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Home >> Ford >> 2021 >> Expedition XL, RWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Memory Modules >> Engine Controls - Powertrain DTC Charts & Descriptions (Except Diesel & Hybrid) >> Diagnostic Trouble Code (DTC) Charts And Descriptions >> U0101 - Lost Communication With TCM

U0101 - Lost Communication With TCM

DTC DESCRIPTION U0101 - LOST COMMUNICATION WITH TCM

Description:  The PCM continuously monitors the controller area network (CAN) for messages from the transmission control module (TCM). This DTC sets when the PCM does not receive the TCM message within the defined amount of time.
Possible Causes: 
  • Communication error
Diagnostic Aids:  Check for other PCM DTCs or PCM related symptoms. Diagnose all other PCM DTCs or PCM related symptoms first.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All GO to Pinpoint Test QA.