The P0463 code involves your car’s fuel level sensor. One of your car’s computers (usually the powertrain control module or PCM) will set the code when the fuel level sensor’s signal is too high. Since it is a generic code, it is supported on various makes and models.
Read on to learn more about this error code.
What Does the P0463 Code Mean?
Diagnostic trouble code (DTC) P0463 stands for “Fuel Level Sensor “A” Circuit High.” It means that there is an unusually high voltage signal coming from your vehicle’s fuel sensor. The result is that the fuel gauge will not read accurately.
Note: Although code P0463 is a generic code specified by the Society of Automotive Engineers (SAE), the code’s definition may be different depending on the vehicle manufacturer.
You’ll find the fuel level sensor, which is also referred to as a sending unit, mounted in the fuel tank. The sensor consists of an arm with a float attached to a variable resistor (potentiometer).
When the fuel level changes, the position of the float changes, as does the sensor’s internal resistance and output signal. From that signal, the PCM determines the fuel level, then relays that information to the instrument cluster.
Code P0463 can be quite tricky because regardless of the amount of fuel in your tank, the fuel gauge will not display the correct level. And if you don’t know how much fuel is in the tank, you could end up running out of gas.
What are the Possible Causes of the P0463 Code?
There are many potential causes of the P0463 code. Here are some of them:
- Faulty fuel level sensor (sender unit)
- Fault in the fuel level sensor circuit
- Mechanically damaged sending unit arm
- Problem with the PCM (e.g., software in need of an update)
- Faulty smart fuse box or integrated power module (if equipped)
Note: If there are other codes stored in addition to P0463, the causes and symptoms may differ from those listed here.
What are the Common Symptoms of the P0463 Code?
Common symptoms that accompany the P0463 code include:
- Illuminated check engine light
- Inaccurate fuel readings (this happens when the fuel level indicated is different from the actual fuel level)
- Low fuel light that’s on or flashing
- Inability to pass an emissions test due to systems monitors that are “not ready”
- Vehicle stalls and will not restart due to a low fuel level
How to Diagnose the P0463 Code
Replacing the fuel level sensor (sending unit) can be difficult because, on many vehicles, you must remove the gas tank to access it. As such, you’ll want to do some troubleshooting (or have a professional do it for you) before replacing the sensor.
Here are a couple of videos to give you an idea of what the process might involve:
How to Fix the P0463 Code
Because the P0463 code has various possible causes, there is no single way to resolve it.
If the problem is the fuel level sensor, you may need the help of a professional to fix or replace it.
If it’s not, you must determine the underlying cause of the issue and address it specifically. On top of that, you also need to make sure your solution is applicable to your vehicle’s make and model.
Repair manuals, like those from Chilton, may help. But if you want to expand your repair know-how and to be prepared to deal with other automotive problems, invest in an ALLDATA single-vehicle subscription.