I can't put my van into park while the engine is on. on 2002 Dodge Ram Van 3500

It thinks it's in reverse. I can however shift it into park once the engine is off but when I go to start it, it still thinks its in reverse and I have to shift into neutral to actual start the can. Any help would be great

Asked by for the 2002 Dodge Ram Van 3500
Check engine and transmission mounts