Engine Oil Pressure
The engine oil pressure telltale is turned ON by the cluster when it receives a command from the powertrain control module (PCM) (L61) engine or body control module (BCM) (L81) engine. This indicates to the operator of the vehicle that the engine oil pressure has dropped below a specified limit.
The engine oil pressure telltale will come ON, for approximately 2-3 seconds at engine start-up, until the oil pressure raises enough to open the oil pressure switch, for a visual system check.