P0463 on Infiniti: How to Diagnose & Fix
Fuel Level Sensor Circuit High Input
2 Infiniti models · 2 documented issues · $300-$900 repair
P0463 on Infiniti by model: symptoms, diagnosis and fix
A common Nissan/Infiniti issue on this era of FX35 is inaccurate fuel level readings caused by wear or contamination of the fuel level sending unit inside the tank. Owners report the gauge sticking, dropping suddenly, or showing empty with fuel still in the tank, sometimes accompanied by a check engine light.
Common Symptoms
- Fuel gauge reads empty when tank is not empty
- Gauge fluctuates unpredictably
- Low fuel warning comes on too early
- Distance-to-empty is inaccurate
- Check engine light with EVAP/fuel level correlation faults
How to Fix
Diagnosis involves comparing scan-tool fuel level data with actual tank fill amount and checking for sender-related codes. Repair typically requires replacing the affected fuel level sender or pump module assembly through the access panel under the rear seat/cargo area, depending on configuration. Typical cost is about $300-$800 using quality parts and new tank seal hardware.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Infiniti fuel-gauge sending unitOEMInfiniti 25060-CG00E
Confirm VIN, physical sender position and required seal because the tank contains more than one level-sensing
- Genuine Infiniti primary fuel-gauge sending unitOEMInfiniti 25060-1CB0C
Confirm VIN and the 25060Y diagram position; do not confuse it with the separate 25060YA/1CB1C level sensor.
- Genuine Infiniti secondary fuel-level sensorOEMInfiniti 25060-1CB1C
It is not listed for 2009 and is separate from 1CB0C; verify VIN, connecto
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Owner tips & cautions
- TipIf the gauge is erratic, track mileage manually until the sender is repaired to avoid running the tank dry.
- TipReplace the tank seal and inspect the electrical connector for heat damage whenever the module is removed.
Sources for this issue (1)
Some M35 owners report inaccurate fuel level readings, including gauges that stick, read empty when fuel remains, or fluctuate unexpectedly. The issue is commonly related to wear or contamination in the fuel level sending unit inside the tank, which can affect trip planning and trigger low-fuel warnings incorrectly.
Common Symptoms
- Fuel gauge reads empty with fuel in tank
- Erratic fuel level movement
- Low fuel warning comes on too early
- Inaccurate distance-to-empty estimate
How to Fix
Compare gauge behavior to actual fill volume and scan for fuel level sensor data if available. Repair typically requires replacement of the faulty fuel level sending unit or pump module assembly, depending on which side of the saddle tank is affected. Because tank access is labor-intensive, many owners replace related seals and inspect the pump assembly at the same time.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- OEM early M35/M45 driver-side fuel-level sending unitOEM25060-AL51A family
Confirm VIN/engine and failed side; not the passenger sender.
- OEM late M35/M45 driver-side fuel-level sending unitOEM25060-1NC0C
Confirm VIN and failed side; do not substitute the early sender.
- Genuine Infiniti passenger-side fuel-level sensor 25060-CD00AOEM25060-CD00A
Early passenger-side sender branch after testing identifies that side Fitment/availability: Select 25060-CD00A, listed as passenger side for 2006-2009 M35 applications in the early engine catalog. Confirm VIN/engine because the listing d…
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Owner tips & cautions
- TipTrack mileage manually until the repair is completed, since the gauge may not be trustworthy.
- TipIf the tank is being opened, replace the seal and inspect wiring connectors to prevent future access-related leaks or faults.
Sources for this issue (1)
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 Infiniti?
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 Infiniti it is documented across 2 models: FX35, M35.
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 Infiniti?
Published repair estimates on Infiniti range from $300 to $900 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.