obd2motor GM Tech 2 scan tool how to get the GM Trouble Code

OBD2MOTOR GM Tech 2 can read backlit screen,capture stored DTCs, Freeze Frame, Failure Record for later review,which support on-board diagnostics for all latest GM vehicles from 1992 to 2012 year.
   GM trouble codes may be retrieved with or without a code scanner on pre-1993 GM vehicles, due to the type of OBD port connector of Vetronix GM Tech2 . This port has been changed in the later model vehicles, and GM Tech 2 scanner is necessary to retrieve the codes.
   
   Once the codes have been retrieved