P0463 on Ford: How to Diagnose & Fix
Fuel Level Sensor Circuit High Input
1 Ford model · 1 documented issue · $200-$700 repair
P0463 on Ford by model: symptoms, diagnosis and fix
Gasoline F-350s of this era (5.4L Triton V8 and 6.8L Triton V10) use a Fuel Pump Driver Module bolted directly to the steel frame rail behind the rear axle, where it takes the full spray of road salt and water. The aluminum module against the steel frame sets up galvanic corrosion; the housing corrodes through, moisture reaches the circuit board, and the module stops driving the in-tank pump. The result is intermittent stalling, extended cranking or an outright no-start, often with FPDM circuit codes stored. Trucks in salt-belt states fail earliest. This is a chassis/electrical failure and is unrelated to the CP4.2 high-pressure pump story on the diesel trucks.
Common Symptoms
- Intermittent stalling
- Extended crank or no-start that comes and goes
- Loss of power under load
- Erratic or stuck fuel gauge
- Corroded module visible on the frame rail
How to Fix
Inspect the module on the frame rail for a swollen, cracked or white-corroded housing before condemning the in-tank pump. Replace the FPDM, and critically, clean the mounting surface and use dielectric grease on the connector; many owners relocate the module to a cleaner, drier surface or add a barrier between the module and the frame to break the galvanic path. Also inspect the pigtail for green corroded terminals, which will kill a new module. The in-tank pump and sending unit are a separate wear item on the same trucks - an erratic or stuck fuel gauge with a P0463 usually means the sender resistor card, and the pump module assembly is normally replaced complete. No recall covers the FPDM.
Sources for this issue (3)
P0463 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0463 mean on a Ford?
P0463 stands for "Fuel Level Sensor Circuit High Input." This code means the fuel level sensor is reporting a voltage that is higher than the computer expects, which usually translates to a reading suggesting the tank is fuller than possible (such as more than full). The fuel level sensor is the float-and-sender unit inside the fuel tank that tells the gauge and computer how much fuel remains. A high-input signal points to an electrical problem like a short to voltage or an open in the sensor circuit, rather than an actual fuel issue. Besides an inaccurate or pinned fuel gauge, it can disturb EVAP system monitoring that uses fuel level data. On Ford it is documented across 1 model: F-350.
What are the most common causes of P0463?
The most common causes of P0463 are: Faulty fuel level sensor/sending unit (float stuck or worn), Open circuit in the fuel level sensor wiring, Short to voltage in the sensor circuit, Corroded or loose connector at the tank or sending unit, Damaged or stuck float arm inside the tank, Faulty instrument cluster or gauge driver, Faulty PCM/ECM (rare). The specific cause varies by vehicle.
How much does it cost to fix P0463 on a Ford?
Published repair estimates on Ford range from $200 to $700 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0463 on a different make?
View P0463 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.