Low Oil Pressure
WARNING: This page is about a different car, the 2004 Pontiac Sunfire and 2004 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
The IPC illuminates the engine oil pressure indicator when the powertrain control module (PCM) detects low engine oil pressure, and the signal circuit is low. The IPC receives a class 2 message originating from the PCM via the BCM requesting illumination.