P0463 Code - Fuel Level Sensor Circuit High Input

What Does P0463 Mean?

The fuel level sensor is mounted in the fuel level sensor unit. The sensor detects a fuel level in the fuel tank and transmits a signal to the Engine Control Module (ECM). The fuel level sensor consists of two parts, one is mechanical float and the other side is variable resistor. The fuel level sensor output voltage changes depending on the movement of the fuel mechanical float.

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What are the common causes of P0463 ?

The most common cause of this malfunction is probably a faulty instrument cluster but other possibilities are also feasible. Damage to the fuel tank can interfere with the fuel level sender and cause it to read incorrectly, there may be an open or shorted ground in the fuel level sensor’s ground, the ground wire or strap could have become corroded or loose and ground resistance is excessive, the signal circuit may also be shorted (either to voltage or ground) or broken. The PCM, BCM, or other fuel level controller could also be faulty but this is the least likely cause.

How do you troubleshoot P0463 ?

Look for damage to the tank indicating impact that may have damaged the fuel pump or sender. If the engine displays a miss and there wasn't a code, determine which cylinder is misfiring. If the exhaust manifold is visible, spay or pour a small amount of water on each cylinder exhaust port. Water will evaporate immediately on good cylinders and slowly on the missing cylinder. If this can't be accomplished pull the plugs and check the condition. It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem.



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