I'm familiar with it. It covers aftermarket mods.
You can't tinker with software settings and other non-maintenance service items.
GM just went thru with this on people monkeying with their corvettes. They got tired of paying for blown engines. So if tampering is detected, they blacklist you in their dealer system.
They can stonewall you all they like. Winning a case is really expensive and they know it.
If they tell you they'll void you if you change the BMS software, they mean it. You really think you are going to sue over a $5,000 part? Who's going to take that case unless they get paid by the hour. My lawyer is around $500 an hour for office, double that for court.
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