Low Oil Level
WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
The instrument panel cluster (IPC) illuminates the LOW OIL LEVEL message in the message center if the powertrain control module (PCM) detects low engine oil level. The IPC receives a class 2 message requesting illumination from the ECM/PCM.