B127D 2018 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 2018 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 2018 GMC Sierra Description
What are the Possible Causes of the DTC B127D 2018 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 2018 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 2018 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 2018 GMC Sierra Code
1. What does the OBDII code B127D mean on a 2018 GMC Sierra?
It indicates an issue with the Microphone 3 input signal circuit, often related to communication problems with the microphone used for voice commands or Bluetooth.
2. What are the symptoms of the B127D code in a 2018 GMC Sierra?
Common symptoms include poor or no audio reception during voice commands, Bluetooth calls, or distorted sound from the microphone.
3. What causes the B127D code to appear?
Possible causes include a faulty microphone, damaged wiring, a loose or corroded connector, or a malfunction in the infotainment system.
4. How can I diagnose the B127D code on my 2018 GMC Sierra?
Check the microphone's wiring and connector for damage or corrosion, ensure proper connection, and use a diagnostic tool to verify signal integrity.
5. Can a faulty microphone trigger the B127D code?
Yes, a defective or disconnected microphone can cause the code to appear.
6. Is the B127D code related to the infotainment system?
Yes, the code may indicate a communication issue between the microphone and the infotainment system.
7. How do I fix the B127D code on a 2018 GMC Sierra?
Repair or replace any damaged wiring or connectors, and replace the microphone if it's faulty. If the issue persists, the infotainment system may require reprogramming or repair.
8. Can I drive with the B127D code active?
Yes, this code typically does not affect the drivability of the vehicle, but it can impair voice command and Bluetooth functionality.
9. How much does it cost to fix the B127D code on a 2018 GMC Sierra?
Repairs can range from $50 to $300, depending on whether the issue is with wiring, the microphone, or the infotainment system.
10. Can a software update resolve the B127D code?
In some cases, a software update for the infotainment system may fix compatibility or signal issues causing the code.
Discuss the causes and fixes for B127D 2018 GMC Sierra OBDII Code
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