transmission

#1
the transmission on my 93 imperial locked up
i returned from a month long trip and turned into my driveway
the transmission shifted down to first and locked
the windows on my shift control showed a number 1 it one window and the other window was blank
i disconected the battery and reconnected it and the control looked normal i started the coach and drove 50 feet to my garage and tried to back beside it and it loocked again
when it locks the dash say do not shift
please help thanks dave
 
Top