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It's definitely not the sound you're describing. It's coming from the engine and is now present when the vehicle is in neutral but I apply the gas pedal. I've taken the car to a second party transmission mechanic to verify that it is the transmission. Outlook is not too good, so I will probably be hitting up Ford soon enough. Argh. Thanks, all.

Yeah, I've read that thread too but it's definitely engine related. When I first boot it up--especially after it has been off for a few hours--there is a definite whining sound if I accelerate while the car is in park or neutral. Just not any grinding (or noise of any kind) when shifting from park to reverse or drive.

Unfortunately my mileage is at 103k right now. Probably not under any sort of warranty. I'll do some research on those other threads. Thanks! Edit: Reading over the linked thread, it seems you have had transmission failure symptoms that I would normally expect, such as grinding gears. I'm just not having that, which is making me question if it's a transmission issue at all.

Hi, I'm having an issue with my 2013 C-Max. It seems to make a "whooshing" noise when I get up to about 35MPH and gets progressively louder the faster I go. I've taken it in to my local Ford dealership and their diagnostic said that the transmissions is at fault and will need to be replaced. However, they did not examine the transmission fluid or any of the other usual transmission checks. Moreover, the car is not stuttering when I accelerate, there is no grinding noise, none of the stuff that I think is usually related to transmission issues. The quote my dealership gave to repair/replace the transmission was around $7,000, and I'm definitely not going to spend that on a car that's less than five years old. Has anyone else experienced these issues or something like them? Really looking for any insight or ray of hope that I'm not driving something that's about to die. Thanks!

I've had it enabled at 70mph, and was getting around 35-45 MPG. I've never had it turn off based on speed.