AutoCodes – GMC – B124C 2017 GMC Sierra

B124C 2017 GMC Sierra Code - USB 2 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: B124C 2017 GMC Sierra indicates USB 2 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 182

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 B124C 2017 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 B124C 2017 GMC Sierra - USB 2 Circuit - AutoCodes.com — B124C 2017 GMC Sierra Code - USB 2 Circuit

What does this mean?

What are the Possible Causes of the DTC B124C 2017 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 B124C 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 B124C 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 B124C 2017 GMC Sierra code?

Need more information on how to fix the B124C 2017 GMC Sierra code? Get Access to Factory Service Manuals

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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 B124C 2017 GMC Sierra Code

1. What does the OBDII code B124C mean on a 2017 GMC Sierra?

The code B124C refers to an issue with the USB 2 circuit, indicating a fault in the secondary USB port or its associated wiring.

2. What are common symptoms of the B124C code in a 2017 GMC Sierra?

Symptoms may include a non-functional USB port, inability to charge devices, or failure to connect to infotainment systems through the secondary USB port.

3. What causes the B124C code on a 2017 GMC Sierra?

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

4. Can a loose cable cause the B124C code?

Yes, a loose or disconnected USB cable can trigger the B124C code by disrupting the circuit.

5. How do I troubleshoot the B124C code on my 2017 GMC Sierra?

Start by inspecting the USB port and its wiring for visible damage, check the associated fuses, and verify the connections to the infotainment system.

6. Is the B124C code serious on a 2017 GMC Sierra?

While it doesnâ€™t affect vehicle performance, it can limit functionality of the USB port and connected devices, which may be inconvenient.

7. Can I still use other USB ports if the B124C code is active?

Yes, other USB ports not tied to the USB 2 circuit should still function normally unless they share the same fault.

8. What repairs are typically needed to fix the B124C code?

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

9. How much does it cost to fix the B124C code on a 2017 GMC Sierra?

The cost depends on the specific issue but typically ranges from $50 to $200 for inspection, wiring repairs, or USB port replacement.

10. Can I fix the B124C code myself on my 2017 GMC Sierra?

If youâ€™re comfortable with basic electrical work, you can inspect and replace the USB port or wiring, but more complex issues may require professional help.