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U0073 - Control Module Communication Bus A Off

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.
U0073 - CONTROL MODULE COMMUNICATION BUS A OFF

Description:  The traction battery control module (TBCM) continuously monitors the controller area network (CAN) for messages from the powertrain control module (PCM), transaxle control module (TCM) and antilock braking system (ABS) module.
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 .
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