License Plate Light Circuit Malfunction
The B0050 code means the vehicle's onboard diagnostic system has detected: License Plate Light Circuit Malfunction. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- easy
- Estimated cost
- $5 - $100 (parts and labor)
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Common Symptoms
- License plate not illuminated at night
- License plate light warning on dash
- Bulb out warning for rear lights
- Failed vehicle safety inspection
- Dim or flickering license plate light
Probable Causes (Ranked by Likelihood)
- Burned out license plate light bulb Very High
- Corroded license plate light socket High
- Water intrusion in license plate light housing Moderate
- Broken wire at license plate light Low
Step-by-Step Diagnostic Procedure
-
Inspect license plate light bulbs
-
Check sockets for corrosion or moisture
-
Test voltage at socket with tail lights on
-
Inspect wiring at license plate area for damage
-
Check for water in light housing
Frequently Asked Questions
Can I get a ticket for a burned out license plate light?
Yes. Most states require that the rear license plate be illuminated at night so it is readable. A burned out license plate light is a common reason for traffic stops.
Where is the license plate light located?
License plate lights are typically mounted in the rear bumper or trunk lid above the license plate. They are small housings that point downward to illuminate the plate.
Are license plate lights easy to replace?
Yes. Most license plate lights use small wedge-type bulbs like 168 or 194 that can be accessed by removing a small lens or housing with a screwdriver. It is one of the simplest bulb replacements.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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