Power Control Module on 2004 GMC Envoy

I finaly got an answer to my check engine light and a few things poped up. Does a PCM replacement really cost $1000? I did some research on the web and some said it is easy to repalced, but need to be reprogramed once in. is this true?

Asked by for the 2004 GMC Envoy
Who did the Check Engine Light Diagnosis and what were the specific codes?