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P0463 Severity
Once the vehicle's onboard system no longer detects the issue, most codes will disappear on their own. If your vehicle still has this code, however, it should be properly diagnosed to avoid a more serious problem.
For a proper diagnosis, RepairPal Certified shops have the equipment, tools, and expertise.
Moderate severity codes might not threaten the vehicle's safety or functionality immediately, but you should still get it diagnosed within a reasonable time frame to keep your car running well.
The Fuel Level Sensor tells the engine control module (PCM) how much fuel is in the fuel tank. When the PCM detects an irrational signal from the fuel level sensor, it will set code P0463.The Fuel Level Sensor may be part of the fuel pump.
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OBD-II Code P0463 is defined as a Fuel Level Sensor Sensor High Circuit Input
The Fuel Level Sensor tells the Power Train Computer or PCM how much fuel is in the fuel tank. It does this by using a float on a lever that is connected to an electronic device called a potentiometer. A potentiometer can translate the movement or position of a lever into a voltage signal that a computer can understand. For example, the opening and closing of the throttle as a driver operates the gas or throttle pedal also uses a potentiometer. Code P0463 indicates the voltage signals from the Fuel Level Sensor are irrationally high and indicating the impossible condition of there's more fuel in the tank than the tank can actually hold.
Diagnostic Theory for Shops and Technicians When inspecting code P0463, always write down the freeze frame data, so you have a frame of reference that indicates the vehicle operating conditions when P0463 was triggered and the PCM turned on the MIL. See if you can duplicate the conditions that set the code with a test drive. Pay careful attention to the fuel level sensor data, is it steady or is it erratic? Look at the translated fuel level sensor data, does it say the fuel tank is nearly full? If so, find a way to some how measure the contents of the fuel tank. I usually go to a filling station and fill up the fuel tank and if it takes more than 1-2 gallons, I know that the Fuel Level Sensor is not reading correctly. At this point I would do pinpoint tests on the sensor, the connector and wiring. In some cases, these pinpoint tests may necessitate the removal of the fuel tank.