AutoCodes – Chevrolet – B1277 2018 Chevrolet Silverado

B1277 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado 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.

Save to My Repairs My Repairs

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

Code Popularity 219

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 B1277 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado - Microphone 1 Input Signal Circuit - AutoCodes.com — B1277 2018 Chevrolet Silverado Code - Microphone 1 Input Signal Circuit

What does this mean?

What are the Possible Causes of the DTC B1277 2018 Chevrolet Silverado?

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 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 B1277 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 B1277 2018 Chevrolet Silverado code?

Need more information on how to fix the B1277 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1277 2018 Chevrolet Silverado 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 B1277 2018 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code B1277 in a 2018 Chevrolet Silverado related to the Microphone 1 Input Signal Circuit?

- Common symptoms include issues with the vehicle's hands-free calling system, such as the microphone not working properly or no sound being transmitted during calls.

2. What are some possible causes of the B1277 code in a 2018 Chevrolet Silverado?

- Potential causes of the B1277 code can include a faulty microphone, damaged wiring or connectors in the microphone circuit, or issues with the audio control module.

3. How can I diagnose the B1277 code in my 2018 Chevrolet Silverado?

- Diagnosing the B1277 code typically involves inspecting the microphone and its connections for any visible damage, testing the microphone for functionality, and checking the wiring harness for continuity and proper connections.

4. Can I repair the B1277 code in my 2018 Chevrolet Silverado myself?

- While some basic troubleshooting steps can be attempted by DIY enthusiasts, diagnosing and repairing the B1277 code related to the Microphone 1 Input Signal Circuit may require specialized tools and expertise, so it is recommended to consult a professional mechanic.

5. Is it safe to continue driving my 2018 Chevrolet Silverado with the B1277 code present?

- It is generally safe to drive the vehicle with the B1277 code, as it is related to the hands-free calling system. However, it is advisable to address the issue promptly to ensure proper functionality of the communication system.

6. How much does it typically cost to repair the B1277 code in a 2018 Chevrolet Silverado?

- The cost of repairing the B1277 code can vary depending on the underlying cause of the issue. It is recommended to obtain a diagnostic from a qualified mechanic to get an accurate estimate.

7. Will resetting the OBDII system clear the B1277 code in my 2018 Chevrolet Silverado?

- Resetting the OBDII system may temporarily clear the B1277 code, but if the underlying issue with the Microphone 1 Input Signal Circuit is not addressed, the code is likely to reappear.

8. How important is it to fix the B1277 code in my 2018 Chevrolet Silverado?

- Fixing the B1277 code is important for maintaining the proper functioning of the hands-free calling system in your Chevrolet Silverado, ensuring driver safety and convenience.

9. Can extreme weather conditions affect the occurrence of the B1277 code in a 2018 Chevrolet Silverado?

- Extreme weather conditions, such as extreme heat or cold, can potentially affect the functioning of electronic components like the microphone, leading to the triggering of the B1277 code.

10. Are there any recalls or technical service bulletins related to the B1277 code in a 2018 Chevrolet Silverado?

- It is advisable to check with a Chevrolet dealership or the manufacturer's website for any recalls or technical service bulletins related to the B1277 code in your specific vehicle model.