Two things to look for that I have done. First check and see if the rubber stop is there above the latch mounted to the body. If it is loosen the screw and rotate it. They have a tendency to become flat after a long period of the tailgate resting in on spot. Second check the tailgate hinges, make sure the screws are tight. Good way to check tailgate for hing wear, is open tailgate grab bottom end by door handle and wiggle it up and down. Hope this helps.