DTC P0904-14: Select 1 Position Sensor Short To Ground/Open: General Description
WARNING: This page is about a different car, the 2021 Kia Niro. However, it is still accessible from the selected car via links, so may be relevant.
The DCT system uses two clutches and two clutch motors. The TCM operates clutch and uses clutch motor to select optimum gear for driving conditions.