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EDIT: Just goes to show you can't assume; I saw a post mentioning checking transmission fluid on a 2012 with no dipstick. A lot of what I said for checking the fluid will not apply... sorry.
How ironic this is the first time I've logged in... in a long time, and I just battled a similar issue.
Disclaimer: I'm not a mechanic, but I'm just sharing my experience.
Cliffs notes first: Service manual says to start the car on a level surface, and ensure that the fluid when cold is just on the tip of the dipstick. IF it's not even present on the end of the stick, shut it down, and slowly add until it's there. If the fluid is present, warm the car up, then drive on local roads ~3miles. I cycled the gears before doing that, then drove through my neighborhood for around 2 miles. When I go home, I checked the temperature of the transmission fluid with my scanner to ensure it was within SVC manual spec (if I have the manual in my trunk, I'll go out on lunch and get specific numbers). At this point, the fluid was ~150*F. Added little by little cycling through P, R, N, D slowly to allow fluid to move around. When I got to a suitable level on the dipstick, the fluid was ~170*F, and I took it out for another drive. Nice and easy. PM me if you want and I'll scan and send over the service manual pages tomorrow at work.
Word of advice: Be careful adding transmission fluid while the car is driving, and make sure the funnel is nice and tight. I have no idea why, but the fluid likes to be added slow, as it sometimes wants to burp and bubble up as I'm adding it. Maybe someone smarter than me can explain why, admittedly I have no clue. The aforementioned was done on a 2009 car, and I am unaware of any design changes that may impact your model.
Side bar if you care:
My wife was complaining about how her car was driving, so I opened hood and noticed copious amounts of trans fluid. I told her she's not driving it anymore and take my car. I tore into it, and found that the cooler line was rusted in a fairly nondescript place, but beyond that, nothing stood out, but there was a LOT of fluid underneath. I wiped everything down real good, dried all I could, and waited with the car off. I noticed a VERY SMALL (smaller than a pinhead) area where fluid was "sweating" out of the line, so to speak. Even though the line just looked like crap, it seemed to be fine. Nope. Especially under a bit of pressure, it would rocket everything out. Finding a part number for the stock cooler lines was impossible, local dealer wanted 170 for them and wouldn't be able to get until Thanksgiving, hopefully. Bought 25ft of Derale transmission rated 3/8 hose, reused the spring clamps, and ran my own cooler lines for <$30. Have put 150 miles on the car since the weekend driving to and from work, and knock on wood all is well (Save for a loose trans drain pan plug that I had to tend to last night). I strongly suggest you confirm where the leak is first before tearing into anything. I used to clean everything up and throw a bit of talcum powder in the suspect areas on an old truck I had. Crude but worked.
Good luck, it's not that bad to do the work, and frankly tracking down the spot of the leak was the most time consuming part of this endeavor.
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