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Hi All, thank you very much for your replies! It is indeed a PTU failure. Went to a local dealer, told him to check PTU. Found the same problem many people had, leaking fluid. I started to have a wired smell back in May. Told the dealer during oil change the smell problem. He said everything was fine. I should turn AC to internal so i don't get any smell. Last week it came to a point that the dealer (a different one) told me it got really close to break down on the road. He gave me a loaner car to drive for 4 days including a weekend. Now noise gone. To Todd, Just wondering why not issuing a recall since so many known problems with PTU. It is really embarrassing to drive a 2013 nice looking car with that noise. It made a very bad brand image for Ford. Friends will laugh to know a car with 40k making that kind of noise. It is also dangerous. Dealer told me gears could fly out of the PTU if on the highway. In addition to PTU, I had another problem with this car. A wired rattling noise from B pillar. exactly the same with this post http://www.fordedgeforum.com/topic/17808-ive-got-a-rattle/. It is the rear pushpin for that plastic cover underneath. I went to a dealer 3 times and checked both doors on drivers' side. could not solve the problem. Went to another dealer to have a 2nd eye. Still could not find where it came from. Could you please, after seeing this post, issue a TSB at least, to notify your dealers of this known problem? This is really another embarrassing noise, kill the brand image instantly, make the car feel so cheap, even though it is a AWD SEL model. I took so much time from my work to get the car fixed. Got so confused every time they told me they could not find the problem. I had to leave with it. It is a 13 model with less than 50k miles. This is my first time buying a Ford. Not a pleasant experience. Had high expectations.

thank you! it solved my rattling problem on 2013 Edge SEL AWD. Went to dealer A 3 times, check both doors on drivers' side; dealer B once. The noise was driving me crazy! although it look different from underneath with 2015 model, it is the same rear pushpin for the plastic cover! started to have the problem at about 40k. Now 50k, finally solve it by myself! Thank you!

this has been going on for some time now. Started out of nowhere. 2013 Edge SEL AWD, with 49,000 miles, 3.5 L engine. The high pitch engine noisecan be heard at low speed, 40-50 mph. Very loud, like a plane taking off, at higher speed, 70-80 mph. It is constant no matter whether I push the gas or not. But it is louder when foot is off the gas. Here is link to the sound: https://www.youtube.com/embed/FytNmN5IYQw?html5=1&fs=1 Please let me know if you know what might be wrong. Car drives great. No vibration or anything. Used to be a very quiet ride. But this noise is annoying! Maintenance on schedule every time. Thanks!

this has been going on for some time now. Started out of nowhere. 2013 Edge SEL AWD, with 49,000 miles, 3.5 L engine. The high pitch engine noise can be heard at low speed, 40-50 mph. Very loud, like a plane taking off, at higher speed, 70-80 mph. It is constant no matter whether I push the gas or not. But it is louder when foot is off the gas. Here is link to the sound: https://www.youtube.com/watch?v=FytNmN5IYQw Please let me know if you know what might be wrong. Car drives great. No vibration or anything. Used to be a very quiet ride. But this noise is annoying! Maintenance on schedule every time. Thanks!