Conditions for Setting the DTC
WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
DTC P1779 sets if managed engine torque, net, signal is less than 1.5 percent or greater than 98.5 percent for greater than 2 seconds.