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U0101 (Pcm) - Lost Communication With Transaxle Control Module (TCM)

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.
U0101 (PCM) - LOST COMMUNICATION WITH TRANSAXLE CONTROL MODULE (TCM)

Description:  The powertrain control module (PCM) continuously monitors controller area network (CAN) for messages from the TCM. This DTC is set when the PCM does not receive the TCM message within the defined 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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