Originally Posted by
Jon S.
As with all things, there is a "best" course of action. Full reprogramming any controller with a different OS is best done using GM tools. As an example, HP Tuners can fully reprogram the P01 and P59 PCM with a different OS. However, the nice folks at HP Tuners have consistently advised against this action.
As far as hauling it to a dealership - that was not my thinking. Many dealership wouldn't touch it anyway.
Any decent tuner or tuning facility should have GM hardware (Tech 2 / MDI / Mongoose / etc). Since it often seems like there is a tuner on every street corner these days, my hope was that this fellow may have a local resource to assist him.