DTC U0140: Lost Communication With Body Control Module: Description
WARNING: This page is about a different car, the 2014 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
The SJB is also identified as the GEM.
The PSCM monitors the HS-CAN bus when the ignition has been on for more than 5 seconds, when the voltage to the PSCM is greater than 6.5 volts and when there are no DTCs present that are inhibiting PSCM operation.
DTC U0140:00 (Lost Communication with the Body Control Module: No Sub Type Information) - This DTC sets when communication between the PSCM and the BCM module fails. The PSCM has not received the alternator signal from the BCM.