The Fuel Level Sensor (FLS) is a sensor that is usually located on top of the fuel tank or in the fuel pump module. This sensor converts the fuel level into an electrical signal, which it sends to the Powertrain Control Module (PCM). This signal is received by the Powertrain Control Module to determine the amount of fuel available in the fuel tank. This way, it monitors usage and determines fuel savings.
The configuration of the DTC code P0460 OBDII is because the input is not within the parameters of normal operating voltages, which are stored in the memory of the PCM.