B127A 2018 GMC Sierra Code - Auxiliary Video Input Signal Circuit
Quick Answer
The rear seat entertainment system has an auxiliary input assembly that contains a USB port, an SD card reader, RCA-type audio/video jacks, and a wired headphone jack with volume control. Common causes include Faulty Audio/Video Input Adapter, Audio/Video Input Adapter harness is open or shorted, Audio/Video Input Adapter 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
- B127A 2018 GMC Sierra indicates Auxiliary Video Input Signal Circuit.
- Common causes
- Common causes include Faulty Audio/Video Input Adapter, Audio/Video Input Adapter harness is open or shorted, Audio/Video Input Adapter 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 B127A 2018 GMC Sierra Description
The USB port and SD card reader slot interface with a hub device, internal to the assembly. The assembly receives fused battery voltage and ground from the harness to power the internal hub device as well as provide additional amperage to power USB devices.
The internal hub device interfaces directly with the disc player via a standard USB cable. A Mini-type USB connector is used to connect the cable to the disc player and the auxiliary input assembly. Mini-type USB male-to-female connections are used for connecting USB cables together where an in-line connection is required. An in-line cable connection is typically found between the console and the I/P harness.
The USB port allows connectivity to the rear seat entertainment system from portable media players or a USB storage device (memory stick/ flash drive). The rear seat entertainment uses the SD card reader as a mass storage device, like a USB storage device.
Once a supported device is connected to the USB port or SD card reader, the device may be sourced to one or both of the rear displays using the remote control.
What are the Possible Causes of the DTC B127A 2018 GMC Sierra?
- Faulty Audio/Video Input Adapter
- Audio/Video Input Adapter harness is open or shorted
- Audio/Video Input Adapter circuit poor electrical connection
- Faulty Media Disc Player
How to Fix the DTC B127A 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.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B127A 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 B127A 2018 GMC Sierra Code
1. What does OBDII code B127A mean on a 2018 GMC Sierra?
Code B127A refers to an issue with the Auxiliary Video Input Signal Circuit, indicating a fault in the video signal or related wiring for the auxiliary video input system.
2. What are the symptoms of code B127A in a 2018 GMC Sierra?
Common symptoms include the auxiliary video input not functioning, no video feedback on the infotainment screen, or the screen displaying an error message.
3. What causes code B127A to appear on a 2018 GMC Sierra?
Causes may include damaged or loose wiring, a faulty auxiliary video input connector, a defective infotainment system, or a software issue in the control module.
4. How do I diagnose code B127A in my 2018 GMC Sierra?
Start by inspecting the auxiliary video input wiring and connectors for damage or disconnection. Use a scan tool to check for related codes and monitor the input signal for abnormalities.
5. Can a blown fuse trigger code B127A in a 2018 GMC Sierra?
It's possible. Check the fuses related to the infotainment system and auxiliary inputs to ensure none are blown.
6. Is it safe to drive with code B127A on my 2018 GMC Sierra?
Yes, this code does not affect vehicle drivability but may limit the functionality of your auxiliary video input system.
7. How do I fix code B127A in a 2018 GMC Sierra?
Repair or replace damaged wiring, secure any loose connections, update the infotainment system software if necessary, or replace faulty components such as the auxiliary input port.
8. Can software updates resolve code B127A on a 2018 GMC Sierra?
Yes, if the issue is due to a software glitch in the infotainment system, updating the system software may resolve the problem.
9. How much does it cost to fix code B127A in a 2018 GMC Sierra?
Costs vary depending on the issue. Simple fixes like repairing wiring or replacing connectors may cost $50-$150, while infotainment system repairs can range from $300-$1,000.
10. Do I need a professional to fix code B127A on my 2018 GMC Sierra?
If you are comfortable with basic electrical troubleshooting, you can attempt to fix it yourself. However, for complex diagnostics or component replacement, professional assistance is recommended.
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