Low Oil Pressure
WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
The IPC illuminates the LOW OIL PRESSURE indicator in the message center when the ECM/PCM detects a low oil condition, the signal circuit is low. The IPC receives a class 2 message from the ECM/PCM requesting illumination.