B127C 2017 GMC Sierra Code - Microphone 2 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
- B127C 2017 GMC Sierra indicates Microphone 2 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 B127C 2017 GMC Sierra Description
What are the Possible Causes of the DTC B127C 2017 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 B127C 2017 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 B127C 2017 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 B127C 2017 GMC Sierra Code
1. What does the OBDII code B127C mean on a 2017 GMC Sierra?
B127C indicates an issue with the Microphone 2 Input Signal Circuit, which may affect the vehicle’s audio or voice recognition systems.
2. What are the common symptoms of the B127C code in a 2017 GMC Sierra?
Symptoms may include malfunctioning voice commands, poor audio quality during hands-free calls, or errors in the infotainment system.
3. What causes the B127C code to appear in a 2017 GMC Sierra?
Common causes include a faulty microphone, damaged wiring or connectors in the Microphone 2 Input Circuit, or a failing infotainment control module.
4. How can I diagnose the B127C code on my GMC Sierra?
Start by checking the wiring and connectors for damage or loose connections, then test the microphone for proper functionality. Use a scan tool to verify the code and related data.
5. Can I drive my 2017 GMC Sierra with the B127C code?
Yes, the vehicle is typically safe to drive, but features like hands-free calling or voice recognition may not function properly.
6. How do I fix the B127C code on a 2017 GMC Sierra?
Repairs may involve replacing the faulty microphone, repairing damaged wiring or connectors, or reprogramming or replacing the infotainment control module.
7. How much does it cost to fix the B127C code on a GMC Sierra?
Repair costs vary but typically range from $100 to $300, depending on whether the microphone, wiring, or infotainment module needs to be repaired or replaced.
8. Can a software update fix the B127C code on a 2017 GMC Sierra?
In some cases, a software update for the infotainment system may resolve the issue if it’s related to a programming bug.
9. Where is Microphone 2 located in a 2017 GMC Sierra?
Microphone 2 is usually located in the headliner near the rearview mirror or overhead console, depending on the vehicle trim.
10. Do I need professional help to fix the B127C code?
While basic checks like inspecting wiring can be done at home, diagnosing and repairing the issue may require professional tools and expertise.
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