Faulty fuel level sender (worn track, failed float or internal short) inside the tank; Signal wire shorted to earth, for example chafed wiring near the tank or under the vehicle; Corroded, wet or damaged connector at the fuel pump module or sender; Damaged or corroded earth connection shared with the sender circuit; Fault in the instrument cluster or body control module that reads the fuel level signal (depends on model, as some vehicles route the signal this way); Internal fault in the engine control unit input circuit; Float stuck or fuel pump module damaged mechanically, giving a false empty reading.

P0462

Fuel Level Sensor A Circuit Low.

Generic
Powertrain
Generic code
Low severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
4: AreaAuxiliary emission controls
62: FaultThe specific fault in that area

What it means

P0462 is the generic code for a low signal from the fuel level sensor A circuit. The control unit saw the sensor's voltage or resistance signal sit below the expected range, which usually points to a short to earth in the circuit or a sensor reading as empty or out of range. The fuel gauge and fuel level reading are often affected, though the engine itself normally runs as usual.

Symptoms

Fuel gauge reads empty, stuck at the bottom or behaves erratically
Low fuel warning light on when the tank is not low
Malfunction indicator lamp on
Fuel gauge reading jumps or drops while cornering or after refuelling
Fuel level reading in the diagnostic data does not change after filling the tank
Evap monitor not completing or related evap codes stored

Possible causes

Faulty fuel level sender (worn track, failed float or internal short) inside the tanklikely
Signal wire shorted to earth, for example chafed wiring near the tank or under the vehiclelikely
Corroded, wet or damaged connector at the fuel pump module or senderpossible
Damaged or corroded earth connection shared with the sender circuitpossible
Fault in the instrument cluster or body control module that reads the fuel level signal (depends on model, as some vehicles route the signal this way)possible
Internal fault in the engine control unit input circuitrare
Float stuck or fuel pump module damaged mechanically, giving a false empty readingrare

How to diagnose

Read and record all stored codes and the freeze frame data, and note whether other fuel level or evap codes are present
Compare the fuel gauge reading with the live fuel level data and the actual amount of fuel in the tank
Inspect the wiring and connectors at the fuel pump module and along the route to the control unit for chafing, water ingress, corrosion or pin damage
Check the live fuel level value while changing the tank level if possible, to see whether it moves or stays fixed low
Check the sender circuit for a short to earth by measuring the signal wire with the connector unplugged, following the manufacturer's wiring diagram
Measure the sender resistance across its range and compare it with the specification for the model
Check the reference supply and earth at the sender connector, and test earth connections for resistance
If the circuit and sender are good, check the instrument cluster or control unit input against the wiring diagram and technical data for the model

How to fix

Replace the fuel level sender or fuel pump module if its resistance is out of specification or the readings are erratic
Repair or replace the damaged signal wiring where it is shorted to earth
Clean, dry and repair or replace corroded or damaged connectors and terminals
Repair poor earth connections
Repair or replace the instrument cluster or control unit only after the wiring and sender have been proven good
Clear the codes after the repair and confirm the fuel level reading and gauge now follow the actual fuel level

Can I keep driving?

Low severity

The car can normally be driven as the engine is usually unaffected, but the fuel gauge may be unreliable, so track fuel use by mileage and refuel regularly to avoid running dry. Book it in soon, as the fault will also stop some evap monitoring from completing.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.