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That program ended December 31, 2017. I see now it only ends on that date if the 5 years from the warranty start date has already elapsed. Unfortunately, a MY2015 C-Max may already have hit that 5 year mark. Definitely worth checking though! This has nothing to do with Sync2/MFT. It's the modem (which is what makes MyFordMobile work). From 2013 until later in the 2016 model year, Ford was putting in modems that used AT&T's 2G cellular network. Which is crazy because AT&T dismantled that network January 1 2017 (and announced its plans to do so 4 years prior). There is most likely nothing malfunctioning with your modem--but the cellular service it needs to operate doesn't exist any longer. So the car can't communicate with the MyFordMobile servers. The only solution is to get a 3G modem installed at a Ford dealership. Sucks, since Ford should not have been installing 2G modems in any C-Max, and certainly shouldn't have been by the 2015 model year. You can try to fight them to cover it, but I don't recall reading any reports from folks who had success doing that.