my 2014 cruze Lt started making a weird knocking noise, from the rear passenger side when I am going at a slower speed over any bumps on the road it doesn't do it when I am going faster than 60km or on the highway. There's nothing in my trunk that can cause it and the seat belt on the back seat isn't hitting anything. I took it into the dealership today and apparently they couldn't hear it or find anything wrong. I know my car never made this sound before. Anyone else experience this and found out the cause it's driving me crazy!!!