front seat hydraulics on 2003 Cadillac Escalade

I hear it click but it won't move up or down. It will go all the other ways up up and tilted up. Do you have to replace the entire seat or can you buy just the hydraulics or is there something that I am missing? Please any info on this is appreciated.

Asked by for the 2003 Cadillac Escalade
I think you seat is electric and sometimes one of the plugs under the seat will become loose or disconnected, try that first