DTC Description
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.
C1259-11 sets when the EPS ECU (MDPS = Motor Driving Power Steering Control Module) detects the column turning by more than 680° from 0 point or when it detects a fault in the Motor Position Sensor.