DTC C1109-13: IG1 Open - MDPS Fail Safe: General Description
WARNING: This page is about a different car, the 2023 Kia Seltos. However, it is still accessible from the selected car via links, so may be relevant.
The Hydraulic Electronic Control Unit (HECU) monitors the system (battery) voltage. The normal system voltage range is essential for controlling the ABS system as intended.