AutoCodes – GMC – B124B 2015 GMC Sierra

B124B 2015 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 2015 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.

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Code Popularity 241

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
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Code B124B 2015 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 2015 GMC Sierra - USB 1 Circuit - AutoCodes.com — B124B 2015 GMC Sierra Code - USB 1 Circuit

What does this mean?

What are the Possible Causes of the DTC B124B 2015 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 2015 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 2015 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 2015 GMC Sierra code?

Need more information on how to fix the B124B 2015 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B124B 2015 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 2015 GMC Sierra Code

1. What does the OBDII code B124B mean on a 2015 GMC Sierra?

The B124B code indicates an issue with the USB 1 Circuit, typically related to the USB port or its wiring.

2. What are the common symptoms of the B124B code in a 2015 GMC Sierra?

Symptoms include USB ports not functioning, inability to recognize connected devices, or intermittent USB connectivity.

3. What causes the B124B code in a GMC Sierra?

Common causes are damaged USB ports, faulty wiring, a blown fuse, or a malfunctioning infotainment system module.

4. Can a faulty USB cable cause the B124B code?

No, a faulty USB cable wonâ€™t trigger the code, but it might cause connectivity issues. The code is related to the vehicleâ€™s USB circuit itself.

5. How do I diagnose the B124B code on a 2015 GMC Sierra?

Start by inspecting the USB port, checking for physical damage, testing the wiring for continuity, and verifying the fuse related to the USB circuit.

6. Is the B124B code serious enough to affect the vehicleâ€™s overall performance?

No, the code primarily affects the USB functionality and does not impact the vehicleâ€™s drivability or core systems.

7. Can I fix the B124B code myself?

If the issue is a blown fuse or loose wiring, you can fix it yourself. For complex issues like a faulty infotainment module, professional assistance may be needed.

8. How much does it cost to repair the B124B code on a 2015 GMC Sierra?

Repairs can range from $50 to $300, depending on whether the issue is a simple wiring fix or a replacement of the USB port or module.

9. Does the B124B code require reprogramming the infotainment system?

Reprogramming is not typically required unless the infotainment module itself is replaced or updated.

10. What should I do if the B124B code reappears after being cleared?

If the code reappears, recheck the USB wiring, connections, and port for underlying issues, or consult a professional mechanic for a deeper diagnosis.