How To Fix P0463 Obd2 Code? Fuel Level “A” Circuit High

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How To Fix P0463 Obd2 Code?
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Is your Check Engine Light on? P0463 is a DTC (diagnostic trouble code) that appears due to multiple reasons. Before you take the necessary actions to resolve the issue, you must find the reasons for this code. so, you can fix the issue easily.

The issue is not challenging but a bit annoying. The immediate danger of low fuel can be risky when you are driving on the highway away from the fuel pump. But, worry not. We are here to tell you how a visual inspection and simple tricks can help you to get over this trouble code!

Definition of P0463 Code

When the fuel level sensor reports a higher-than-actual fuel level, the powertrain control module store a P0463 code. And, as a result, the Check Engine Light gets turned on.

If the tank has enough fuel, this could happen due to an error in the fuel sensor. The wiring harness can also be a reason for this faulty code. So, this way a driver cannot know the actual fuel level.

Meaning of the Code P0463 

Meaning of the Code P0463 

If your car’s PCM detects an inaccurate fuel level from the fuel level sensor, it will trigger the P0463 code. The code is a clear sign that PCM is getting incorrect information about the gas or fuel level in the tank. Simply, you can say that PCM thinks there is pretty enough fuel or a very low amount of fuel left in the car. And, in a result, the driver cannot know the exact amount of gas left in the tank. 

Symptoms of P0463 Obd2 Code

In the case of the P0463 code, you can face any of these symptoms:

  • PCM detects an out-of-range voltage reading from the fuel level sensor
  • The fuel gauge is inaccurate or fluctuates
  • The fuel light is on or illuminated 
  • The alarm is sounding for low fuel

Causes of P0463 code

The PCM stores the P0463 code for multiple reasons, the most common are:

  • Faulty or damaged fuel level sensor circuit
  • Issues with the fuel level sensor itself 
  • Damaged fuel level sensor floating in the gas tank
  • Corrosion or rust in the gas tank 
  • Problems with the PCM 
  • A faulty fuel level pump

How to Diagnose P0463 code

If you’re experiencing problems with your car due to a P0463 code, don’t worry as we are here to help you. Firstly, determine whether the issue is with the fuel tank or look if there is gas tank damage. And, for this purpose, you can use an OBDII scanner. The scanner will tell you about all the problems with the gas tank. But, if you did not get any probable causes, it will be better to consult a professional.

Process To Diagnose P0463 Code

  • Step 1: If your car is displaying the code P0463, firstly verify if this code is present. You can also check if other codes are present there. 
  • Step 2: Take all the necessary steps to clear the codes, but first of all, try to find the possible causes of this code. 
  • Step 3: During this whole process, keep an eye on the fuel gauge. And, you should also check the real-time data displayed on the obd ii scanner.
  • Step 4: Changes in the voltage outside of the manufacturer’s specs will let you know whether the sensor is detecting too much fuel or is implying displaying a low amount of fuel in the tank. You can also get to know whether the problem is physical or electrical.
  • Step 5: Also, check the wiring harness and fuel tank sensor and look if there is any damage. Furthermore, you can also check the connectors, as they can also be a reason for this problem. If everything looks fine, remove the gas tank for further inspection.
  • Step 6: If the P0463 code appears on your OBDII scanner, take your vehicle to a professional. The fuel tank draining, removal, and inspection process are best done by a professional. There could be many reasons for this code including a faulty fuel gauge, fuel level sensor, or poor conditions of the tank resulting in voltage signal or less or more fuel than the actual. The professional will look for all these reasons!

Tools You Need to Diagnose P0463 code

OBD2 Scan Tool

An OBD2 scan tool allows you to connect to your car’s onboard diagnostics port and get information about the car’s engine and other systems. You can also use it to troubleshoot problems with the car and can address them before a tune-up. 

Digital Multimeter

A digital multimeter is used to measure current, resistance, and voltage. The voltage depends on multiple factors. It can be used to diagnose electrical problems in your car or to test the functionality of various electrical components of your vehicle.

A Common Mistakes You Must Avoid When Diagnosing P0463

When you are resolving the P0463 code, it is important to follow the troubleshooting steps carefully. If you don’t, you may end up replacing perfectly good parts. The following are some common mistakes that people often make:

  1. Not following the troubleshooting steps 
  2. Replace the perfectly good parts without fixing the issue
  3. When the P0463 code is triggered, it may be necessary to replace the fuel pump. However, before doing so, it is important to inspect the fuel gauge or fuel level sensor. If these parts are damaged or faulty, replacing the fuel pump will not solve the issue. But, many people replace the fuel pump!
  4. When a part in your car is larger and more expensive, it’s often tempting to replace it without inspecting the wiring and connectors for faults. But, it’s always important to check the wiring before replacing a part. Faulty wiring can cause many problems. Check the wiring so you may not have to replace the expensive parts. It is a good way to save time and money.
  5. The replacement of the fuel gauge is the biggest mistake you can make. The problem can be with wires or connectors

How To Fix P0463?

How To Fix P0463?

The code P0463 is associated with a malfunction of the fuel level sensor or the gas tank. Resolve the issue by:

  • Tighten all the loose connections of the fuel level sensor circuit
  • Replace the fuel level sensor or the fuel tank
  • Repair the wiring harness

if the issues persist even after these repairs, consult a professional!

Tips for further avoiding P0463 OBD2 Error

If you experience the P0463 trouble code, you will not get to know the actual level of fuel. It happens because of damage to the fuel tank or the wires around the fuel level sensor. Well, you cannot do anything to prevent external damage, but take the necessary steps to avoid internal wiring issues.

Anti-rust treatments can also help. Be very careful while installing engine components. Make sure all the wires are securely fastened. Also, check that no wires are rubbing against parts of the engine which can be a reason for damage.


If you see your Check Engine Light turn on, verify the codes that are present with an ObdII scanner. If you cannot do that by yourself, take professional assistance for diagnosis and repair. A P0463 code means you can run out of gas anytime.

If you see a low fuel light, check the loose connections of wires to the fuel level sensor. You must ask a professional to inspect the gas tank or your car and repair it to resolve the issue.