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Engine-Codes – Generic – B124B:04

B124B:04 Code - USB 1 Circuit Open

Quick Answer

The B124B:04 diagnostic trouble code (DTC) indicates a problem with the USB 1 circuit being open in the vehicle. Common causes include Damaged or frayed wiring leading to the USB 1 port, A faulty USB port itself, Corrosion or debris in the connector leading to poor electrical contact. 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:04 indicates USB 1 Circuit Open.
Common causes
Common causes include Damaged or frayed wiring leading to the USB 1 port, A faulty USB port itself, Corrosion or debris in the connector leading to poor electrical contact.
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 12, 2024
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Code B124B:04 Description

The B124B:04 diagnostic trouble code (DTC) indicates a problem with the USB 1 circuit being open in the vehicle. This means that there is a break or interruption in the electrical circuit that connects the USB 1 port to the vehicle's onboard computer system. The USB 1 port is typically used for connecting external devices such as smartphones, tablets, or USB drives to the vehicle's entertainment or information system.

OBDII Code B124B:04 - USB 1 Circuit Open
B124B:04 Code - USB 1 Circuit Open

Common Causes of B124B:04

  1. Damaged or frayed wiring leading to the USB 1 port.
  2. A faulty USB port itself.
  3. Corrosion or debris in the connector leading to poor electrical contact.
  4. Issues with the vehicle's onboard computer system affecting the USB circuit.
  5. Physical damage to the USB port from misuse or accidents.

Symptoms of B124B:04

  1. Inability to charge devices through the USB 1 port.
  2. Devices not being recognized or connected to the vehicle's entertainment system.
  3. Error messages related to the USB 1 port on the vehicle's display screen.
  4. Loss of functionality for features that rely on the USB 1 port, such as music playback or navigation.

How to Fix B124B:04

  1. Begin by visually inspecting the wiring leading to the USB 1 port for any signs of damage or wear.
  2. Check the connector for corrosion or debris that may be affecting the electrical connection.
  3. Test the USB port itself for functionality and replace if necessary.
  4. Use a multimeter to check for continuity in the circuit and identify the location of the open circuit.
  5. Repair or replace any damaged wiring, connectors, or components to restore the circuit's integrity.

Cost to Fix B124B:04

The typical repair costs for addressing a USB 1 circuit open issue can vary depending on the specific cause of the problem and the extent of the repair needed. In general, parts for this repair may range from $50 to $200, with labor costs adding an additional $100 to $300. However, it's important to note that these are rough estimates, and actual costs can vary based on factors such as location, vehicle make and model, and the rates charged by individual auto repair shops. It's recommended to obtain quotes from local shops to get a more accurate cost 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:04 Code

1. What does the OBDII code B124B:04 mean?

Code B124B:04 indicates an open circuit in USB 1, meaning the electrical connection for the USB port is disrupted.

2. What are the symptoms of code B124B:04?

Symptoms may include the USB port not functioning, inability to charge devices, or failure to connect to infotainment systems.

3. What causes the USB 1 Circuit Open issue?

Common causes include damaged wiring harnesses, loose or corroded connectors, a faulty USB port, or issues with the infotainment system.

4. Can I still use my vehicle if code B124B:04 is present?

Yes, this code typically does not affect drivability, but it may limit your ability to use USB-related functions.

5. How can I diagnose code B124B:04?

Inspect the USB port, wiring, and connectors for physical damage, corrosion, or disconnections. Use a multimeter to check for continuity in the circuit.

6. How is code B124B:04 fixed?

Repairs may include replacing damaged wiring, reconnecting loose connectors, or replacing a defective USB port or infotainment module.

7. Can I clear code B124B:04 by resetting the system?

Clearing the code without addressing the underlying issue may temporarily erase it, but the code will likely return if the problem persists.

8. Is code B124B:04 covered under warranty?

The coverage depends on your vehicle’s warranty terms, but electrical issues like this may be included if the vehicle is still under warranty.

9. Can a blown fuse cause code B124B:04?

Yes, a blown fuse in the USB circuit could trigger this code. Check the fuse box for any blown fuses related to the USB system.

10. How much does it cost to repair code B124B:04?

Repair costs vary depending on the issue. Replacing a USB port may cost $50-$150, while wiring repairs or infotainment system replacements could be more expensive.

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