B127A 2016 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 2016 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 2016 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 2016 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 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.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B127A 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 B127A 2016 GMC Sierra Code
1. What does the OBDII code B127A mean on a 2016 GMC Sierra?
B127A indicates an issue with the Auxiliary Video Input Signal Circuit, often suggesting a problem with the input signal or related wiring for the vehicle's video system.
2. What are the symptoms of code B127A in a 2016 GMC Sierra?
Common symptoms include the auxiliary video input not working, no video display on the screen, or intermittent video signal issues.
3. What causes the B127A code to trigger?
This code can be caused by damaged or loose wiring, a faulty auxiliary video input port, a malfunctioning control module, or issues with the display screen.
4. How can I diagnose the B127A code on my GMC Sierra?
Check the wiring and connectors for damage or corrosion, inspect the auxiliary video input port, and use a scan tool to monitor the video signal circuit for irregularities.
5. Can I still use my vehicle normally with a B127A code?
Yes, this code typically affects only the auxiliary video input system and does not impact the drivability of the vehicle.
6. How do I fix the B127A code on my 2016 GMC Sierra?
Repairs may include repairing or replacing damaged wiring, cleaning corroded connectors, replacing the auxiliary video input port, or reprogramming the control module if necessary.
7. Do I need special tools to fix the B127A code?
A scan tool capable of reading and diagnosing body control module codes, as well as basic tools for wiring inspection and repair, are typically needed.
8. Is the B127A code covered under warranty for a 2016 GMC Sierra?
It depends on your warranty coverage. Auxiliary systems may have limited warranty terms, so check with your dealership or warranty provider.
9. Can I clear the B127A code without repairing the issue?
Clearing the code with a scan tool may temporarily remove it, but the code will likely return unless the underlying issue is resolved.
10. How much does it cost to repair a B127A code on a GMC Sierra?
Repair costs vary depending on the specific issue but may range from $50 for minor wiring repairs to over $500 if a module or display system replacement is required.
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