The fuel level sensor is an important input to the control module for the enhanced evaporative system diagnostic. The fuel level information is needed for the ECM to know the volume of the fuel tank. The fuel level affects the rate of change in the air pressure in the EVAP system. The resistance across the sensor changes with the fuel level, varying the voltage drop across it. The ECM sets this DTC when the signal being received is higher than expected.

DTC P0463 will set when the signal from the fuel level sensor exceed 4.5 volts when:

Condition exists for longer than 1 second

P0463 is a (type D) DTC.

To locate an intermittent problem, use the scan tool to monitor fuel level voltage with engine Off, ignition On.

Wiggling wires while monitoring fuel level voltage may locate where a short to ground exists.