DTC P1957-21: AWD Pressure Sensor-Signal Error: 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 All-Wheel Drive (AWD) ECU controls the hydraulic motor so that the target hydraulic pressure corresponding to the rear wheel distribution torque that is intended to be controlled by receiving the current pressure value from the pressure sensor mounted on the coupling. The AWD ECU checks the voltage of the power line and signal line of the pressure sensor to determine if there is any abnormality in the pressure sensor and wiring, and stores warning lamp lights and DTCs.