Pcm (ECM/TCM)
WARNING: This page is about a different car, the 2021 Hyundai Kona. However, it is still accessible from the selected car via links, so may be relevant.
The ESP sends request Data, such as torque reduction, the number of fuel cut cylinders, and the ESP (ESC) control request, to the PCM (ECM & TCM) through CAN bus line. The PCM (ECM) conducts the fuel cut according to the request from the ESP and then retards ignition timing. The PCM (TCM) maintains current gear position during the ESP (ESC) control in order to prevent a Kick down shift.