Owners of 2011-12 Jeep Liberty SUVs may complain that their rear door lock knobs shudder, vibrate or rattle when the power door locks are actuated with the door switch or key fob.
One likely cause of the trouble, reports Chrysler, is the door lock actuator link rod making contact with the rubber grommet in the door module. Removing the door panel(s) and applying a special grease, part #05019059AA, to the grommet should eliminate the condition.