Worn or dirty resistive track or wiper in the fuel level sender inside the tank; Corroded, loose or damaged connector at the fuel pump and sender module or at the tank wiring; Chafed or broken wiring between the sender and the control unit, including intermittent open circuit or short to earth; Poor earth connection shared by the sender circuit; Sender float damaged, stuck or fouled by debris or contaminated fuel; Fault in the instrument cluster or control unit handling the fuel level signal, depending on model.

P0464

Fuel Level Sensor A Circuit Intermittent.

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
64: FaultThe specific fault in that area

What it means

P0464 is the generic code for an intermittent fault in the fuel level sensor 'A' circuit. The control unit has seen the fuel level signal jump, drop out or read implausibly for short periods rather than fail completely. This usually points to a poor connection, worn sensor track or wiring fault in the tank sender circuit.

Symptoms

Fuel gauge flickering, jumping or dropping to empty and back
Fuel gauge reading inconsistent after cornering, braking or on rough roads
Low fuel warning light coming on at random
Malfunction indicator lamp on, possibly with evaporative system codes
Trip computer range reading erratic or showing no figure

Possible causes

Worn or dirty resistive track or wiper in the fuel level sender inside the tanklikely
Corroded, loose or damaged connector at the fuel pump and sender module or at the tank wiringlikely
Chafed or broken wiring between the sender and the control unit, including intermittent open circuit or short to earthpossible
Poor earth connection shared by the sender circuitpossible
Sender float damaged, stuck or fouled by debris or contaminated fuelpossible
Fault in the instrument cluster or control unit handling the fuel level signal, depending on modelrare

How to diagnose

Read all stored codes and freeze frame data, noting fuel level, mileage and conditions when the fault set, then check for related codes
Watch the live fuel level value and the gauge while gently moving the car, rocking it or tapping the tank area, and note any sudden jumps
Inspect the connector and wiring at the fuel pump and sender module and along the harness for corrosion, water ingress, chafing or pin damage
Check the sender circuit earth and supply voltage against the manufacturer wiring diagram
Wiggle test the harness and connectors with live data displayed to find where the signal drops out
Measure sender resistance across its full travel, if accessible, and compare with specification for the model; look for sudden steps or open readings
Check fuel for contamination and inspect the float and track for damage once the module is removed, following safe fuel handling procedures
Check whether the fuel level signal is shared with another control unit, as the wiring route varies by model

How to fix

Repair or replace corroded or damaged connectors and terminals
Repair or replace chafed or broken wiring in the sender circuit
Replace the fuel level sender or the pump module assembly if the track or float is faulty
Clean and repair earth connections to give a solid return path
Clear any fuel contamination and replace faulty components as needed, then confirm the signal is stable on a road test
Replace or repair the instrument cluster or control unit only after wiring and sender are proven good

Can I keep driving?

Low severity

The car can normally be driven, but the fuel gauge may be unreliable, so keep track of fuel used and refill early to avoid running out. Book it in soon, as the fault may become permanent and could affect evaporative system monitoring.

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