Oil Pressure Low
WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
The driver information center (DIC) displays OIL PRESSURE LOW STOP ENGINE message when the engine control module (ECM) detects a low engine oil pressure condition from the engine oil pressure (EOP) sensor/switch. The instrument panel cluster (IPC) receives a GMLAN serial data message from the ECM requesting display of the low oil pressure message.