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If you have another Ford dealer available I'd try them. I recently bought a second 2016 C-Max Energi with 59k miles and it has a low roar/howl under load my first 16 with the same miles does not. The dealer I use has a Shop Foreman who has a 2017 C-Max as his personal vehicle. We drove the car and he diagnosed it as the pinion in the final drive going bad - the dealer is replacing the transmission. The Energi has an 8/100k warranty on the powertrain including the transmission (in CARB states like California it's 10/150k) so don't accept one opinion. The C-Max should be very quiet if it's right. Good luck.