Yes! Give the door a few bangs carefully whilst operating the remote for opening and closing,If it opens follow bellow but remember not to re-rock the car - if it's doesn't it's a lot more high risk, although quite often it does open.
First move get it scanned with VCDS, it will show the fault - test it in output testes for the module number in question.
99% of the time it's the door lock module - cheapest place to get one I found is here
http://www.ebay.co.uk/itm/231105716598?_trksid=p2059210.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AITHe's £110 cheaper than the dealer and the item is new!
You will have to check the part number for a rear module off his shop!
The job at first seems difficult but it you give yourself a chance - take a few photos etc it's pretty simple really!
The trick is to remember to follow the guide above and not loose the T20 for the handle to far.