Believe what you want, but they can. I have watched it with my own eyes be entered into the system. I promise you a dealer can. They can do it, then go to another dealer 5 min later and it will come up in the system warranty voided. GM doesn't not have the time to deal with every warranty related issue for every dealer every minute of the day in the country. They give the dealer the latitude to do it. The dealer is suppose to be the honest broker, so GM is not paying for work done that they should not have to pay for. Now if the dealer outright voids it, it will usually get reviewed quickly, if they put the warranty on hold, then it can take weeks for GM to make a decision. A customer can complain to GM and if GM wants they can send a field rep out and see if it's legit. Remember it is always about money not only for the dealer but also GM. GM has extremely high priced lawyers to deal with stuff so if the customer takes the complaint far enough they are ready to go. The small shop I work with was once pulled into court for the plantiffs side, and I watched the lawyers chew up everything, even the Magnuson-Moss act when it was brought up. Needless to say the plantiff lost after six months, a lot of money, and warranty still voided. Now you posted the following in a previous post which I find interesting. Why would federal law say dealer can't void warranty except for two exceptions, if the dealer can't void a warranty no matter what, like you say. (Federal law precludes a dealer from voiding warranty just because of using aftermarket speed equipment, with only two exceptions: the warranty can be voided if the aftermarket part causes damage, or adversely affects the emissions or the emissions system. SEMA (Specialty Equipment Market Association) reported that a trade association representing specialty automotive parts manufacturers, the following quotes have been extracted:) Sent from my SM-G975U1 using Tapatalk