DTC C161C-86: CAN Signal Error HCU/VCU/FCU: General Description
WARNING: This page is about a different car, the 2024 Kia Sorento. However, it is still accessible from the selected car via links, so may be relevant.
Hybrid control system is connected by CAN communication with main module HCU and each system control module.
Besides HCU is uses brake switch etc. for system control.