DTC P0845-00: Transmission Fluid Pressure Sensor/Switch 'B' Circuit: General Description
WARNING: This page is about a different car, the 2021 Kia Soul. However, it is still accessible from the selected car via links, so may be relevant.
The driven pulley pressure sensor is to feedback the hydraulic of the drive pulley, and the PCM is to compare the difference between the target hydraulic and the actual hydraulic and to control the hydraulic. The driven pulley pressure uses 5V power by the piezo type.