The price on my wife's Montego was ~$84 after taxes. There are several TSBs for the '05 and early '06 Montego/500/Freestyle with a PCM update as the solution. The TSB issues include hard shifts on the six-speed auto, RPM wandering while cruising on the CVT, headlight flicker, hard start/extended crank in cold weather (our issue), and bad breath (j/k). We did see a minor improvement in fuel efficiency after the update.
Originally Posted by OTRtech
it's just a matter of time before they figure how to write their own complete code for engine management.
But will they run Windows, Mac, or Linux on the vehicles?
Seriously though, you can get scan gauges that run from a laptop now. They are only capturing data, though, not setting shift points, etc.
Originally Posted by fabioonachopper
i have a 02 that i know never had this done. should it be something that i look into?
You will have to see if there are any TSB's on '02s where updating the PCM is a solution. If not, you may still want to consider it, as there might be fuel efficiency (my experience) or power gains (OP's experience) from the engineers refining the logic.