Beginning with the 2007 model year, Chevy trucks and SUVs began using a new family of remotes with FCC ID OUC60270. The 3-button keyfob in this family was used on all Chevrolet Silverado pickup trucks from 2007 through 2010 except those equipped with remote start.
See this 3-button remote at this link.
Systems that use this remote may or may not be user programmable. It depends on the keyless entry system management options that appear in the menu of the driver information center or odometer on each vehicle.