If you’ve ever lost your keys or had to replace a battery in the key FOB, this article is for you.

This works on many late model GM vehicles, although I don’t have a specific scope. I have tested it on my ’03 Chevy Truck.

1. Close all vehicle doors.
2. Put the key in the ignition (don’t turn yet)
3. Press and hold the drivers side door unlock switch
4. While holding the unlock switch in the unlock position, turn the key into the on position, then off, then on, then off.
5. Release the unlock switch. The doors will unlock and confirm the program mode
6. On one keyless remote, press and hold the lock and unlock buttons simultaneously for about 15 seconds. The doors will lock and unlock to confirm the programming of that transmitter.
7. Repeat the previous steps on any other transmitters you may have (up to four)
8. Turn the ignition key up to RUN (one click forward past the on position, but it still doesn’t engage the starter). This exits the programming mode.
9. Test the key fobs and make sure they work as expected.