To find the correct engine computer for a "GM" vehicle the "service number" must be used.  This number is on the I.D. label on the computer itself.  It might be abbreviated like "service no." or "serv. no.".  You can put this number in the search bar and the computer for your vehicle should come up.  You can also search using the year and model vehicle.  Using this method you might find that several choices come up.  This is because several different service numbers may have been used for the same vehicle. 

  We will always need your VIN (17 digit vehicle identification number) so we can reprogram the computer before we ship it to you.  This number can be found at the lower left of the front windshield or on a label inside the drivers door area.  It will also be on your title or registration.  Please look for a confirming message from us that the VIN is good.  It is not uncommon that there is an error with the VIN.  Only the correct VIN can be used. 

  Your computer will be programmed with the latest program available.  Sometimes over the life of the vehicle GM makes available program updates which may improve certain driveability issues that were found.