AutoCodes – GMC – B127A 2017 GMC Sierra

B127A 2017 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 2017 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.

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Code Popularity 244

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 29, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B127A 2017 GMC Sierra Description

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. Refer to the Owner's Manual for information on compatible devices and supported media types/formats.
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.

OBDII Code B127A 2017 GMC Sierra - Auxiliary Video Input Signal Circuit - AutoCodes.com — B127A 2017 GMC Sierra Code - Auxiliary Video Input Signal Circuit

What does this mean?

What are the Possible Causes of the DTC B127A 2017 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 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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B127A 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.

Need more information about the B127A 2017 GMC Sierra code?

Need more information on how to fix the B127A 2017 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B127A 2017 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B127A 2017 GMC Sierra Code

1. What are the common symptoms of OBDII code B127A in a 2017 GMC Sierra related to the Auxiliary Video Input Signal Circuit?

The common symptoms include a blank or distorted display on the video screen, loss of audio or video output, and intermittent connectivity issues with auxiliary devices.

2. What are the possible causes of the B127A OBDII code in a 2017 GMC Sierra?

Possible causes include a faulty auxiliary video input signal module, damaged wiring harness or connectors, loose connections, or a malfunctioning audio/video control module.

3. How can I diagnose the issue related to the Auxiliary Video Input Signal Circuit in my 2017 GMC Sierra?

You can start by checking the wiring harness and connectors for any visible damage or corrosion. It is also recommended to perform a thorough inspection of the auxiliary video input module and the audio/video control module for any signs of malfunction.

4. Can I repair the B127A OBDII code issue in my 2017 GMC Sierra myself?

Depending on your level of automotive expertise, you may be able to address the issue by checking and repairing the wiring connections, replacing damaged components, or resetting the audio/video system. However, complex diagnostics and repairs may require professional assistance.

5. Are there any tips for preventing the recurrence of the B127A code in my 2017 GMC Sierra?

To prevent the recurrence of the B127A code, you should ensure proper maintenance of the audio/video system components, avoid using incompatible auxiliary devices, and periodically check the wiring connections for any wear or damage.

6. How important is it to address the B127A OBDII code in a 2017 GMC Sierra promptly?

It is essential to address the B127A OBDII code promptly to prevent further damage to the audio/video system components and ensure the proper functioning of the auxiliary video input signal circuit in your 2017 GMC Sierra.

7. Can the B127A OBDII code affect the overall performance of my 2017 GMC Sierra?

While the B127A OBDII code is specific to the auxiliary video input signal circuit, unresolved issues related to this code can impact the multimedia experience and convenience features in your 2017 GMC Sierra.

8. Is it safe to continue driving my 2017 GMC Sierra with the B127A OBDII code present?

It is generally safe to drive your 2017 GMC Sierra with the B127A OBDII code, but it is recommended to address the underlying issue promptly to restore the functionality of the auxiliary video input signal circuit.

9. How much can I expect to pay for repairing the B127A OBDII code in my 2017 GMC Sierra?

The cost of repairing the B127A OBDII code can vary depending on the extent of the issue, the need for replacement parts, and labor costs. It is advisable to consult a professional mechanic for an accurate estimate.

10. Will resetting the OBDII system clear the B127A code in my 2017 GMC Sierra?

Resetting the OBDII system may temporarily clear the B127A code, but if the underlying issue is not addressed, the code is likely to reappear. It is crucial to diagnose and resolve the root cause of the problem for a lasting solution.