First of go back and read my comments you stated it’s it a good way to do business and proceeded to say GENERALLY NO. I STATES ITS NOT EVEN GENERAL ITS DEFINITELY A BAD WAY TO DO BUSINESS HERES YOUR QUOTE Yes, it's a legit MOPAR warranty.
But, no, there is no law that says that every single FCA dealership has to accept your warranty. It's like any other business. Every dealer has the right to refuse service to anybody they want to. Is it good business to do that? Generally, no.
But, if a dealer doesn't like you, it's absolutely their prerogative to decline to accept your vehicle for work. That might be because they're mad that you bought it somewhere else. It might because they have a limited number of techs and they make more money doing work that is not being paid for by FCA. The reason doesn't matter. They don't have to accept your business if they don't want to.
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