AutoCodes – Generic – B124B:04

B124B:04 Code - USB 1 Circuit Open

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:04 indicates USB 1 Circuit Open.
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.

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Code Popularity 324

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 19, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B124B:04 Description

The infotainment system has a USB port and an Auxiliary Audio Input Jack located in the center console. The receptacle assembly receives fused battery voltage and ground from the harness to power the internal hub device as well as providing additional amperage to power USB devices.
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.
The Diagnostic Trouble Code (DTC) will be set when the human machine interface control module does not detect the vehicle hub device.

OBDII Code B124B:04 - USB 1 Circuit Open - AutoCodes.com — B124B:04 Code - USB 1 Circuit Open

What does this mean?

What are the Possible Causes of the DTC B124B:04?

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:04?

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:04 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.

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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 vehicleâ€™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.