To read CVT temperatures one way is if you have an ELM327 compatible reader with Torque app and Active OBD apps (Android)

CVT Temperature Reading Confirmed for ActiveOBD

Hi all, For those of you concerned with monitoring CVT temps while towing, I have confirmed that the CVT Temperature Reading in ActiveOBD is accurate. So, for those of you who tow, if you have one of the very few specific OBD dongles that work with ActiveOBD and an Android phone, you can...

www.ascentforums.com

I don't know about Apple/IOS. edit - in the thread I linked to before they say an Autel AP200 will do it with it's proprietary app for IOS, and Active OBD has been released for IOS Active OBD for iOS released

Another option is » ScanGauge II

» CVT Fluid Temperature (Degrees Fahrenheit) – Subaru CVT

www.scangauge.com

 

I have the Bafx Wireless ODB II adaptor and it works just fine - (Works with My Chevrolet, Nissan & Subaru).
Amazon.com : Bafx Products

You can see from the link that they make one for Android & one for Apple.

I use it mainly with the TorquePro app