2002 Dodge Truck

Have you checked the transmission fluid? It only does it when you turned to the left? I think were starting to go in to the Twilight zone the only thing I can think of is that you have a loose connection on the wiring harness on the transmission when you turn left the wiring harness moves and causes of our function, once you get out of the truck and make sure the wiring harness is not flopping around.