Cruise Control Inhibited
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.
The cruise control module assembly contains a low speed limit which will prevent system engagement below a minimum speed of 40 km/h (25 mph).
The cruise control will not engage if the cruise control module detects a low voltage signal on the CHMSL supply voltage/stop lamp supply voltage circuit when the brake pedal is depressed.