1998 GMC Sonoma Owner's Manual - Page 75

If the engine stalls and the SECURITY light flashes, wait about 10 minutes until the light stops flashing before trying to restart the engine. Remember to release the key from the START position as soon as the engine starts. If the engine does not start after three(3) tries, the vehicle needs service. New Vehicle "Break-In" NOTICE: Your vehicle doesn't needan elaborate "break-in." But it will perform better in the long run if you follow these guidelines: 0 Keep your speed at mph (88 km/h) or 55 less for the first miles (805 km). 500 0 Don't drive at any one speed fast or 500 slow for the first miles (805 km). Don't make full-throttle starts. 0 Avoid making hard stops for the first 200 miles (322 km) orso. During this time your new brake linings aren't yet broken in. Hard stops withnew linings can mean premature wear and earlier replacement. Follow this breaking-in guideline every time you get new brake linings. 0 Don't tow a trailer during break-in.See "Towing a Trailer'' in the Index for more information. If you are driving and the SECURITY light comes on, you will be able to restart the engine if you turn the engine off. However, your Passlock system is not working properly and must be serviced by your dealer. Your vehicle is not protected by Passlock atthis time. You may also want to check the fuse (see"Fuses and Circuit Breakers" in the Index). Seeyour dealer for service. -- -- If the SECURITY light flashes, wait until the light stops flashing before starting engine. the If the SECURITY light comes on while the engine is running, a problem has been detected and the system may need service. Seeyour dealer for service. In an emergency, call the GM Roadside Assistance Center. See "Roadside Assistance" in the Index. 2-11