Fuel Gage

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 BCM sends the fuel level information from the ECM to the IPC via a serial data message 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.
• The IPC detects a loss of GMLAN communications with the BCM.

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