CEL: local parts store pulled code U11E9 “Lost Communication with AGS”
This site was very helpful to point out the following:
Most likely the AGS, active grille shutter, is fine and the real problem is the AAD, active air dam. So to verify the AGS works just start the vehicle and look through the grille. If the grille shutters cycle through their full range of motion you know you have power, ground and nothing stuck in the shutters. Then just unplug the AAD and to reset the code and clear the CEL unplug the negative terminal on the battery for 20 minutes. Now CEL gone and remote start works on these 15 degree mornings.