I have had problems with what seems to be a height suspension. The cars height frequently gets very high. Looks like the back end is a racing car. When this happens the ride of the car also bounces all around and seems to have no shocks.

Any idea what this may be from? What can I do to fix?

 

Ok, nobody responded and I am feeling sorry for you.
You have the UL model with air suspension? Tell us more about the car.

 

In the past, there were problems with the rear height sensors. They got redesigned, because water was getting through and that was causing a malfunction... It's very strange to me that you have these problems, since your LS is the latest model year.

 

Does the car height get high by itselft while park or during driving? From my experience, if carry two peoples in the back and they got out once car shut off then the back will get high as car didn't have a chance to readjust itself. However, it's will auto level once restart the car and I'm recommend to push the back of the car to test boucinesss once it's level and check for shock leakage due to blow suspension as that what happen to me. Hope this help.