1998 GMC Envoy Owner's Manual - Page 64

This vehicle has one double-sided key for the ignition and door locks. It will fit with either side up. The key code number tells your dealer or a qualified locksmith how to make extra keys. Keep this number in a safe place. If you lose your keys, you'll be able to have 1ew ones madeeasily using this number. Your selling iealer should also have this number. NOTICE: Your vehicle has a number of new features that a can help prevent theft. But you can have lot of trouble getting into your vehicle if you ever lock your keys inside.You may evenhave to damage your vehicle to get in. So be sure you have extra keys. When a new vehicle is delivered, the dealer provides the owner with a pair of identical keys and a key code number. 2-3