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I killed the OnStar module in my old car by cutting a wire.

Willingness to violate manufacturer warranty is the #1 barrier. If you don't care, there isn't much to stop you from figuring it out on your own. Angle grinder will get you into anything. Just be careful with those high voltage systems in EVs...

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I think technically they would still have to honor the warranty on anything not directly effected by wire you cut, but you would probably have to fight them on it.

Just like how warranty void if removed stickers are a lie under: https://en.m.wikipedia.org/wiki/Magnuson–Moss_Warranty_Act

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