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Engine-Codes – GMC – B124C 2017 GMC Sierra

B124C 2017 GMC Sierra Code - USB 2 Circuit

Quick Answer

The B124C diagnostic trouble code (DTC) for a 2017 GMC Sierra refers to an issue with the USB 2 circuit in the vehicle. Common causes include Damaged or frayed wiring in the USB circuit, A faulty USB port or connector, Malfunctioning USB module. 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
B124C 2017 GMC Sierra indicates USB 2 Circuit.
Common causes
Common causes include Damaged or frayed wiring in the USB circuit, A faulty USB port or connector, Malfunctioning USB module.
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 13, 2024
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Code B124C 2017 GMC Sierra Description

The B124C diagnostic trouble code (DTC) for a 2017 GMC Sierra refers to an issue with the USB 2 circuit in the vehicle. This code indicates that there is a malfunction or fault in the circuit that controls the USB port, which is commonly used for connecting external devices such as smartphones, tablets, or USB drives to the vehicle's infotainment system.

OBDII Code B124C 2017 GMC Sierra - USB 2 Circuit
B124C 2017 GMC Sierra Code - USB 2 Circuit

Common Causes of B124C 2017 GMC Sierra

  1. Damaged or frayed wiring in the USB circuit.
  2. A faulty USB port or connector.
  3. Malfunctioning USB module.
  4. Software glitches or updates affecting the USB functionality.
  5. Water or moisture damage to the USB components.

Symptoms of B124C 2017 GMC Sierra

  1. USB port not recognizing connected devices.
  2. Inability to charge devices through the USB port.
  3. Error messages related to the USB connection on the infotainment system.
  4. Intermittent connectivity issues with connected devices.

How to Fix B124C 2017 GMC Sierra

  1. Begin by inspecting the wiring and connectors in the USB circuit for any signs of damage. Repair or replace any damaged components.
  2. Test the USB port and module for functionality. Replace any faulty parts as needed.
  3. Check for software updates or glitches that may be affecting the USB system. Perform any necessary software updates or resets.
  4. Clear the DTC from the vehicle's system using a diagnostic tool to reset the USB circuit.
  5. Test the USB port with various devices to ensure proper functionality after repairs.

Cost to Fix B124C 2017 GMC Sierra

The typical repair costs for addressing a USB 2 circuit issue in a 2017 GMC Sierra can range from $100 to $300, depending on the extent of the problem and the parts that need to be replaced. This estimate includes both parts and labor. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate based on your specific location and vehicle.

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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 2017 GMC Sierra Code

1. What does the OBDII code B124C mean on a 2017 GMC Sierra?

The code B124C refers to an issue with the USB 2 circuit, indicating a fault in the secondary USB port or its associated wiring.

2. What are common symptoms of the B124C code in a 2017 GMC Sierra?

Symptoms may include a non-functional USB port, inability to charge devices, or failure to connect to infotainment systems through the secondary USB port.

3. What causes the B124C code on a 2017 GMC Sierra?

Common causes include a damaged USB port, faulty wiring, a blown fuse, or a malfunctioning infotainment system module.

4. Can a loose cable cause the B124C code?

Yes, a loose or disconnected USB cable can trigger the B124C code by disrupting the circuit.

5. How do I troubleshoot the B124C code on my 2017 GMC Sierra?

Start by inspecting the USB port and its wiring for visible damage, check the associated fuses, and verify the connections to the infotainment system.

6. Is the B124C code serious on a 2017 GMC Sierra?

While it doesn’t affect vehicle performance, it can limit functionality of the USB port and connected devices, which may be inconvenient.

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

Yes, other USB ports not tied to the USB 2 circuit should still function normally unless they share the same fault.

8. What repairs are typically needed to fix the B124C code?

Repairs may include replacing the USB port, repairing damaged wiring, replacing a blown fuse, or reprogramming the infotainment system.

9. How much does it cost to fix the B124C code on a 2017 GMC Sierra?

The cost depends on the specific issue but typically ranges from $50 to $200 for inspection, wiring repairs, or USB port replacement.

10. Can I fix the B124C code myself on my 2017 GMC Sierra?

If you’re comfortable with basic electrical work, you can inspect and replace the USB port or wiring, but more complex issues may require professional help.

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