This sounds more like the control module than a sensor. A vehicle speed sensor will cause trouble shifting, but normally won't cause a problem putting it in gear. Has the check engine light come on?
Also, as far as the trans safety mode, it's called a limp mode. The trans will stay in one gear to get you home or to a shop. I don't believe an overheat would cause it to go to that mode.
Friday, August 21st, 2009 AT 11:18 PM