CTS V6-3.2L VIN N (2003)
Fuel Gauge: Description and Operation
FUEL GAGE
The ECM sends fuel level percent to the 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%, the low fuel indicator illuminates. Refer to Evaporative Emission (EVAP) Control System Description in Computers
and Control Systems for more information.