2008 Chevy Silverado P0463 Fuel Level Sensor

2008 Chevy Silverado


  • 5.3L V8
  • Horsepower: Approximately 315 horsepower
  • Torque: Approximately 338 lb-ft of torque


  • 4-speed automatic

Fuel Economy:

  • The EPA estimated fuel economy is around 14-15 MPG city and 19-20 MPG highway.

P0463 Code on a 2008 Chevy Silverado: Causes, Symptoms, and Solutions

If you own a 2008 Chevy Silverado with the 5.3L engine and have the P0463 trouble code, you’re not alone. This code relates to an issue with the fuel level sensor circuit, and it’s important to address it promptly to ensure your vehicle’s optimal performance. In this article, we will delve into the P0463 trouble code, exploring its causes, symptoms, and potential solutions to get your Silverado back on the road.

What is the P0463 Trouble Code?

The P0463 code is an OBD-II diagnostic code that pertains to the fuel level sensor in your Silverado’s fuel system. This code is also known as “Fuel Level Sensor Circuit High Input.” When the Engine Control Module (ECM) detects an excessively high voltage signal from the fuel level sensor circuit, it triggers the P0463 code.


Common Causes of P0463 on a 2008 Chevy Silverado

  • Faulty Fuel Level Sensor: The most common cause of P0463 is a malfunctioning fuel level sensor. These sensors are typically located inside the fuel tank and can wear out over time.
Fuel Level Sensor

A vehicle’s Fuel Level Sensor serves a crucial function by monitoring the accurate level of fuel in the fuel tank. This information helps drivers gauge how much fuel they have and plan their refueling stops accordingly.

  • Wiring Issues: Damaged or corroded wiring in the fuel level sensor circuit can lead to an excessively high voltage signal, triggering the P0463 code.
  • Poor Ground Connection: A weak or faulty ground connection can disrupt the electrical signal in the fuel level sensor circuit.
  • Faulty ECM: While less common, a malfunctioning ECM could misinterpret the sensor’s signal and trigger the P0463 code.

Symptoms of P0463 on a 2008 Chevy Silverado

  1. Check Engine Light: The most obvious symptom of the P0463 code is the illumination of the check engine light on your Silverado’s dashboard.
  2. Erratic Fuel Gauge: You may notice that your fuel gauge behaves erratically, showing incorrect fuel level readings or constantly fluctuating readings.
  3. Inaccurate Fuel Range Estimation: The vehicle’s computer may have difficulty estimating the remaining fuel range accurately, making it challenging to plan your trips.
  4. Reduced Fuel Efficiency: As the ECM struggles to determine the actual fuel level, it can affect the engine’s performance and lead to reduced fuel efficiency.

Diagnosing and Resolving P0463

Diagnosing and fixing the P0463 trouble code requires some technical knowledge and automotive tools. Here are the steps to address this issue:

  1. Check the Fuel Level Sensor: Start by inspecting the fuel level sensor. Ensure it is properly connected and not physically damaged. If necessary, replace the sensor.
  2. Inspect Wiring and Connections: Examine the wiring and connectors in the fuel level sensor circuit. Look for any signs of damage, corrosion, or loose connections. Repair or replace damaged components as needed.
  3. Check the Ground Connection: Verify the ground connection for the fuel level sensor circuit. Clean or repair any corroded or loose ground connections.
  4. Clear the Code: After addressing the potential issues, clear the P0463 trouble code using an OBD-II scanner. If the problem has been resolved, the check engine light should turn off.
  5. Test Drive: Take your Silverado for a test drive to ensure that the fuel gauge and fuel range estimation are functioning correctly. Monitor the check engine light for any reoccurrence of the P0463 code.
  6. ECM Inspection (If Necessary): If the issue persists after performing the above steps, it might be necessary to have the ECM inspected or replaced by a qualified technician.

Dealing with the P0463 trouble code on your 2008 Chevy Silverado may seem daunting, but with the right knowledge and tools, you can diagnose and resolve the issue. Addressing this problem promptly will help maintain your vehicle’s performance, fuel efficiency, and overall reliability. If you’re uncertain about any of the steps involved, it’s advisable to seek the assistance of a professional Chevy mechanic who can ensure that your Silverado is running smoothly once again.

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