Fuel Gauge: Description and Operation

FUEL GAGE

The instrument panel cluster (IPC) displays the fuel level as determined by the powertrain control module (PCM). The IPC receives a class 2 message from the PCM indicating the fuel level percent. The fuel gage defaults to empty if:
- The PCM detects a malfunction in the fuel level sensor circuit.
- The IPC detects a loss of class 2 communications with the PCM.

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

Reviewing the fuel system description will further explain how the system functions. Refer to:
- Fuel System Description in Computers and Control Systems - 4.3L
- Fuel System Description (Pickup and Utility) Fuel System Description (Cab Chassis) in Computers and Control Systems - 4.8L, 5.3L and 6.0L
- Fuel System Description in Computers and Control Systems - 6.6L
- Fuel System Description in Computers and Control Systems - 8.1L