Its intermittent and started the day after I bought the car I brought it back to the dealership, and of course, it wouldn't repeat clunk. Sometimes the clunk is so violent, it shakes the entire car. I'm waiting for the tranny to explode when my wife is driving it with my grandkids in it. Took it back to dealership and they checked it out and said they couldn't detect anything and there no bulletin on record Told me I will have to drive it until the tranny fails and then they can fix. Of course that will be after the warranty runs out and the attitude will be "It sucks to be you" I'm really disappointed in this vehicle.