Gasoline Level Shown
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 IPC illuminates the GASOLINE LEVEL SHOWN message in the DIC when the PCM detects that the fuel gage selector switch is pressed while the vehicle is operating on CNG. The IPC receives a class 2 message from the PCM requesting illumination.