P0463: How to Diagnose & Fix — Fuel Level Sensor Circuit High Input
24 vehicles · 9 makes · $150-$1,400 repair
How to diagnose and fix P0463: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
GMC Sierra 3500HD · 2007–2014
On 2007–2014 Sierra 3500HD models, the fuel tank mounting straps and the fuel level sender unit are prone to corrosion, causing inaccurate fuel gauge readings and in some cases complete sender failure. NHTSA complaint data documents numerous owners reporting sudden fuel gauge drops to empty or erratic readings unrelated to actual fuel level. The plastic float arm on the sender can also crack, exacerbating the problem.
Common Symptoms
- Erratic or inaccurate fuel gauge readings
- Fuel gauge stuck on full or empty regardless of tank level
- Low fuel warning activating with significant fuel remaining
- Running out of fuel despite gauge showing fuel remaining
- DIC fuel range displaying incorrect distance to empty
How to Fix
Replace fuel level sender/pump module assembly (ACDelco M100087 or equivalent). Inspect and replace corroded fuel tank straps if necessary (GM part 15811919). Tank may require drop for full access. Application of anti-corrosion spray on new straps is recommended. Labor 2–3 hours; flush tank if sediment contamination is present.
Sources for this issue (3)
Hyundai Elantra · 2001–2006
Owners of 2001-2006 Elantras frequently report in-tank fuel pump module problems, including hard starting, no-start conditions, and erratic fuel gauge behavior due to sender wear. On higher-mileage cars, the pump can become weak or fail intermittently, especially after hot soak. Forum reports and repair histories commonly pair pump replacement with sender issues because both are integrated in the tank module.
Common Symptoms
- long crank before starting
- engine cranks but will not start
- loss of power under load
- fuel gauge reads empty when tank has fuel
- fuel gauge fluctuates unexpectedly
How to Fix
Check fuel pressure during crank/no-start events and verify power and ground at the pump connector before condemning the module. If pressure is low or absent and wiring is intact, replace the fuel pump module or pump/sender assembly. It is also wise to inspect the tank connector and replace the fuel filter if service history is unknown.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Hyundai 31110-2D501 fuel pump and sender module assemblyOEMHyundai 31110-2D501
complete in-tank pump/sender module after pressure/electrical/sender testing confirms the integrated module branch Fitment/availability: 2001-2006 Hyundai Elantra four-door and five-door within the retailer's 2000-2006 fitment. Confirm g…
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Sources for this issue (2)
GMC Sierra 1500 · 2003–2007
A very common GMT800 complaint is sulfur contamination and wear of the fuel level sensor contacts inside the tank module, causing the gauge to read empty, full, or fluctuate unpredictably. Owners often see a low-fuel warning with plenty of fuel in the tank or watch the gauge drop suddenly while driving. GM offered special coverage for premature fuel level sensor wear on some 2005-2007 midsize SUVs (Envoy, TrailBlazer, Rainier, SSR), but that program does not include the Sierra.
Common Symptoms
- fuel gauge reads empty when tank is full
- fuel gauge fluctuates while driving
- low fuel light comes on incorrectly
- distance-to-empty inaccurate
- intermittent gauge operation
How to Fix
Confirm the issue by comparing scan-tool fuel level data and observing whether the sender reading jumps erratically. The usual repair is replacement of the fuel level sensor or, more commonly, the entire fuel pump module assembly because of labor overlap and the age of the pump. Connector condition and ground integrity should also be checked during service.
Sources for this issue (2)
RAM 1500 · 1994–2010
Volvo S60 · 2001–2007
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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?
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.
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?
Repair costs for P0463 range from $150 to $1,400, depending on the vehicle and root cause.
Which vehicles are affected by P0463?
Au7o has documented P0463 across 24 vehicle models from 9 manufacturers: Chevrolet, GMC, Hyundai, Infiniti, Jeep, Nissan, RAM, Saturn, Volvo.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.