Low Oil Level
WARNING: This page is about a different car, the 2003 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
The IPC illuminates the LOW OIL LEVEL indicator in the message center when the powertrain control module (PCM) detects low engine oil level, and the signal circuit is low. The IPC receives a class 2 message requesting illumination from the PCM.