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U0100 (TCM) - Lost Communication With ECM/Pcm

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
U0100 (TCM) - LOST COMMUNICATION WITH ECM/PCM

Description:  The transaxle control module (TCM) continuously monitors controller area network (CAN) for messages from the powertrain control module (PCM). This DTC is set when TCM stops receiving PCM messages for a set amount of time.
Possible Causes:  See the possible causes for DTC U0073.
Diagnostic Aids:  See the diagnostic aids for DTC U0001.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All   Refer to MODULE COMMUNICATIONS NETWORK .
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