P0463

Fuel Level Sensor A Circuit High

Fuel level sensing Generic OBD-II Low

What it means

P0463 means the ECM sees a higher voltage than expected from the fuel level sensor circuit, so the reported fuel level is implausible. The usual result is a fuel gauge that reads wrong or gets stuck, most often from a failing tank sending unit or an open in its wiring. The engine runs normally, so the main risk is trusting a bad gauge and running out of fuel.

Low

Can I keep driving? Mechanically fine to drive, but don't trust the fuel gauge — track your mileage so you don't run out of fuel unexpectedly.

Real-world scan data

Seen in

742

scans in the past year

Found in

0.1%

of scans

0.2%

of scans that found faults

Appears alongside · share of P0463 scans

P0452in 10.1% of scans

P0300in 8.2% of scans

P0183in 7.4% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Inaccurate, stuck, or erratic fuel gauge
Fuel gauge may read full or empty regardless of actual level
Check-engine light on
Low-fuel warning light may behave incorrectly

Common causes

Most likely first

Faulty fuel level sensor / sending unit float in the tankLikely
Open or high-resistance wiring/connector to the sending unit (a high signal often means an open)Common
Corroded or damaged connection in the sensor circuitCommon
Faulty instrument cluster (less common)Less often

How to diagnose & fix

Work through it in order

Confirm the fuel gauge behaviour against a known fuel level.
Inspect the wiring and connector to the tank sending unit for opens or corrosion.
Measure the sending unit's resistance across the float's range and compare to spec.
Replace the fuel level sensor / sending unit if it's out of range.
Only consider the instrument cluster if the sensor and wiring test good. Clear and re-test.

FAQ

Quick answers

Is it safe to drive with P0463?+

Yes, mechanically — the engine runs fine. The catch is you can't rely on the fuel gauge, so watch your trip odometer to avoid running out of gas.

Can I just clear P0463?+

It will return once the ECM re-reads the sensor unless the sending unit or its wiring is repaired.

Read & clear P0463 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX