P0463 Code: Fuel Level Sensor Circuit High Input

🟢 Low severity · drivable

Safe to drive, but the fuel gauge may read incorrectly, so keep track of your fuel manually.

What P0463 means

The fuel level sensor is reporting voltage that's too high, which the computer reads as a full tank. The fuel gauge may be stuck on full or read incorrectly.

How the system works

The fuel level sensor is a float on an arm inside the tank, attached to a variable resistor. As the float moves, the resistance changes, and the computer or the instrument cluster turns that into a gauge reading. On most vehicles the sensor is part of the fuel pump module.

P0463 means the voltage on that circuit is higher than it should ever be. The usual electrical cause is an open circuit: a worn resistor track, a broken wire or an unplugged or corroded connector. The gauge often sits on full, on empty, or jumps around, depending on how the manufacturer wired the circuit.

Symptoms

Check engine light is on
Fuel gauge stuck on full or reading incorrectly

Common causes

most common: Faulty fuel level sensor (open circuit)
common: Loose or corroded connector
less common: Damaged wiring in the sensor circuit

How to diagnose P0463

Compare the gauge with the scan tool. Read the fuel level value on a scan tool and compare it with the gauge and with how much fuel you know is in the tank. A reading pinned at 100% or 0% that never changes confirms a circuit fault.
Inspect the connector at the tank. The connector on top of the fuel pump module is exposed to road salt and water. Look for corrosion, loose terminals and broken wires. On many vehicles it can be reached through a panel under the rear seat.
Check the ground. A poor ground near the tank raises the circuit voltage in the same way an open circuit does. Clean and tighten it.
Measure the sensor's resistance. Unplug the module and measure across the sender terminals, then compare with the range given for your vehicle. An open circuit reading, or one that does not match the fuel level, means the sender has failed.
Check the wiring to the computer or cluster. If the sender tests good, check the signal wire for an open along its run from the tank forward.

How to fix it

Fix	DIY?	Typical cost
Replace the fuel level sensor (usually part of the fuel pump assembly)	Mechanic	$200–500
Repair open sensor wiring	Mechanic	$50–150

Common misdiagnoses

Replacing the whole fuel pump module before checking the connector and ground, which are cheaper and common faults.
Replacing the instrument cluster. P0463 is set from the sensor circuit, and the gauge is usually only displaying the bad signal.
Assuming a gauge that reads full means a full tank. Track mileage until the repair is done, so you do not run out of fuel.

P0463 vs similar codes

P0462: P0462 is the opposite: circuit voltage too low, usually a short to ground or a shorted sender.
P0461: P0461 means the reading is within range but does not change as fuel is used, which points at a stuck float.
P0464: P0464 is an intermittent signal, most often a worn resistor track or a loose connection.