To do it requires the Chrysler DRBIII or Starscan scanner, depending on what year car you have, to copy the secret "handshake' code from the PCM and write it into the new blank SKREEM.

Here is a relevant related thread: https://www.crossfireforum.org/forum...-module-2.html

cojoman had significant problems with a Chrysler dealer not being able to do this. I don't think he was ever able to get his car running.