what to do when transmiission will nto shift into high gear on 2007 Ford Fusion

Just started occuring yesterday.

Asked by for the 2007 Ford Fusion
need to have it scanned for codes. should have set a code or codes. let us know.
it is in ashop having that done now
1 more answer
check the trans oil?
theres a valve on the trans that helps it shift you need someone to check it out. thats what I did.