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B127D 2016 GMC Sierra Code - Microphone 3 Input Signal Circuit

Quick Answer

The B127D diagnostic trouble code (DTC) for the 2016 GMC Sierra relates to the Microphone 3 Input Signal Circuit. Common causes include Faulty microphone hardware, Wiring issues such as a short circuit or open circuit, Loose or corroded connections in the microphone circuit. 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
B127D 2016 GMC Sierra indicates Microphone 3 Input Signal Circuit.
Common causes
Common causes include Faulty microphone hardware, Wiring issues such as a short circuit or open circuit, Loose or corroded connections in the microphone circuit.
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 12, 2024
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Code B127D 2016 GMC Sierra Description

The B127D diagnostic trouble code (DTC) for the 2016 GMC Sierra relates to the Microphone 3 Input Signal Circuit. This code indicates that there is a malfunction in the circuit responsible for transmitting signals from the third microphone in the vehicle. The microphone is commonly used for functions such as hands-free calling, voice commands, and possibly for features like noise cancellation or interior monitoring.

OBDII Code B127D 2016 GMC Sierra - Microphone 3 Input Signal Circuit
B127D 2016 GMC Sierra Code - Microphone 3 Input Signal Circuit

Common Causes of B127D 2016 GMC Sierra

  1. Faulty microphone hardware.
  2. Wiring issues such as a short circuit or open circuit.
  3. Loose or corroded connections in the microphone circuit.
  4. Malfunctioning audio control module.
  5. Water or moisture damage affecting the microphone or its connections.

Symptoms of B127D 2016 GMC Sierra

  1. Inability to make hands-free phone calls or use voice commands.
  2. Poor audio quality during phone calls or voice-activated features.
  3. Voice recognition system not responding correctly or at all.
  4. Error messages related to the microphone or audio system.
  5. Loss of functionality in other audio-related features that rely on microphone input.

How to Fix B127D 2016 GMC Sierra

  1. Begin by diagnosing the specific cause of the issue using a diagnostic scan tool to confirm the Microphone 3 Input Signal Circuit fault.
  2. Inspect the microphone, wiring, and connections for any visible damage or signs of wear. Replace or repair any damaged components.
  3. Test the microphone's functionality by checking its resistance, continuity, and signal output.
  4. If the microphone itself is faulty, replace it with a new one compatible with the vehicle's system.
  5. Clear the DTC from the vehicle's memory using the diagnostic scan tool and test the repaired system to ensure proper functionality.

Cost to Fix B127D 2016 GMC Sierra

The cost estimate for repairing the Microphone 3 Input Signal Circuit issue in a 2016 GMC Sierra can vary depending on the specific cause of the problem. On average, the parts cost for a new microphone can range from $50 to $150. Labor costs at an auto repair shop may range from $100 to $200, depending on the shop's hourly rate and the time required for diagnosis and repair. Overall, the total repair cost for this issue could range from $150 to $350. It's essential to consider additional costs for diagnostics, taxes, and any other potential components that may need replacement during the repair process.

What does this mean?

Tech Notes for B127D 2016 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 B127D 2016 GMC Sierra Code

1. What does the OBDII code B127D mean on a 2016 GMC Sierra?

B127D indicates an issue with the Microphone 3 Input Signal Circuit, meaning the vehicle's system has detected a fault in the signal from the third microphone.

2. What are the symptoms of code B127D in a 2016 GMC Sierra?

Common symptoms include poor or non-functional microphone operation, such as voice commands not working or poor audio quality during hands-free calls.

3. What could cause the B127D code to appear on my GMC Sierra?

Possible causes include a faulty microphone, damaged wiring or connectors, issues with the audio control module, or electrical interference in the circuit.

4. Can I still drive my 2016 GMC Sierra with a B127D code?

Yes, the vehicle is still drivable, but hands-free communication or voice commands may not function properly.

5. How do I diagnose the B127D code on a 2016 GMC Sierra?

Start by inspecting the wiring and connectors for the third microphone for damage or loose connections. Then, test the microphone itself and verify the signal at the audio control module.

6. How can I fix the B127D code on my GMC Sierra?

Repair or replace any damaged wires or connectors, replace the faulty microphone if necessary, and ensure the audio control module is functioning correctly.

7. Where is Microphone 3 located in the 2016 GMC Sierra?

Microphone 3 is typically located in the interior roof area, often near the rearview mirror or headliner, depending on the trim level and configuration.

8. Can a software issue cause the B127D code on a 2016 GMC Sierra?

While rare, a software glitch in the audio control module could cause this code. Reflashing or updating the module's software may resolve the issue.

9. How much does it cost to fix the B127D code on a GMC Sierra?

Repair costs vary but typically range from $50 to $200, depending on whether the issue is with the microphone, wiring, or audio control module.

10. Can I reset the B127D code without fixing the problem?

You can clear the code using an OBDII scanner, but it will likely return if the underlying issue is not resolved.

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