DTC P0880-00: TCM Power Input Signal: 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 PCM monitors that supplied voltage to the PCM from the battery ("HOT AT ALL TIMES", "HOT IN ON OR START") and output voltage of the PCM (solenoid power).