I have read that is the orange wrench light blinks on the dash, there will be a stored TCM code and it will stay there even if the wrench light disappears after cycling the key. Anyone know if there is truth to this?

I need to check and see because of my trans issues right now after that light popped up and went away. Also there is jack in the menus for Trans Diagnostics and in Vehicle Controls and Special Functions. Why is this?