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.
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.
Related codes
Often seen with P0463
Read & clear P0463 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX