Ellery Quiles

My 2007 Uplander was driving fine one day, the next morning I go to drive off and it wouldn't go into gear. Reverse still works but it won't drive forward. I've heard it might be a solenoid which wouldn't make it an incredibly expensive fix, but i need to make sure before i invest. Has anyone encountered this problem and has found a solution? If so please help, i would so greatly appreciate it.