I dont think the dealer would be able to electronically adjust the steering
rack. We have a GM Tech2 scanner and have never seen this option. When they
say its adjustable they mean as a software package.
That being said....I have a 2001 DTS that should be using the same
steering rack. When I got that car it did have a fairly loose feel. What
you can do is tighten up the preload on the rack. I think the spec is
45-90 degress on the preload. Mine was set at about 90 degrees...now it is
set at the tighter spec of about 45 degrees. The preload is on the rack
under the car.