Every once in a while when my wife is driving, randomly the "transmission above temp" comes on and the engine revs. She puts the truck in neutral, shuts the truck off, then back on. The above temp goes away and the reving stops. This also happens randomly when she goes to park after a drive. All fluids are filled, and the trans fluid is not burnt. The fact that once she turns the truck off and back on, and the temp thing stays off makes me think the transmission is not overheating and it is something else. Anyone have any ideas, or hear about this before.