B124C 2015 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 2015 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 2015 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 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 B124C 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 B124C 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 B124C 2015 GMC Sierra code?
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Frequently Asked Questions about B124C 2015 GMC Sierra Code
1. What does OBDII code B124C mean on a 2015 GMC Sierra?
Code B124C refers to an issue with the USB 2 circuit, indicating a malfunction or fault in the secondary USB port's electrical system.
2. What are the common symptoms of code B124C in a 2015 GMC Sierra?
Symptoms may include the USB port not charging devices, failure to recognize connected devices, or intermittent connectivity.
3. What causes the B124C code to appear on a GMC Sierra?
Common causes include a faulty USB port, damaged wiring or connectors, or an issue with the infotainment system hardware.
4. Can a blown fuse cause the B124C code in a 2015 GMC Sierra?
Yes, a blown fuse related to the USB circuit can trigger this code. Check the fuse box for any blown fuses associated with the USB system.
5. How do I diagnose the B124C code on my GMC Sierra?
Start by inspecting the USB port for physical damage, verifying the wiring and connectors, and checking fuses. Use a diagnostic scanner to confirm the code and check for related issues.
6. What tools are needed to fix the B124C code on a 2015 GMC Sierra?
You may need a multimeter to test electrical connections, a diagnostic scanner to read and clear codes, and basic tools to access and repair wiring or components.
7. Is replacing the USB port the only solution for code B124C?
Not necessarily. Sometimes the issue can be resolved by repairing damaged wiring, reconnecting loose connectors, or updating the infotainment system software.
8. Can software updates fix the B124C USB 2 Circuit code?
In some cases, updating the infotainment system software can resolve the issue if it’s caused by a software glitch rather than a hardware fault.
9. How much does it cost to repair the B124C code on a 2015 GMC Sierra?
Costs vary depending on the cause. Replacing a USB port may cost around $50-$150, while wiring repairs or dealership diagnostics might increase the total expense.
10. Can I still drive my GMC Sierra with the B124C code active?
Yes, the code does not affect the vehicle's drivability. However, it may limit the functionality of the secondary USB port until repaired.
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