B124C 2018 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 2018 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.
Code B124C 2018 GMC Sierra Description
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.
What are the Possible Causes of the DTC B124C 2018 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 2018 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 2018 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 2018 GMC Sierra code?
Need more information on how to fix the B124C 2018 GMC Sierra code? Get Access to Factory Service Manuals
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Frequently Asked Questions about B124C 2018 GMC Sierra Code
1. What does OBDII code B124C mean on a 2018 GMC Sierra?
Code B124C refers to a fault in the USB 2 circuit, indicating an issue with the wiring, connection, or hardware related to the second USB port.
2. What are the symptoms of code B124C in a 2018 GMC Sierra?
Common symptoms include a non-functional USB 2 port, inability to charge devices, or failure to recognize connected devices.
3. What causes code B124C in a 2018 GMC Sierra?
Potential causes include damaged wiring, a faulty USB hub, loose or corroded connections, or a defective USB port module.
4. Can code B124C affect other vehicle systems in a 2018 GMC Sierra?
Typically, this code only affects the USB 2 functionality and does not impact other critical vehicle systems.
5. How do you diagnose code B124C in a 2018 GMC Sierra?
Diagnosis involves inspecting the USB 2 circuit wiring, checking for loose or corroded connections, and testing the USB hub or port for faults.
6. Is code B124C easy to fix on a 2018 GMC Sierra?
Yes, in most cases, repairing a loose connection or replacing a faulty USB hub resolves the issue.
7. Can I clear code B124C without fixing the issue?
Clearing the code without addressing the underlying problem may cause it to reappear when the system detects the fault again.
8. How much does it cost to repair code B124C on a 2018 GMC Sierra?
Repair costs can vary but typically range from $50 to $150, depending on whether the USB port or hub needs replacement.
9. Can I still use my vehicle normally with code B124C present?
Yes, the vehicle remains drivable, but the USB 2 port functionality will be compromised.
10. What tools are needed to troubleshoot code B124C in a 2018 GMC Sierra?
You’ll need an OBDII scanner, a multimeter for electrical testing, and basic tools to inspect and repair wiring or connections.
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