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U1503 Code – Implausible Message Data Length Received From FCM

What are the Possible Causes of the Code U1503?
  • Faulty Totally Integrated Power Module (TIPM)
  • Totally Integrated Power Module harness is open or shorted
  • Totally Integrated Power Module circuit poor electrical connection
  • Faulty Anti-Lock Brakes (ABS) 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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