2008 Chevrolet Uplander Owner's Manual - Page 205

This light comes on, as a check to show it is working, when the ignition is turned ON/RUN but the engine is not running. If the light does not come on, have it repaired. This light also comes on during a malfunction in one of two ways: If the Light is Flashing The following can prevent more serious damage to your vehicle: • Light Flashing - A misfire condition has been detected. A misfire increases vehicle emissions and could damage the emission control system on your vehicle. Diagnosis and service might be required. Reduce vehicle speed. Avoid hard accelerations. Avoid steep uphill grades. If you are towing a trailer, reduce the amount of cargo being hauled as soon as it is possible. • Light On Steady - An emission control system malfunction has been detected on your vehicle. Diagnosis and service might be required. 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. Find a safe place to park the vehicle. Turn the ignition off, wait at least 10 seconds, and restart the engine. If the light remains on steady, see "If the Light Is On Steady" following. If the light is still flashing, follow the previous steps and see your dealer/retailer for service as soon as possible. 3-45