Low Fuel
WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
The instrument panel cluster (IPC) displays the LOW FUEL message in the DIC when the IPC receives a serial data message from the PCM/ECM indicating a low fuel condition (if equipped with uplevel IPC UH8).