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Engine-Codes – GMC – B124B 2014 GMC Sierra

B124B 2014 GMC Sierra Code - USB 1 Circuit

Quick Answer

The B124B diagnostic trouble code (DTC) for a 2014 GMC Sierra refers to an issue with the USB 1 circuit in the vehicle. Common causes include Faulty USB port, Damaged wiring or connectors, Malfunctioning USB controller. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
B124B 2014 GMC Sierra indicates USB 1 Circuit.
Common causes
Common causes include Faulty USB port, Damaged wiring or connectors, Malfunctioning USB controller.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code B124B 2014 GMC Sierra Description

The B124B diagnostic trouble code (DTC) for a 2014 GMC Sierra refers to an issue with the USB 1 circuit in the vehicle. This code indicates that there is a malfunction or fault in the circuit that is responsible for the USB 1 port in the vehicle. The USB 1 port is commonly used for connecting external devices such as smartphones, tablets, or music players to the vehicle's infotainment system.

OBDII Code B124B 2014 GMC Sierra - USB 1 Circuit
B124B 2014 GMC Sierra Code - USB 1 Circuit

Common Causes of B124B 2014 GMC Sierra

  1. Faulty USB port
  2. Damaged wiring or connectors
  3. Malfunctioning USB controller
  4. Issues with the vehicle's ECU
  5. Water or moisture damage to the USB circuit

Symptoms of B124B 2014 GMC Sierra

  1. USB 1 port not charging devices
  2. Inability to play music through USB connection
  3. Error messages on the infotainment system related to USB connectivity
  4. Devices not being recognized when plugged into the USB port

How to Fix B124B 2014 GMC Sierra

  1. Begin by inspecting the USB 1 port and checking for any visible damage or loose connections. Repair or replace the port if necessary.
  2. Check the wiring and connectors associated with the USB circuit for any signs of damage. Repair or replace any faulty components.
  3. Test the USB controller to ensure it is functioning correctly. Replace it if needed.
  4. If the issue persists, diagnose the vehicle's ECU for any faults related to the USB circuit and address accordingly.
  5. Once the repairs are completed, clear the DTC and test the USB 1 port to ensure it is working properly.

Cost to Fix B124B 2014 GMC Sierra

The typical repair costs for addressing the B124B code related to the USB 1 circuit in a 2014 GMC Sierra can vary depending on the extent of the issue and the specific repairs needed. In general, the cost for parts and labor to address this type of electrical issue can range from $150 to $500. However, it is important to note that the exact cost can vary based on the location of the repair shop, the make and model of the vehicle, and the hourly labor rates charged. It is recommended to obtain quotes from local auto repair shops to get a more accurate estimate for this repair.

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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 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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