Been experiencing the rear of the car dropping as low as it could get when parked and engine off. Once started and on the move, it does come back up to normal ride level. What would cause it to drop? Thanks for any help.

 

Most cadillac with magnetic ride suspension the shock last only 103,000 miles after that it will start displaying service ride control and service stability so rear shock are expensive most people swap over to regular shocks and plug a special connectors to where the wires where connected so not see the service ride control messages