Fuel Level Sensor Circuit High
The P0463 code means the vehicle's onboard diagnostic system has detected: Fuel Level Sensor Circuit High. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- moderate
- Estimated cost
- $150 - $600 (parts and labor)
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Common Symptoms
- Check Engine Light on
- Fuel gauge stuck on empty
- Low fuel warning always on
- Vehicle may think it is always out of fuel
Probable Causes (Ranked by Likelihood)
- Open circuit in fuel level sensor wiring Very High
- Failed fuel level sensor (open internally) High
- Disconnected fuel pump connector Moderate
- Corroded or broken wire Low
Step-by-Step Diagnostic Procedure
-
Read fuel level PID on scan tool. Stuck at empty confirms high/open circuit.
-
Check fuel pump module connector is fully seated.
-
Measure sensor resistance. Infinite ohms confirms open sensor.
-
Test wiring continuity from fuel pump connector to PCM.
Common Fixes by Vehicle
What techs usually find when diagnosing P0463 on specific vehicles — tap your vehicle for the fix and the exact part:
2004-2018 Ford F-150 5.0L/3.5L EcoBoost Moderate DIY
High fuel level sensor reading (gauge always reads full) is caused by an open circuit in the fuel sender. On F-150s, check the connector at the top of the fuel tank first. The sender float arm can also get bent from rough roads, keeping the float at the full position. Replace the sender unit.
Labor: 2-3 hours2007-2016 Chevrolet Silverado 5.3L/6.2L Moderate DIY
The fuel sender resistor card develops an open circuit, making the gauge read constantly full. GM trucks use a dual-sender system on some models -- identify which sender is faulty by monitoring individual sender readings with a scan tool. Replace only the bad sender to save time and money.
Labor: 2-3 hours2005-2015 Ford Mustang 4.0L/4.6L Moderate DIY
The fuel level sender float arm in Mustangs gets corroded at the pivot point, causing it to stick in the full position. Drop the tank, remove the pump module, and inspect the float arm. If corroded or stiff, replace the entire sender assembly. Clean the tank while it is out.
Labor: 2-3 hoursFrequently Asked Questions
Why is my fuel gauge stuck on empty?
An open circuit in the sensor or wiring produces a high resistance reading, which the gauge interprets as an empty tank.
Can I add a separate fuel gauge?
Yes, aftermarket fuel gauges with their own sending units are available, but it is usually more practical to repair the factory system.
Will P0463 affect the fuel pump?
No, the fuel level sensor and fuel pump are separate circuits. The pump will continue to operate normally even with a failed level sensor.
Sources
This page is built from documented references. Verify against your own service info before repair work.
P0463 on Diesel, EV & Equipment
The same code ID appears across other engines and platforms. The diagnostic flow varies by manufacturer — these are the platform-specific breakdowns:
See All Codes & Fixes for Your Vehicle
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