Left License Plate Light Circuit Malfunction
The B0066 code means the vehicle's onboard diagnostic system has detected: Left License Plate Light Circuit Malfunction. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- easy
- Estimated cost
- $5 - $80 (parts and labor)
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Common Symptoms
- Left license plate light not illuminating
- Dark license plate at night
- Police citation for unlit plate
- Failed vehicle inspection
Probable Causes (Ranked by Likelihood)
- Burned out license plate bulb Very High
- Corroded socket from road spray High
- Cracked or water-filled housing Moderate
- Damaged ground wire at plate bracket Low
Step-by-Step Diagnostic Procedure
-
Inspect license plate bulb
-
Check socket for corrosion
-
Verify ground at plate bracket
-
Test voltage at connector
Frequently Asked Questions
Can I get a ticket for this?
Yes, all states require plate illumination at night.
Why do license plate lights fail often?
They are mounted low and exposed to road spray, salt, mud, and debris.
Are LED plate lights legal?
Yes, in most states as long as they emit white light.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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