Sensors will not prevent it from going into reverse. There are an input speed sensor and output speed sensor. When one is defective, or when the computer detects slippage based on these two sensor readings, it defaults to "limp-in" mode which gives you Park, Reverse, Neutral, and Second gears. These are hydraulically controlled without involvement of the computer.
Caradiodoc
Friday, August 7th, 2009 AT 8:07 PM