Fuel Gauge

WARNING: This page is about a different car, the 2011 Cadillac DTS. 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). The IPC receives a serial data message from the ECM indicating the fuel level percent. The fuel gauge defaults to empty if:

The ECM detects a malfunction in the fuel level sensor circuit.
The IPC detects a loss of serial data communications with the ECM.

When the fuel level is less than a pre-determined value, the low fuel message displays in the DIC.