Check Eng Oil Pressure
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 CHECK ENG OIL PRESSURE message in the driver information center (DIC) when the powertrain control module (PCM) detects a low engine oil pressure condition. The IPC receives a class 2 message from the PCM requesting illumination.