Lucerne V6-3.8L VIN 2 (2006)
Fuel Gauge: Description and Operation
FUEL GAGE
The instrument panel cluster (IPC) displays the fuel level as determined by the engine control module (ECM)/powertrain control module (PCM). The
IPC receives a GMLAN message from the ECM/PCM indicating the fuel level percent. The fuel gage defaults to empty if:
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The ECM/PCM detects a malfunction in the fuel level sensor circuit.
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The IPC detects a loss of GMLAN communications with the ECM/PCM.
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The IPC detects a loss of GMLAN communications with the body control module (BCM).
When the fuel level is less than a pre-determined value, the low fuel indicator illuminates in the IPC.
