DTC P1836: Bleed Pressure Line Test Error: General Description
WARNING: This page is about a different car, the 2014 Hyundai Santa Fe Sport and 2013 Hyundai Santa Fe Sport. However, it is still accessible from the selected car via links, so may be relevant.
The 4WD ECU forcibly makes a motor pump turn around in case of need for emitting its air in the motor pump.