Error Code P0463: Fuel Level Sensor Circuit High Input
Understand the symptoms, causes and repair solutions of trouble code P0463. If you’re unfamiliar with this repair code, you may be asking, how do I fix trouble code P0463? Here are some basic steps to take with most issues related to a high input from your fuel level sensor circuit.
What Is a Fuel Level Sensor Circuit High Input?
For most makes and models of vehicle, your fuel level sensor is attached directly to your fuel pump module. It uses a float, arm and resistor to measure the current fuel level. That level is communicated either with a fuel pump module or powertrain control module. Depending on your electrical system, the fuel level sensor typically operates on a five-volt system. As the fuel level changes, so does the voltage signal.
Another essential part of this sensor is the grounding. Some sensors use a separate grounding wire, but others are grounded through the fuel tank itself or the frame. It’s important to check your service manual and identify how your fuel level sensor is grounded.
A high input signal means that your powertrain control module is measuring a signal above five volts, or your particular maximum signal, for a specific duration of time. This is most commonly caused by a short in the circuit, although there are some other common causes to consider.
Symptoms of Trouble Code P0463
Because the issue is an electrical one, your gauges will be the system most likely affected. In addition to sending trouble code P0463 and illuminated your malfunction indicator lamp, a high input will likely cause your fuel level gauge to either fluctuate or remain at full or empty. Another common symptom is a fuel light warning. What does the code P0463 mean? While it may never affect your engine’s performance, this trouble code is important to resolve in order to restore your correct fuel level reading.
Any part of the circuit from your fuel level sensor to your powertrain control module could be the culprit. A short in the wiring is the most common cause, so your first step should be to inspect the entire system for any sign of a short. Don’t forget these areas of the fuel level sensor circuit as you inspect it for possible damage:
- Fuel level sensor
- Wire harness
- Ground strap on fuel tank
- Ground circuit
- Instrument cluster
- Powertrain control module
The easiest step that may restore your gauge is to inspect your fuel tank and wiring harness. Most fuel level sensors rely on a grounding strap on the fuel tank, so check this thoroughly for any corrosion or rust damage. The connectors on the wiring harness are also likely sources of damage.
Test your ground circuit with a voltmeter and verify the correct voltage depending on your vehicle. Look for high resistance as a sign of damage to the ground circuit that will need to be repaired.
Depending on your make and model of vehicle, you may need to replace the entire fuel pump in order to restore the functionality of your fuel level sensor. Either way, start with the sensor. Use your voltmeter to check the resistance and ensure there’s no internal issue. A faulty sensor will need to be replaced, whether you can replace it separately or as a part of your entire fuel pump.
Finally, although unlikely, your entire powertrain control module or instrument cluster could be damaged. This requires more experienced electrical experience to repair the wiring. Be sure you have the knowledge and a vehicle-specific wiring diagram before attempting to repair either of these systems. After you’ve solved your OBD-II scanner error code P0463 problem, you should see your fuel level gauge restored.