2002 GMC Envoy Owner's Manual - Page 74

This vehicle has one double-sided key for the ignition and door locks. It will fit with either side up. NOTICE: Your vehicle has a number of new features that can help prevent theft. But you can have a lot of trouble getting into your vehicle if you ever lock your key inside. You may even have to damage your vehicle to get in. So be sure you have an extra key. If you ever do get locked out of your vehicle, call the GM Roadside Assistance Center. See "Roadside Assistance" in the Index. When a new vehicle is delivered, the dealer provides the owner with a pair of identical keys and a key code number. 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 new ones made easily using this number. Your selling dealer should also have this number. 2-5