Fuel Gage
WARNING: This page is about a different car, the 2004 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
The instrument panel cluster (IPC) displays the fuel level as determined by the powertrain control module (PCM) or the engine control module (ECM). The IPC receives a Class 2 from the PCM/ECM indicating the fuel level percent. The fuel gage defaults to empty if the PCM/ECM detects a malfunction in the fuel level sensor circuit or the IPC detects a loss of class 2 communications with the PCM/ECM.
When the fuel level is less than a pre-determined value, thirty seconds later, the low fuel driver warning message shall be displayed in the driver information center (DIC).