What will happen if the hose is off of a Cadillac CTS?

If the hose is off a Cadillac CTS, it could lead to various issues depending on which hose is disconnected. For example, if it's a coolant hose, the engine could overheat, potentially causing severe damage. If it's a vacuum hose, the engine might run poorly or stall. In either case, driving the vehicle in such conditions should be avoided until the hose is properly reattached.