DTC C1627-08: CAN Time-Out 4WD: General Description
WARNING: This page is about a different car, the 2021 Kia Seltos. However, it is still accessible from the selected car via links, so may be relevant.
The HECU sends requirement data, such as torque reduction, the number of fuel cut cylinders, and the ESC control request, to the TCM through CAN bus line. The 4WD ECU performs the fuel cut function according to a request signal from the HECU and then retards an ignition timing. The TCM maintains current gear position during the ESC control period in order not to increase power which causes a kickdown shift.