Condition 2:

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

During low speed normal operation, pressure switches indicate loss of pressure.
Engine running with engine speed less than 1000 RPM.
Transmission turbine speed is less than 1000 RPM.
Transmission output speed is less than 200 RPM.
Forward or REVERSE range is selected.