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). A replaceable PROM chip also meant the PCM could be “retuned” if necessary to correct certain kinds of emissions or driveability problems. GM pioneered the replaceable PROM chip as a way of programming PCMs to fit a wide range of GM makes and models. Previously, Program Read Only Memory (PROM) chips held all of the PCMs vital calibration information and operating instructions. The first such application was the 1990 Geo Storm. How to: American vehicles (GM Ford Chrysler) PCM flash reprogramming tutorial in detail for newbies.įlash reprogrammable PCMs have been ussed in vehicles since the 1990s.
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