key - fob program

[jpwheels]

We have only one key/fob for 2004 GTO, I purchased a replacement key/fob, I can get the key cut at a locksmith, but how do I program the fob? dealer wants 75$ just to look up the security codes and 75 to program. Is there a manual method

[Cutlass]

Programming Transmitters Without Scan Tool

1. Turn the ignition to ON, then wait 10 minutes for the next step in the programming sequence.
2. After the 10 minutes has elapsed, the car horn will chirp once. Turn the ignition switch to the OFF position within 5 minutes after the horn has sounded, then to the ON position within 5 seconds after switching it OFF.
3. Leave the key to the ON position for 10 minutes. After the 10 minutes has elapsed, the car horn will chirp twice. Turn the ignition switch to the OFF position within 5 minutes after the horn has sounded, then to the ON position within 5 seconds after switching it OFF.
4. Leave the key to the ON position for 10 minutes. After the 10 minutes has elapsed, the car horn will chirp 3 times.
5. Verify that the security indicator in the instrument cluster has stopped flashing and attempt to start the vehicle.
6. Turn the ignition to OFF and remove the key from the ignition switch.
7. Move approximately 3 meters (10 ft) away from the vehicle and test the transmitter functions to validate that the transmitter has been programmed successfully.