AutoCodes – GMC – B124C 2016 GMC Sierra

B124C 2016 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 2016 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 185

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 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 B124C 2016 GMC Sierra - USB 2 Circuit - AutoCodes.com — B124C 2016 GMC Sierra Code - USB 2 Circuit

What does this mean?

What are the Possible Causes of the DTC B124C 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 B124C 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 B124C 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 B124C 2016 GMC Sierra code?

Need more information on how to fix the B124C 2016 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 2016 GMC Sierra Code

1. What does the OBDII code B124C mean on a 2016 GMC Sierra?

The code B124C indicates an issue with the USB 2 circuit, which typically involves a malfunction in the wiring, connection, or component related to the second USB port.

2. What are the common symptoms of code B124C in a 2016 GMC Sierra?

Common symptoms include the second USB port not working, failure to charge devices, or inability to connect to the infotainment system.

3. What causes the B124C code to appear on a 2016 GMC Sierra?

The code can be caused by faulty wiring, a damaged USB port, a blown fuse, or a malfunctioning infotainment module.

4. How do I diagnose the B124C code on a 2016 GMC Sierra?

Start by inspecting the USB 2 port for physical damage, check the associated wiring and connections, and test the fuse or circuit related to the USB system.

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

Yes, other USB ports may still function normally since the code specifically relates to the USB 2 circuit.

6. How do I fix the B124C code on my 2016 GMC Sierra?

Repairs may involve replacing a damaged USB port, repairing or replacing faulty wiring, or resetting or updating the vehicleâ€™s infotainment system.

7. Is the B124C code a serious issue on a 2016 GMC Sierra?

No, it is not a critical issue, but it can affect the functionality of the USB 2 port, which may inconvenience users relying on it for charging or data transfer.

8. Can a blown fuse cause the B124C code on a 2016 GMC Sierra?

Yes, a blown fuse in the USB circuit can trigger this code and prevent the USB 2 port from functioning.

9. Will clearing the code B124C fix the issue permanently?

Clearing the code may temporarily remove it, but the underlying cause must be fixed to prevent it from returning.

10. How much does it cost to repair the B124C code on a 2016 GMC Sierra?

Repair costs vary depending on the issue, but replacing a USB port typically costs $50â€“$150, and wiring repairs or module replacements may cost more.