OBD Guide
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B124B

USB 1 Circuit

B124B is an OBD-II diagnostic trouble code meaning: USB 1 Circuit. Common causes: broken or damaged wires in usb 1 circuit, poor contact in usb connector 1. Estimated repair cost: $11–56.

Severity
✅ Low
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$11–56 (est.)

Symptoms

  • The multimedia system does not recognize connected devices
  • Intermittent operation of USB devices
  • No charging via USB port

Causes

  • Broken or damaged wires in USB 1 circuit
  • Poor contact in USB connector 1
  • Multimedia system malfunction
  • Short circuit in USB 1 circuit

How to Fix

  1. Check the integrity of the USB 1 wiring harness
  2. Inspect USB connector 1 for damage or oxidation
  3. Check voltage in USB 1 circuit
  4. Replace USB 1 connector or wiring harness if necessary

Related codes

B124AB124CU1000

FAQ

What does the B124B code mean?

B124B is an OBD-II diagnostic trouble code that indicates: USB 1 Circuit

What causes a B124B error code?

The most common causes of B124B include: Broken or damaged wires in USB 1 circuit; Poor contact in USB connector 1; Multimedia system malfunction; Short circuit in USB 1 circuit.

How do I fix a B124B diagnostic trouble code?

To fix B124B: Check the integrity of the USB 1 wiring harness. Inspect USB connector 1 for damage or oxidation. Check voltage in USB 1 circuit. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B124B?

Limited driving only, diagnose soon

How much does it cost to fix B124B?

The estimated repair cost for B124B is $11–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat