DTC U0140: Lost Communication With Body Control Module: Description

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.