AutoCodes – GMC – B124B 2016 GMC Sierra

B124B 2016 GMC Sierra Code - USB 1 Circuit

Quick Answer

The infotainment system has a USB port and an Auxiliary Audio Input Jack located in the center console. Common causes include Faulty USB Port, USB Port harness is open or shorted, USB Port 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: B124B 2016 GMC Sierra indicates USB 1 Circuit.
Common causes: Common causes include Faulty USB Port, USB Port harness is open or shorted, USB Port 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 234

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 19, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code B124B 2016 GMC Sierra Description

The infotainment system has a USB port and an Auxiliary Audio Input Jack located in the center console. The receptacle assembly receives fused battery voltage and ground from the harness to power the internal hub device as well as providing additional amperage to power USB devices.
The internal hub device interfaces directly with the human-machine interface control module via a standard USB cable. A Mini type of USB connector is used to connect the human-machine interface control module and the USB receptacle. Standard USB male-to-female connections are typically 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 infotainment system from portable media players or a USB storage device (memory stick/ flash drive). When a device is connected to the USB port, the system detects the device and switches to USB as the audio source. Once connected, the device can be controlled by the radio controls.
Not all portable media player devices or file types are compatible. Refer to the owner’s manual for information on USB devices, control, and operation.

OBDII Code B124B 2016 GMC Sierra - USB 1 Circuit - AutoCodes.com — B124B 2016 GMC Sierra Code - USB 1 Circuit

What does this mean?

What are the Possible Causes of the DTC B124B 2016 GMC Sierra?

Faulty USB Port
USB Port harness is open or shorted
USB Port circuit poor electrical connection
Faulty Human Machine Interface Control Module (If equipped)
Faulty Radio

How to Fix the DTC B124B 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 B124B 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.

Need more information about the B124B 2016 GMC Sierra code?

Need more information on how to fix the B124B 2016 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B124B 2016 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 B124B 2016 GMC Sierra Code

1. What does the OBDII code B124B mean on a 2016 GMC Sierra?

The B124B code indicates an issue with the USB 1 circuit, typically involving a malfunction in the USB port or its associated wiring.

2. What are the symptoms of the B124B code in a 2016 GMC Sierra?

Common symptoms include the USB port not recognizing devices, slow charging, or devices disconnecting intermittently.

3. What causes the B124B code to appear?

Causes may include a damaged USB port, faulty wiring, a blown fuse, or a defective infotainment system module.

4. How do I diagnose the B124B code on my GMC Sierra?

Inspect the USB port for physical damage, check the wiring for continuity, and verify the fuse for the USB circuit is intact.

5. Can I still use my truck with the B124B code active?

Yes, the truck will still operate, but the USB port functionality may be impaired or non-functional.

6. How do I fix the B124B code on my 2016 GMC Sierra?

Repairs may include replacing the USB port, repairing damaged wiring, or reprogramming or replacing the infotainment system module.

7. Is the B124B code covered under warranty?

It depends on your vehicleâ€™s warranty terms and mileage, but it may be covered if the warranty is still active.

8. Can a loose connection cause the B124B code?

Yes, a loose or corroded USB cable connection can trigger the B124B code.

9. What tools are needed to troubleshoot the B124B code?

Youâ€™ll need a multimeter to test wiring continuity, a scan tool to clear codes, and basic tools to access the USB port and wiring.

10. Do I need to visit a dealership to fix the B124B code?

Not necessarily; a qualified mechanic or someone with electrical troubleshooting experience can often repair the issue. However, dealership service may be required for module reprogramming.