1997 GMC Sonoma Owner's Manual - Page 51

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