P0462 indicates the engine control module is detecting a voltage signal from the fuel level sensor that is lower than the calibrated range, typically caused by a short to ground in the wiring or a failed sensor sending an erroneously low voltage input. This code specifically refers to the electrical circuit condition rather than fuel system pressure or volume.
The resistive strip or float arm inside the fuel tank has worn out, broken, or internally shorted, causing it to send a voltage near zero regardless of actual fuel level. This is the most common failure point for this circuit.
The signal wire between the fuel tank and the powertrain control module has rubbed through its insulation and is contacting the vehicle frame, exhaust, or another ground source, pulling the circuit voltage low.
Moisture intrusion at the fuel tank harness connector, pass-through grommet, or body harness junction has created excessive resistance or a partial short to ground on the signal circuit.
The ground return path for the fuel level sensor is broken, disconnected, or corroded, causing the reference voltage to pull low and set the circuit low code.
The cluster's internal circuitry may misinterpret the sensor signal, though this typically affects display only and does not usually trigger a circuit-specific diagnostic trouble code.
The module's analog-to-digital converter or specific input circuit has failed; this should only be considered after verifying perfect wiring and sensor integrity, as PCM failure is statistically unlikely for this code.
Yes, but you will not have an accurate fuel level indication. Track your mileage manually since the last fill-up to avoid running out of fuel, as the gauge may read empty regardless of tank contents.
Often yes, because many vehicles integrate the fuel level sensor with the pump assembly. Some designs allow separate sensor replacement, but accessing the tank is required either way.
Almost never. P0462 is caused by the sensor or wiring in nearly all cases. PCM replacement is rarely the solution and should only be considered after exhaustive testing proves the module is not receiving the correct signal despite verified good wiring and sensor operation.
The sensor is likely internally shorted or the signal wire is grounded to the chassis, causing the system to interpret the signal as empty. Alternatively, the float arm may have detached or broken off inside the tank.