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P0463 OBD-II Error Code: Fuel Level Sensor Circuit High Input
Diagnostic Trouble Code (DTC): P0463
P0463 Code Definition
When the powertrain control module (PCM) receives an input from a fuel gauge (or fuel level sensor) that is higher than the actual fuel level in the tank, it will store code P0463 and the Check Engine light will illuminate.
What does the code P0463 mean
The PCM determines the amount of fuel in the tank using low voltage input signals. Typically, the highest voltage reading will be five volts, and any voltage reading outside the manufacturer’s normal range will display a code P0463.
What causes the code P0463?
Some of the most common reasons for PCM to store the P0463 code are:
- Problem with the fuel level sensor circuit.
- Defective fuel level sensor
- Damage to the fuel level sensor float in the fuel tank.
- Damage or corrosion to the fuel tank.
- PCM problem (rare)
What are the symptoms of the P0463 code?
There are several symptoms the driver can detect when the P0463 code is stored. Belong to them:
- Engine warning light comes on.
- Fluctuating or inaccurate fuel gauge
- The fuel warning light illuminates and / or the low fuel alarm sounds.
How can a mechanic diagnose the P0463 code?
When diagnosing the P0463 code, the mechanic will first check this code and any other codes that have been written with the OBD-II scanner. They then erase the code and try to recreate the circumstances in which it was first registered. As they do so, they will monitor the fuel gauge and its data to determine if it is erratic or steady, if there is more or less fuel in the tank than it actually is, and so on.
After doing this test, the mechanic will systematically work through probable causes, clearing the code and testing again with each repair until the code is finally resolved.
The most common errors when diagnosing the P0463 code
Technicians report some of the most common errors and misdiagnoses of the P0463 code are:
- Replace the fuel pump when the problem is actually a damaged or defective fuel gauge or fuel level sensor.
- Larger and more expensive components should be replaced before checking cables and connectors for faults or short circuits.
- Replace the fuel gauge if the problem is corroded or damaged cable or connector.
How serious is the P0463 code?
This code does not present an immediate threat to your vehicle, but may put you in a dangerous or at least uncomfortable situation. If you do not know how much fuel your vehicle has, you may run out of fuel when you are away from home or in poor conditions. If your vehicle gets stuck in a traffic jam due to lack of fuel, the situation can also be very dangerous.
What repairs can fix the code P0463?
Some of the most common fixes for code P0463 include:
- Repair or replacement of the fuel tank
- Repair or replacement of the fuel level sensor float
- Repair or replacement of the fuel level sensor.
- Replace the fuel level sensor harness.
- Tighten the loose connection in the fuel level sensor circuit.
Additional notes regarding code P0463
While you may be able to determine how much fuel your vehicle has based on mileage, it is still important to get this code resolved as soon as possible, especially if you need to get an OBD-II emissions test to renew your vehicle’s registration in your state. When the fuel level sensor is read as inaccurate or erratic, the PCM will keep the Check Engine indicator lamp on, which means the emissions test cannot be passed until the problem is resolved. Fortunately, however, this problem can usually be easily fixed without incurring high costs.