DTC U0140: Lost Communication With Body Control Module: Description

WARNING: This page is about a different car, the 2012 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.

The Smart Junction Box (SJB) is also identified as the Generic Electronic Module (GEM) or Body Control Module (BCM).

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.