Conditions for Setting the DTC

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.

Hood position condition met indicates that the hood position, as read by the HCM, meets the HCM requirements for entry into engine auto stop, hood closed.
Hood switch voltage less than 0.05 volts.
HCM run time greater than 5 seconds.