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I don't doubt it. I own a '17 Silverado Diesel and it was hell for the tuners to get the ECM cracked and not sure they ever really did it. When it first came out it was essentially $4K to tune your truck which included you buying a new ECM.
In the forums there was a Cyber Wizard who claimed people would never get it cracked but I'm not sure GM implemented all the protections he thought they would do. Long and short of it they can essentially lock anybody out of it forever if they really wanted to. Really all they have to do is get the vehicle to do constant checks module against module and if the codes don't match then the modules shut down. A clearing house can be setup to update the modules say via Onstar. The only limits is how this effects servicing and if it is too much of a pain or too costly to say dealers then they might not go that far.
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