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Engine-Codes – GMC – B127C 2014 GMC Sierra

B127C 2014 GMC Sierra Code - Microphone 2 Input Signal Circuit

Quick Answer

The B127C diagnostic trouble code (DTC) for a 2014 GMC Sierra refers to an issue with the Microphone 2 Input Signal Circuit. Common causes include Wiring harness damage or short circuit, Corrosion or loose connection in the microphone circuit, Faulty microphone component. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
B127C 2014 GMC Sierra indicates Microphone 2 Input Signal Circuit.
Common causes
Common causes include Wiring harness damage or short circuit, Corrosion or loose connection in the microphone circuit, Faulty microphone component.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 16, 2024
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Code B127C 2014 GMC Sierra Description

The B127C diagnostic trouble code (DTC) for a 2014 GMC Sierra refers to an issue with the Microphone 2 Input Signal Circuit. In modern vehicles, microphones are used for various functions such as hands-free calling, voice commands, and in-vehicle communication systems. The Microphone 2 Input Signal Circuit is responsible for transmitting the audio signal from the microphone to the vehicle's audio system or communication module.

OBDII Code B127C 2014 GMC Sierra - Microphone 2 Input Signal Circuit
B127C 2014 GMC Sierra Code - Microphone 2 Input Signal Circuit

Common Causes of B127C 2014 GMC Sierra

  1. Wiring harness damage or short circuit.
  2. Corrosion or loose connection in the microphone circuit.
  3. Faulty microphone component.
  4. Malfunctioning audio system or communication module.
  5. Water damage to the microphone or its components.

Symptoms of B127C 2014 GMC Sierra

  1. Poor call quality during hands-free phone calls.
  2. Inability to use voice commands effectively.
  3. No sound input from the microphone.
  4. Audio system not responding to voice prompts.
  5. Error message on the audio display related to microphone input.

How to Fix B127C 2014 GMC Sierra

  1. Begin by inspecting the wiring harness and connectors for any visible damage or corrosion. Repair or replace any damaged components.
  2. Test the microphone for functionality by checking its connection and signal output. Replace the microphone if necessary.
  3. Check the audio system and communication module for any malfunctions or error codes. Reset or reprogram these components as needed.
  4. Clear the DTC from the vehicle's onboard computer using a diagnostic scanner to reset the system and verify that the issue has been resolved.
  5. Conduct a thorough test drive to ensure that the microphone input signal is functioning correctly and that all symptoms associated with the B127C code have been resolved.

Cost to Fix B127C 2014 GMC Sierra

The typical repair costs for addressing the B127C code on a 2014 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of parts such as a new microphone or wiring harness components can range from $50 to $200. Labor costs at auto repair shops typically range from $80 to $150 per hour, with the total repair time estimated at 1-2 hours for this type of issue. Therefore, the total repair cost for addressing the Microphone 2 Input Signal Circuit problem could range from $130 to $400, including parts and labor. It's important to note that actual costs may vary based on the location of the repair shop, the vehicle's make and model, and any additional diagnostic or repair services required. It's advisable to consult with a professional mechanic for a more accurate cost estimate based on the specific circumstances of the vehicle.

What does this mean?

Tech Notes for B127C 2014 GMC Sierra

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.

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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 2014 GMC Sierra Code

1. What does the OBDII code B127C mean on a 2014 GMC Sierra?

B127C indicates an issue with the Microphone 2 Input Signal Circuit, which is related to the vehicle's hands-free or voice recognition system.

2. What are common symptoms of the B127C code?

Symptoms include poor or no voice recognition, malfunctioning hands-free phone operation, and potential error messages on the infotainment system.

3. What causes the B127C code to appear?

The code can be caused by a faulty microphone, damaged wiring or connectors in the microphone circuit, or an issue with the infotainment control module.

4. How can I diagnose the B127C code?

Start by inspecting the microphone and its wiring for visible damage or loose connections. Use a scan tool to verify the fault and test the circuit for continuity or short circuits.

5. Can I still use my hands-free system with a B127C code present?

In most cases, the hands-free system may not function properly, or voice commands may not be recognized.

6. How do I fix the B127C code on a 2014 GMC Sierra?

Repairs may involve replacing a faulty microphone, repairing damaged wiring, or reprogramming or replacing the infotainment control module if necessary.

7. Where is Microphone 2 located in the 2014 GMC Sierra?

Microphone 2 is typically located in the headliner or near the rearview mirror, depending on the trim and configuration of the vehicle.

8. Is the B127C code a serious issue?

While it won’t affect the drivability of the vehicle, it can hinder hands-free communication and voice recognition functions, which may be inconvenient.

9. Can a software update fix the B127C code?

In some cases, a software update to the infotainment system may resolve the issue if it is related to programming errors.

10. How much does it cost to repair the B127C code?

Repair costs vary depending on the root cause. Replacing a microphone may cost $50–$150, while module repairs or wiring fixes can be more expensive.

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