No it doesn't actually reprogram a new calibration into a Chrysler PCM .... It will however allow you to go into the Skim module and perform a pcm replacement function in where it will ask you for the pin code and once entered it will take the vin out of the skim and program the pcm with it. Then it will transfer the key information over to the pcm, next perform a key cycle and it will start. This is providing that the used pcm has the correct part number and correct calibration for the vehicle you are working on. Also you must use the Chrysler adapter for a 2001.