B127D 2016 GMC Sierra Code - Microphone 3 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
- B127D 2016 GMC Sierra indicates Microphone 3 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.
Code B127D 2016 GMC Sierra Description
What are the Possible Causes of the DTC B127D 2016 GMC Sierra?
- 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 B127D 2016 GMC Sierra?
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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B127D 2016 GMC Sierra 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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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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