2002 Chevrolet Express Van Owner's Manual - Page 136

Malfunction Indicator Lamp (Service Engine Soon Light) (Check Engine Light) (8.1L Gasoline Engine -- Except California) This light should come on when the ignition is on, but the engine is not running, as a check to show you it is working. If it does not come on at all, have it repaired. NOTICE: If you keep driving your vehicle with this light on, after a while, your emission controls may not work as well, your fuel economy may not be as good and your engine may not run as smoothly. This could lead to costly repairs that may not be covered by your warranty. United States Canada If this light comes on or flashes while you are driving, two things may happen. First, you won't notice any difference in engine performance, but your tail pipe emissions may increase. Second, your engine may not run properly or may stall without warning. If either of these things happen, drive or tow your vehicle to your dealer for service. Reduced Engine Power The REDUCED ENGINE POWER light will come on when the cooling system temperature gets too hot and the engine further enters the engine coolant protection mode. See "Engine Overheating" in the Index for further information. 2-65