Park - Engine Running: Notes
WARNING: This page is about a different car, the 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
When the gear selector lever is in the Park (P) position and the engine is running, fluid is drawn into the fluid pump and line pressure is directed to the pressure regulator valve.