Change Oil Soon

The change oil soon telltale is turned ON by the cluster when it receives a command from the powertrain control module (PCM) (L61) engine or the body control module (BCM) (L81) engine. The engine control module (ECM) (L81) sends a message to the BCM over the CAN serial data link. The change oil soon telltale is commanded On based on a calculated value of time and mileage. This indicates to the operator of the vehicle that the oil should be changed as soon as possible.

The change oil soon telltale is turned ON by the cluster for 2-3 seconds, when the ignition is turned to RUN, for a visual system check.