← Back to Search Severity: Medium

B0173

B0173: Exterior Light Malfunction

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

📖 What Does B0173 Mean?

The body control module (BCM) has detected a malfunction in the exterior lighting system, such as a faulty headlight, taillight, or turn signal.
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Symptoms

  • Dim or inoperable exterior lights
  • flickering lights
  • or lights that do not turn off when the ignition is turned off.
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Common Causes

  • Faulty exterior light bulb
  • wiring issue
  • or body control module malfunction.
Fix Guide
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Possible Solutions

1. Inspect and replace faulty exterior light bulbs. 2. Check and repair any damaged or corroded wiring. 3. Update the body control module software if necessary.

Common Questions About B0173

Can I drive with code B0173?

You can drive for a short time, but should address code B0173 soon to avoid worsening the problem or failing an emissions test.

How much does it cost to fix code B0173?

The estimated repair cost for code B0173 is between $50 and $200. This includes parts and labor. Prices may vary based on your vehicle's make and model.

Is code B0173 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
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Need a Pro?

Complex codes like B0173 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 B0173

💡 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