1996 GMC Suburban Owner's Manual - Page 128

If the Light Is Flashing The following may prevent more serious damage to your vehicle: Reduce vehicle speed. 0 If the Light Is On Steady You may be able to correct the emission system malfunction by considering the following: Did you just put fuel into your vehicle? Avoid hard accelerations. Avoid steep uphill grades. If towing a trailer, reduce the amount of cargo being hauled as soon as it is possible. If so, reinstall the fuel cap, making sure to fully install the cap. The diagnostic system can determine if the fuel cap has been left off or improperly installed. This will allow fuel to evaporate into the atmosphere. A few driving trips should turn the light off. Did you -justdrive through a deep puddle of water? If so, your electrical system may be wet. The condition will usually be corrected when the electrical system dries out. A few driving trips should turn the light off. Are you low on fuel? As your engine starts to run out of fuel, your engine may not run as efficiently as designed since small amounts of air are sucked into the fuel line causing a misfire. The system can detect this. Adding fuel should correct this condition. Make sure to install the fuel cap properly. It will take a few driving trips to turn the light off. If the light stops flashing and remains on steady, see "If the Light Is On Steady" following. If the light continues to flash, when it is safe to do so, stop the vehicle. Put your vehicle in PARK (P). Turn the key off, wait at least 10 seconds and restart the engine. I f the light remains on steady, see "If the Light Is On Steady" following.If the light is still flashing follow the previous steps, and drive the vehicle to your dealer or qualified service center for service. 2-64