The automatic Cruze has a feature that puts the trans into a partial nuetral when at a stop.....a fuel saving trick.
Some of the cars were assembled with clutch plate variences that exceeded the specification.
What happens then is, while stopped, the trans will disengage/reengage about every three to five seconds.
The feeling is that of someone bumped the rear of the car.....each time it re-engages.
The operator often describes the feeling as a bump or, in this case, a vibration while stopped.
The repair is replacement of the clutch discs and various apply springs.....
Rob
