DTC B1242-13: Evaporator Sensor Open (High): 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.
Evaporator sensor is located on Heating, Ventilation and Air Conditioning (HVAC) unit and detects the evaporator core temperature to prevent compressor operation by not supplying power to compressor and prevent evaporator from freezing by excessive cooling.