DTC 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 DTC P073100 is displayed, when it detects that the valve does not correspond. (output speed * gear ratio of 1st not equal to input speed)
This fault is a major cause of mechanical faults which is a stuck control valve or a faulty solenoid valve.