power lift gate

My power liftgate does not open or close. When I push the button the gate unlatches and chimes 3 times but does not move open or close. It's the same if I use the remote, inside button, or button on the gate. I tried the resetting procedure in the manual a couple of times but no change. Any...

I know there are some good threads on remote starts, however, nothing is 100% clear about adding the remote start if you already have the power lift gate option. Has anyone added the remote start to a 2011 that had the power lift gate option already in it? Did you have to rely on the dealer...