Fuel Gage
WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. 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 engine control module (ECM)/powertrain control module (PCM). The IPC receives a class 2 message from the ECM/PCM indicating the fuel level percent. The fuel gage defaults to E (empty) if the ECM/PCM detects a malfunction in the fuel level sensor circuit. Refer to Fuel System Description in Engine Controls.
When the fuel level is less than 11 percent (less than 1/16 tank) of a tank of gas, the LOW FUEL message illuminates in the message center.