Fuel Level Sensor: Description and Operation

FUEL LEVEL SENSOR

The fuel level sensor consists of a float, a wire float arm, and a ceramic resistor card. The position of the float arm indicates the fuel level. The fuel level sensor contains a variable resistor which changes resistance in correspondence with the position of the float arm. The powertrain control module (PCM) sends the fuel level information via the GMLAN serial data circuit to the body control module (BCM). The BCM sends the GMLAN message to the instrument panel cluster (IPC). This information is used for the IPC fuel gage and the low fuel warning indicator, if applicable. The PCM also monitors the fuel level input for various diagnostics.