in my Buick make it go away permanently?

- Resetting the code may temporarily clear the warning light, but it will likely reappear if the underlying issue with the Microphone 2 Input Signal Circuit is not addressed.

10. How much does it typically cost to repair OBDII code B127C related to the Microphone 2 Input Signal Circuit in a Buick?

- The cost of repair can vary depending on the specific cause of the issue, parts needed, and labor costs. It is advisable to consult a mechanic or dealership for an accurate estimate.