Fuel Gage

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The instrument panel cluster (IPC) displays the fuel level as determined by the ECM. The IPC receives a GMLAN message from the ECM indicating the fuel level percent. The fuel gage defaults to empty if:

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

When the fuel level is less than a pre-determined value, the low fuel indicator illuminates in the IPC.