The powertrain control module (PCM) monitors the resistance of the fuel level sensor, or tank sender, to calculate the amount of fuel in the tank and provides a voltage to the tank sender through a resistor network and a return to PCM ground.

DTC P0461 will set if the fuel level changes by less than 2 percent while driving 30 miles.

Using a scan tool, monitor the fuel level voltage while rocking the vehicle back and forth. The voltage will fluctuate in a normal operating system.

Possible Causes