Low Oil
WARNING: This page is about a different car, the 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, 2003 Chevrolet Monte Carlo, and 2003 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
The Instrument Panel Cluster (IPC) illuminates the LOW OIL message when the Powertrain Control Module (PCM) detects low engine oil level, and the signal circuit is high. The PCM only monitors the signal circuit of the engine oil level switch for a brief period when the key moves from RUN to START position. The IPC receives a class 2 message requesting illumination from the Powertrain Control Module (PCM).