Engine Oil Low
WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The instrument panel cluster (IPC) illuminates the ENGINE OIL LOW message in the driver information center (DIC) when the engine control module (ECM) detects a low engine oil level condition. The ECM only monitors the oil level switch signal circuit for a brief period between key on and ignition crank. The IPC receives a class 2 message from the ECM requesting illumination.