Fuel level sensor signal wire chafed or shorted to ground between the sensor and the computer; Fuel level sensor float stuck at the bottom of its travel or saturated and sinking in the fuel; Failed fuel level sensor sending unit with worn resistance tracks reading near zero ohms; Corroded or pushed-back terminal in the fuel pump module connector allowing the signal to pull low; Water or contamination in the fuel tank causing the sensor resistor card to short; Damaged fuel pump module assembly where the sensor wiper arm has come off its pivot; Rarely, an internal fault in the engine computer or body control module that processes the level signal

DTC codes / P04xx · Auxiliary emission controls / P0462

P0462Fuel Level Sensor Circuit Low Input

Q: What does code P0462 mean?

Fuel Level Sensor Circuit Low Input. P0462 means the engine computer has seen the fuel level sensor signal wire voltage stay lower than the expected range for a calibrated amount of time, so it cannot trust the dash gauge reading. The sensor itself is usually a float on a pivoting arm inside the tank that varies a resistance to ground, and a low input tells the computer the signal circuit is shorted to ground or the sensor resistance has dropped out of range.

P0462 means the engine computer has seen the fuel level sensor signal wire voltage stay lower than the expected range for a calibrated amount of time, so it cannot trust the dash gauge reading. The sensor itself is usually a float on a pivoting arm inside the tank that varies a resistance to ground, and a low input tells the computer the signal circuit is shorted to ground or the sensor resistance has dropped out of range.

SystemPowertrain

Code typeGeneric (all makes)

SeverityLow

Fix difficultyIntermediate

AreaAuxiliary emission controls

Symptoms you may notice

Fuel gauge reads empty or below empty at all times, even right after filling the tank
Low fuel warning light illuminated continuously regardless of actual fuel level
Often no symptoms besides the warning light, with the vehicle running and driving normally
Fuel gauge needle may sit at empty and never move as fuel is consumed
On some vehicles a remote start or fuel economy display that relies on level data stops working
No drivability complaint in most cases because fuel delivery is not controlled by this sensor

Common causes, most likely first

Fuel level sensor signal wire chafed or shorted to ground between the sensor and the computer
Fuel level sensor float stuck at the bottom of its travel or saturated and sinking in the fuel
Failed fuel level sensor sending unit with worn resistance tracks reading near zero ohms
Corroded or pushed-back terminal in the fuel pump module connector allowing the signal to pull low
Water or contamination in the fuel tank causing the sensor resistor card to short
Damaged fuel pump module assembly where the sensor wiper arm has come off its pivot
Rarely, an internal fault in the engine computer or body control module that processes the level signal

How to diagnose and fix it

Connect a scan tool and read the fuel level sensor voltage and percentage in live data while watching for a steady low reading
Inspect the fuel pump module connector and harness for corrosion, chafing, or a signal wire rubbed through to ground
Disconnect the sensor and measure resistance across the sensor terminals through its full sweep to confirm it tracks smoothly
Check the signal circuit for continuity to ground with the sensor unplugged to isolate a shorted wire from a failed sensor
Verify reference voltage and ground at the sensor connector with the key on to rule out a supply-side fault
Replace the fuel level sensor or fuel pump module assembly when resistance testing proves the sender is out of range
Clear the code and confirm the gauge reads correctly through a fill and drain cycle before returning the vehicle

What a low fuel level signal really means

A fuel level sensor that reads low can be caused by a float that has absorbed fuel and sunk, which looks identical electrically to a shorted signal wire.
Many vehicles set P0462 from a body control module or instrument cluster rather than the engine computer, so the module that stores the code is not always the one that needs repair.
A chafed signal wire behind the rear seat or along the frame rail is a common miss because the connector at the tank tests fine while the harness short occurs further upstream.
After replacing a fuel pump module, some vehicles require a fuel level relearn or gauge calibration with a scan tool or the new sender will read incorrectly and reset the code.
This code does not indicate a fuel delivery problem, so chasing fuel pressure or injectors wastes time when the fault is purely in the level sensing circuit.

Can I keep driving with P0462?

The vehicle remains safe to drive because this circuit only feeds the fuel gauge and warning light, not fuel delivery or engine operation. Track your fuel purchases manually until it is repaired, because the low fuel warning may no longer alert you before the tank runs dry.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.