One problem related to transmission not go into gear has been reported for the 2011 Ford Flex. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2011 Ford Flex based on all problems reported for the 2011 Flex.
It has happened since 2012 sept, when I bought it at 4000km. I was about to start from a traffic light. I let go my brake and 'slightly' onto gas. "nothing at all happened. " I push a bit harder and it crank into another gear as I felt like 'galloping'. I brought it to the body shop I knew (8 pm) and was told to go to dealers for transmittion check up. Did so, in 3 days - 'no code' no problem. It happened in November 2012; trying to catch up with traffic on 401 highway - March 2013, moving slowly in scity street - June and oct 2013; from stop - April 2014, June 2015 and about to stop before traffice light - may 2016. I brought it into 2 different delears, 3 private bodyshops. Dealers found nothing - 'no code'; private body shop - water/ air trapped in gas/ fuel line; bad transmission etc. Contacted Ford customer sevices - told to contact local delears, record on file. No solution still. This is Ford!!!! once get the chance - go anything other than Ford!!.