Power Up/Down
WARNING: This page is about a different car, the 2015 Dodge Durango. However, it is still accessible from the selected car via links, so may be relevant.
The Drive Train Control Module (DTCM) will power up with an OFF/ON transition of the hardwired ignition switch input, or with the presence of active CAN C communications.
The DTCM will power down when the vehicle ignition switch transitions from ON to OFF, or there are no CAN C messages, or there are no system requirements that dictate the controller to remain active