B124B 2014 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 2014 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.
Code B124B 2014 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 B124B 2014 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 2014 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 2014 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 2014 GMC Sierra code?
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Frequently Asked Questions about B124B 2014 GMC Sierra Code
1. What does the OBDII code B124B mean on a 2014 GMC Sierra?
The code B124B indicates an issue with the USB 1 Circuit, which relates to the vehicle’s USB port functionality.
2. What are the symptoms of code B124B in a 2014 GMC Sierra?
Common symptoms include the USB port not recognizing devices, inability to charge devices, or intermittent USB functionality.
3. What causes the B124B code to appear?
Causes can include a faulty USB port, damaged wiring or connectors in the USB circuit, or a malfunctioning infotainment system.
4. How do I troubleshoot the B124B code?
Start by checking the USB port for physical damage, inspect the wiring and connectors for corrosion or damage, and verify the infotainment system software is up to date.
5. Can a blown fuse cause the B124B code?
Yes, a blown fuse related to the USB circuit can cause this code. Check the fuse box for any blown fuses and replace them if necessary.
6. Is the issue likely to be the USB device itself?
It’s possible. Test the USB port with a different device and cable to rule out compatibility issues with the original device.
7. How do I fix the B124B code on my GMC Sierra?
Depending on the issue, repairs may involve replacing the USB port, repairing damaged wiring, or updating the infotainment system software.
8. Can the B124B code cause other problems in the vehicle?
Generally, the code only impacts USB-related functionality and does not affect other systems.
9. How much does it cost to fix the B124B code?
Repair costs vary but typically range from $50 to $300, depending on whether you need a simple wiring fix or a USB port replacement.
10. Can I clear the B124B code without repairs?
Clearing the code without addressing the root cause may result in the code returning. Fixing the underlying issue is recommended.
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