B0058 low

Side Marker Light Circuit Left Malfunction

The B0058 code means the vehicle's onboard diagnostic system has detected: Side Marker Light Circuit Left Malfunction. This is a low severity code.

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Keep driving?
Yes, but fix soon
DIY difficulty
easy
Estimated cost
$5 - $100 (parts and labor)
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Common Symptoms

  • Left side marker light not illuminating
  • Side marker warning on dash
  • Vehicle less visible from the side at night
  • Left fender marker dark when headlights on
  • Bulb out warning for exterior lighting

Probable Causes (Ranked by Likelihood)

  • Burned out left side marker bulb Very High
  • Corroded side marker socket High
  • Water intrusion in side marker housing Moderate
  • Wiring fault to left side marker Low

Step-by-Step Diagnostic Procedure

  1. Inspect left side marker bulb

  2. Check bulb socket for corrosion

  3. Test voltage at socket with parking lights on

  4. Inspect side marker housing for moisture

  5. Check wiring to side marker light

Frequently Asked Questions

What is a side marker light?

Side marker lights are small amber (front) or red (rear) lights mounted on the fenders or bumpers that make the vehicle visible from the side, especially at night or in low visibility conditions.

Are side marker lights required by law?

Yes. US federal regulations require side marker lights on all vehicles. They must be amber on the front and red on the rear. Failure to have working side markers can result in a citation.

Can I replace a side marker bulb myself?

Yes. Side marker bulbs are typically very easy to replace. Most can be accessed by twisting the socket out from behind the fender or by removing a small lens cover.

Sources

This page is built from documented references. Verify against your own service info before repair work.

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