Diagnostic Aids
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
If the vehicle is under extreme load-such as extended idles at hot ambient or an intermittent failure with the blower system or A/C system This may cause the DTC to set if the failure has been present for more than 30 minutes on one ignition cycle.