Fuel Gauge: Description and Operation

FUEL GAGE

The instrument panel cluster (IPC) displays the fuel level as determined by the powertrain control module (PCM)/engine control module (ECM). The IPC receives a GMLAN message from the body control module (BCM) indicating the fuel level volume. The fuel gage defaults to empty (E) if:
- The PCM/ECM detects a malfunction in the fuel level sensor circuit.
- The IPC detects a loss of GMLAN communications with the BCM.

When the fuel level is less than a certain low percentage, LOW FUEL message displays in the driver information center (DIC).