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U1556 Code – Chassis Control Module Lost Communication With Trailer Brake Power Control Module On LIN Bus

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What are the Possible Causes of the Code U1556?
  • Faulty Trailer Brake Power Control Module
    • Trailer Brake Power Control Module harness is open or shorted
  • Trailer Brake Power Control Module circuit poor electrical connection
  • Faulty Chassis 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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