P0463

What it means

P0463 is the generic code for a Fuel Level Sensor A circuit high fault. The control unit has seen the fuel level sensor signal voltage sit above the expected range, usually near the top of its scale, for longer than the allowed time. The fuel gauge reading may then be wrong or stuck, and the exact trigger voltage varies by model.

Symptoms

• Fuel gauge reads full or stays stuck at one position regardless of actual fuel level
• Fuel gauge needle pegged at maximum or behaving erratically
• Low fuel warning light never comes on, or comes on at the wrong time
• Malfunction indicator lamp illuminated
• Inaccurate range or fuel economy readings on the trip computer
• Evaporative system monitors may not complete or may set other codes

Possible causes

• Open circuit in the sensor signal or ground wire inside the tank wiring, giving a high signal voltagelikely
• Faulty fuel level sender (worn track, failed float or internal open circuit) in the fuel pump modulelikely
• Corroded, loose or damaged connector at the fuel pump module or in the boot or underbody wiringlikely
• Poor or missing sensor ground connectionpossible
• Signal wire shorted to a voltage supply elsewhere in the harnesspossible
• Fault in the instrument cluster or control unit that processes the fuel level signal (layout is model dependent)rare

How to diagnose

1. Read all stored codes and freeze frame data, and note whether other fuel level, evaporative or cluster codes are present
2. Compare the fuel gauge reading with the known amount of fuel in the tank and see whether it changes after refuelling or driving
3. Inspect the wiring and connectors at the fuel pump module and along the harness for corrosion, water ingress, chafing or pushed-out pins
4. View live data for the fuel level sensor signal, if available, and check whether it is fixed at a high value or moves as expected
5. With the connector disconnected, check for the reference voltage and a good ground at the sensor connector, following the wiring diagram for the model
6. Check the signal wire for continuity and for a short to voltage between the sensor and the control unit
7. Measure the sender resistance across its range, or move the float arm if accessible, and compare with the manufacturer specification
8. If the wiring and sender test good, check the control unit or cluster connections and refer to model-specific procedures

How to fix

• Repair or replace damaged wiring, and clean or replace corroded connectors
• Replace the fuel level sender or fuel pump module assembly if the sensor readings are out of specification
• Restore the sensor ground connection by repairing the ground wire or ground point
• Repair the signal wire short to voltage once the fault has been located
• Replace or repair the instrument cluster or control unit only after all wiring and sensor faults are ruled out, then clear the codes and verify the repair

Can I keep driving?

Nearby codes

• P0462GenericFuel Level Sensor A Circuit Low
• P0464GenericFuel Level Sensor A Circuit Intermittent