Water In Fuel
WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The IPC illuminates the WATER IN FUEL message in the driver information center (DIC) when the water in fuel sensor detects water in the fuel system. The water in fuel sensor signal is low.