I have a Corsa c 1.2 semi-auto and its flashing 'F'???? ?

it is a Corsa club semi auto and has a flashing F i can start the car but it will not select any gear??? I have asked a mobile mechanic to come out a put it on a fault finder.he said he thinks it will be somthing to do with the trip tronics?? and quoted me £900 to £1000 without looking, i said i wanted the test and He has yet to appear. has any one got any ideas?