AutoCodes – Buick – B1277 Buick

B1277 Buick Code - Microphone 1 Input Signal Circuit

Quick Answer

For Cellular, Entertainment, and Navigation Systems: The Human Machine Interface Control Module uses the cellular telephone microphone for voice recognition and cellular features. Common causes include Faulty Cellular Phone Microphone (For Cellular, Entertainment, and Navigation Systems), Faulty Radio Volume Compensator Interior Noise Microphone (For Active Noise Cancellation System), Faulty Audio Amplifier (For Active Noise Cancellation System). 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: B1277 Buick indicates Microphone 1 Input Signal Circuit.
Common causes: Common causes include Faulty Cellular Phone Microphone (For Cellular, Entertainment, and Navigation Systems), Faulty Radio Volume Compensator Interior Noise Microphone (For Active Noise Cancellation System), Faulty Audio Amplifier (For Active Noise Cancellation System).
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 910

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 B1277 Buick Description

For Cellular, Entertainment, and Navigation Systems:
The Human Machine Interface Control Module uses the cellular telephone microphone for voice recognition and cellular features. The Human Machine Interface Control Module provides a bias voltage to each microphone (+) and (-) signal circuit for the operation of the microphone.
The radio provides the cellular phone microphone with a supplied voltage on the cellular phone microphone high signal circuit. When the microphone is in use, voice data from the user is sent back to the radio on the cellular microphone low signal circuit.

For Active Noise Cancellation System:
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.

OBDII Code B1277 Buick - Microphone 1 Input Signal Circuit - AutoCodes.com — B1277 Buick Code - Microphone 1 Input Signal Circuit

What does this mean?

What are the Possible Causes of the DTC B1277 Buick?

Faulty Cellular Phone Microphone (For Cellular, Entertainment, and Navigation Systems)
Faulty Radio Volume Compensator Interior Noise Microphone (For Active Noise Cancellation System)
Faulty Audio Amplifier (For Active Noise Cancellation System)
Faulty Human Machine Interface Control Module or Radio (For Cellular, Entertainment, and Navigation Systems)

How to Fix the DTC B1277 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 B1277 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 B1277 Buick Code

1. What are common symptoms of OBDII code B1277 in a Buick related to the Microphone 1 Input Signal Circuit?

- Common symptoms include a malfunctioning microphone, loss of voice command functionality, and issues with the hands-free calling system.

2. What are possible causes of the B1277 OBDII code in a Buick?

- Possible causes include a defective microphone, damaged wiring or connectors in the microphone circuit, or a faulty audio control module.

3. How can I diagnose the Microphone 1 Input Signal Circuit issue in my Buick?

- Diagnose the issue by checking the microphone for physical damage, inspecting wiring for breaks or shorts, and using a multimeter to test for continuity and proper voltage.

4. Can I repair the B1277 code related to Microphone 1 Input Signal Circuit myself?

- Depending on your expertise, you may be able to repair the issue yourself by replacing the faulty microphone, repairing damaged wiring, or resetting the audio control module.

5. Is it safe to continue driving with the B1277 code in my Buick?

- While the code may not affect the vehicle's drivability, it's recommended to address the issue promptly to restore the functionality of the microphone and hands-free system.

6. How much does it typically cost to fix the Microphone 1 Input Signal Circuit problem in a Buick?

- The cost of repair can vary based on the specific issue, but it may range from $100 to $300 for parts and labor, depending on whether you perform the repair yourself or take it to a mechanic.

7. Are there any temporary fixes for the B1277 code in my Buick?

- Temporary fixes may include disconnecting and reconnecting the microphone to ensure a proper connection or resetting the audio system to see if the code clears.

8. Can extreme temperatures or humidity affect the Microphone 1 Input Signal Circuit in a Buick?

- Yes, extreme temperatures and humidity can potentially cause damage to the microphone or affect the electrical connections, leading to issues with the signal circuit.

9. How long does it typically take to repair the B1277 code related to the Microphone 1 Input Signal Circuit?

- The repair time can vary based on the exact cause of the issue, but it may take anywhere from 30 minutes to a few hours to diagnose and fix the problem.

10. Will resetting the vehicle's computer clear the B1277 OBDII code in my Buick?

- Resetting the vehicle's computer may temporarily clear the code, but it's important to address the underlying issue causing the code to prevent it from reoccurring.