P0460 - FUEL LEVEL SENSOR CIRCUIT MALFUNCTION
Description of DTC code P0460
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.
Symptoms of fault code P0460
- MIL light (Engine Malfunction).
- A decrease in fuel efficiency.
- The fuel level indicator reads wrongly.
- The engine may not start or stop due to a lack of fuel even when the gauge indicates that there is enough fuel.
Causes of OBD2 P0460
The fault code P0460 OBD2 is set when:
- The Fuel Level Sensor (FLS) signal circuit may be open.
- Perhaps, the signal to voltage or ground circuit of the FLS sensor is shorted.
- Possibly the FLS sensor has a mechanical failure.
- Physical damage to the fuel tank.
Possible solutions of the DTC code P0460
To correct the diagnostic code P0460 OBDII, you can do the following:
- The first thing you should do is consult the Technical service bulletins (TSB).
- Perform a visual inspection of the cables and fuses related to the fuel emitting unit. Check for disconnected, burned, or corroded cables. If so, repair or replace them.
- Disconnect the fuel level unit from the PCM and test for resistance, continuity, ground, and voltage on all circuit-related wires. Compare the results with the manufacturer's specifications. Make sure there is a good ground connection as the unit depends heavily on it.
- With the key in the ignition position and the engine off, unplug the electrical connector at the Fuel Level Sensor (FLS). Then, connect the black wire from the digital voltmeter to one terminal on the FLS sensor, and the red wire from the voltmeter to the terminal of the signal on the FLS sensor wiring harness connector. There should be between 5 and 12 volts. Compare to the specifications, if not within the specifications, there is a problem with the power or ground wire.
- Connect one cable from the DVOM (Digital Volt-Ohm Meter) to the sensor signal terminal and the other cable to the ground or reference terminal. Compare with the specifications regarding the sensor resistance. If there are zero ohms or it shows an infinite ohm reading, you must change the Fuel Level Sensor. Please, note that before replacing this sensor, you must perform the above checks, as this code is usually caused by problems in the circuitry.