B3889 Code – Trailer Brake Lamps

What are the Possible Causes of the Code B3889?
  • Faulty Trailer Brake Lamps
  • Trailer Brake Lamps harness is open or shorted
  • Trailer Brake Lamps circuit poor electrical connection
  • Faulty Trailer Lighting Control Module
  • Need help with this OBD II code? Our mechanics are available within west Michigan to help. Outside of our service area? Visit our Car Help Section where you can ask questions and get answers.

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