2006 GMC Yukon Owner's Manual - Page 456

1. Remove the center cap by placing the chisel end of the wheel wrench in the slot on the wheel and gently prying the cap out. If the wheel has bolt-on wheel covers, loosen the plastic nut caps by turning the wheel wrench in a counterclockwise direction. If needed, finish loosening them by hand. The nut caps will not come off. Using the flat end of the wheel wrench, pry along the edge of the cover until it comes off. 2. Use the wheel wrench to loosen all the wheel nuts. Turn the wheel wrench counterclockwise to loosen the wheel nuts. Do not remove the wheel nuts yet. 5-82