GM used keyless entry system remote transmitters with an FCC ID of KOBUT1BT on many vehicles from 1996 through 2001. For instance, the new-style Chevy Silverado and GMC Sierra pickup trucks used this remote from their introduction in the 1999 model year through 2000 and even into the 2001 model year. 2001 was a split year with respect to the factory keyless entry system used on the new-style GM trucks, though, so take care to identify the correct part if you are buying a replacement remote for a 2001 GM truck. Many sedans also used remotes with FCC ID KOBUT1BT as early as the 1996 model year.
The keyfobs had a variety of button configurations, depending on whether or not the remote operated a rear function and on what that function was. Also, some of the vehicles had seat memory systems, so some of the cases show a large number “1″ or “2″ on the back of the case.
Some of the keyless entry systems that used a KOBUT1BT keyfob are user programmable and others require dealership programming. In general, all of the truck platform vehicles that originally used a 3-button version of this remote are user programmable, while the programming situation for sedans that used a 4-button version vary depending on the make and model year. If you are not sure whether or not your vehicle requires a scan tool for programming, you can search the Remotes Unlimited website by the make, model and year of your vehicle and read the programming note that is displayed.