U0100 Code – Lost Communication with Engine Control Module/Powertrain Control Module

What are the Possible Causes of the Code U0100?
  • Check for more codes
  • Faulty Engine Control Module (ECM) / Powertrain Control Module (PCM)
  • ECM/PCM harness is open or shorted
  • ECM/PCM circuit poor electrical connection
  • 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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