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DTC U0073: Control Module Communication Bus Off

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
U0073 - CONTROL MODULE COMMUNICATION BUS OFF

Description:  The TBCM continuously monitors the CAN network for messages from the PCM, TCM and ABS.
This DTC is set when the message received from the PCM, TCM or ABS is out of expected range or contains invalid data.
Possible Causes: 
  • Damaged CAN communication bus circuit.
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 .