P0463: Fuel Level Sensor Circuit High Input

What does the P0463 error code mean?

The P0463 diagnostic trouble code stands for "Fuel Level Sensor Circuit High Input." This code is triggered when the engine control module detects an abnormally high voltage signal from the fuel level sensor. The fuel level sensor, typically located inside the fuel tank, monitors the fuel level and sends this information to the engine control module and fuel gauge.

Why it's important to address the P0463 error code

A malfunctioning fuel level sensor can result in inaccurate fuel readings, leaving the driver unaware of the actual fuel level. This symptom can increase the likelihood of running out of fuel unexpectedly, potentially leading to unsafe driving conditions or an inoperable vehicle. Additionally, it may mask other issues in the fuel system, such as fuel pump problems.

Can I safely drive my car with this error code?

Driving with the P0463 code is generally safe since it does not directly affect the engine's performance. However, the inability to accurately monitor the fuel level poses a risk of running out of fuel, which could lead to a dangerous situation, especially in heavy traffic or remote areas. Addressing the issue promptly is recommended.

Common symptoms of the P0463 error code

• Illuminated check engine light

• Inaccurate or fluctuating fuel gauge readings

• Fuel gauge stuck at full or empty

• Difficulty predicting fuel consumption

• Running out of fuel unexpectedly

How to diagnose the P0463 error code

Diagnosing the P0463 code involves these steps:

• Scan for codes: Use an OBD-II scanner to confirm the P0463 code and check for related codes.

• Inspect fuel level sensor: Check the sensor inside the fuel tank for damage or wear.

• Test the circuit: Measure voltage and continuity in the fuel level sensor circuit using a multimeter.

• Inspect wiring and connectors: Look for corrosion, loose connections, or damaged wires in the fuel system.

• Verify engine control module input: Ensure the engine control module is receiving and processing the correct signals from the fuel level sensor.

How to repair the P0463 error code

Repairing the P0463 code typically involves:

• Replacing a faulty fuel level sensor.

• Repairing or replacing damaged wiring or connectors in the sensor circuit.

• Cleaning corrosion from electrical connections in the fuel system.

• Replacing the fuel pump assembly if the sensor is integrated into the pump.

• Clearing the code and test-driving the vehicle to confirm a successful repair.

More information on OBD-II diagnostic trouble codes

On-board diagnostics (OBD-II) and diagnostic trouble codes (DTC) are part of your car's self-diagnostic system. The five-character alphanumeric code identifies the part and problem. Check out Edmunds' growing database of diagnostic trouble code information here.