Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
either one of the air lines was damaged during install or the suspension compressor has gone bad. the compressors are common to fail. i have replaced so many i have lost count. but if he just replaced the rear shocks then i would bet a line was damaged or came undone.
it is pretty quite normally it is located near the rear left wheel so if you have the car on but not running you should be able to hear it if your outside the vehicle and crouched by the rear left wheel.
they could be but i wouldnt immediately assume so if the error message popped up next day from the shop. what corner of the vehicle is lower than the other?
then i would say your front shocks are fine. but the rear left is the one with the issue. the system is independent. meaning each shocks has its own line. i bet the line is either damaged or disconnected. and the compressor is probably fine if only one corner is sagging. i would take it back to the shop and have them inspect it to make sure all the lines are connected.
sounds like the compressor has gone bad. i apologize for the late response i have had internet problems the past couple days.
i would replace ythe compressor.