I have a 2004 tahoe 5.3l. The dic keep saying left rear door ajar. I replaced the door lock actuator, the bcm and had it reprogrammed and it still did not fix the problem. What I have noticed that it will work intermittently until I hit a bump and it will stop working again then work again after hitting another bump. I check all grounds and am at a loss at this point. Anyone have any suggestions ?