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U0101 - Lost Communication With Transaxle Control Module (TCM)

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2007 Mercury Mountaineer, 2007 Mercury Monterey, 2007 Mercury Montego, 2007 Mercury Milan, and 2007 Mercury Mariner. However, it is still accessible from the selected car via links, so may be relevant.
U0101 - LOST COMMUNICATION WITH TRANSAXLE CONTROL MODULE (TCM)

Description:  The powertrain control module (PCM) continuously monitors the controller area network (CAN) for messages from the TCM. This DTC sets when the PCM does not receive the TCM message within the defined amount of time.
Possible Causes: 
  • Damaged CAN communication bus circuit
Diagnostic Aids:  Network DTC concerns occur during module-to-module communication. For additional description and operation of the vehicle communication network, refer to the appropriate MODULE COMMUNICATIONS NETWORK article.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
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