Performance enthusiasts also liked replaceable PROMs because the chip could be replaced with one that provided more spark advance, fuel enrichment, a higher rev limit, etc. Introduction of PCM Flash Reprogramming on GM, Ford, Chrysler Cars It also meant that if a bug was later discovered in the original factory programming, it could be corrected in the field by simply replacing the original PROM with an updated corrected PROM a tactic GM has successfully used over the years to fix many factory flaws. The first such application was the Geo Storm. Flash reprogrammable PCMs have been used in vehicles since the s. PCM flash reprogramming has become common as vehicle modules get smarter and more complex. Once that has been installed on your laptop, you can download and transfer the new PCM or other module programming to the J interface tool or scan tool. Then you have to download their interface software for your laptop so it can handle the vehicle download.
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