← Back to Search Severity: Medium

B0405

B0405: Exterior Lighting Malfunction

Fix Cost
$50 - $200
Parts & Labor
Difficulty
3/5
Moderate
1-2 hours
DIY Possible?
✅ Yes
Save money
Category
Body
System

📖 What Does B0405 Mean?

This code indicates a problem with the exterior lighting system, such as a faulty headlight, taillight, or turn signal.
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Symptoms

  • Dim or inoperative exterior lights
  • warning lights on dashboard
  • difficulty seeing at night
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Common Causes

  • Faulty headlight or taillight bulb
  • wiring issue
  • blown fuse
  • or malfunctioning lighting control module
Fix Guide
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Possible Solutions

1. Check and replace faulty bulb(s), 2. Inspect and repair or replace wiring, 3. Check and replace blown fuse, 4. Update or replace lighting control module if necessary

Common Questions About B0405

Can I drive with code B0405?

You can drive for a short time, but should address code B0405 soon to avoid worsening the problem or failing an emissions test.

How much does it cost to fix code B0405?

The estimated repair cost for code B0405 is between $50 and $200. This includes parts and labor. Prices may vary based on your vehicle's make and model.

Is code B0405 easy to fix myself?

This repair is considered moderate. It may require specialized tools or significant disassembly. If you are not an experienced mechanic, professional help is recommended.

Required Parts

Tools

Multimeter Torx screwdriver Pliers
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Need a Pro?

Complex codes like B0405 can be tricky. Don't risk it if you're unsure.

Quick Stats

Severity Medium
DIY Friendly Yes
Est. Time 1-2 hours
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Related Diagnostic Codes

Other codes that may appear with B0405

💡 Why These Codes Are Related:

  • Similar Issues: Same root cause or component failure
  • Related Problems: Often occur together due to system interactions
  • Sequential Codes: Progressive failure stages or multiple sensors
  • Same System: Components within the same automotive system