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Originally Posted by CamaroSpike23
thats just it. they have a pretty good idea. but they dont know all the ins and outs of this computer. some claim to, but they dont. there are systems and subsystems in this computer that the tuners cant access (regardless of what they might let you believe). they want you to think that you can sneak by GM with a tune. just because the dealer tech couldnt find the tune, doesnt mean that the GM engineer who reviews the pcm wont.
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It's just a drive train computer, not some super secret module that holds the access codes to the long range nuclear missiles. Programs can be accessed and subsystems can be accessed, despite what the "GM programmers" told you. If they can access it, I can guarantee you that others can. Despite that, it really doesn't matter if you can access those subsystems anyway. All they're doing is tweaking the stock tune and putting it back in. It's not like they are rewriting a brand new engine management program, although i'm sure many of them could do just that.
It all comes down to whether or not GM can tell if you've swapped a "cooked" tune in and then reverted back to OEM. If they don't have a WORKING counter to tell if it's been swapped, then they can't. Do you have proof that the GM engineer can figure it out? How many of these "GM engineers" are out there? They're gonna have to have a shit load of them to go all around the country checking ECUs. I think you either give them too much credit or the private sector too little. If you ghost the stock tune out, then put it back in, it's EXACTLY the way it was when it was taken out and will match all the CVN codes perfectly. If you go by the bulletin that GM put out, as long as the CVN codes match, it's OEM.
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Although the part numbers will be the same for each, it's the CVN that will determine if the calibration is GM issued. If ALL of the CVN's are EXACTLY the same, the calibration is GM issued.
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