OBD Guide
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B2394

Flash To Pass / Optical Horn Switch Circuit Stuck

B2394 is an OBD-II diagnostic trouble code meaning: Flash To Pass / Optical Horn Switch Circuit Stuck. Common causes: high beam button malfunction, open or short circuit in wiring harness. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • High beam does not turn on
  • High beam turns on spontaneously
  • Flashing headlights without pressing a button

Causes

  • High beam button malfunction
  • Open or short circuit in wiring harness
  • Contact corrosion
  • Problems with the lighting control module

How to Fix

  1. Check the high beam switch for mechanical damage
  2. Check the integrity of the wiring harness and contacts
  3. Scan the lighting control module for errors
  4. Replace the button or wiring harness if necessary

Related codes

B2395B2396

FAQ

What does the B2394 code mean?

B2394 is an OBD-II diagnostic trouble code that indicates: Flash To Pass / Optical Horn Switch Circuit Stuck

What causes a B2394 error code?

The most common causes of B2394 include: High beam button malfunction; Open or short circuit in wiring harness; Contact corrosion; Problems with the lighting control module.

How do I fix a B2394 diagnostic trouble code?

To fix B2394: Check the high beam switch for mechanical damage. Check the integrity of the wiring harness and contacts. Scan the lighting control module for errors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2394?

Limited driving only, diagnose soon

How much does it cost to fix B2394?

The estimated repair cost for B2394 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat