DTC P1A8C-19: DC/DC Converter Input Current Over Fail: 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.
The Low voltage DC-DC Converter (LDC) converts high voltage to low voltage and charges the auxiliary battery. The LDC is located in the Hybrid Powertrain Control Unit (HPCU).
The cooling system is to prevent the LDC from overheating.