CTS V6-2.8L (2006)
Fuel Gauge: Description and Operation
FUEL GAGE
The engine control module (ECM) sends fuel level percent to the instrument panel cluster (IPC) via class 2. The IPC displays the fuel level as
determined by the ECM. The IPC receives a class 2 message from the ECM indicating the fuel level percent. The fuel gage defaults to E (empty) if:
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The ECM detects a malfunction in the fuel level sensor circuit.
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The IPC detects a loss of class 2 communications with the ECM.
When the fuel level is less than 4 percent, the low fuel indicator illuminates. For more information about the fuel system, refer to the following:
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Fuel System Description for the 2.8L engine
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Fuel System Description for the 3.6L (LY7) engine
