What P0463 means
The fuel level sensor in your tank is sending a signal that's too high to be real. The fuel gauge may read wrong, jump around or sit at full or empty. A worn sending unit or broken wire is the usual cause.
How the engine computer detects it
The fuel level sensor is a float on a resistor track in the tank unit. It is no emission part, but other monitors depend on it – the EVAP leak tests, for example, need at least 15 % fuel – so CARB requires it to be monitored and the usual exemption from the warning lamp does not apply. Low and high refer to the signal, not the fuel level: on GM a full tank is about 40 Ω and a low voltage, while Ford judges the resistance directly. P0463 means the signal is above its upper limit: GM above 60 % of the 5 V reference (100 of 125 samples, MIL after two trips), Saab 9-4X above 4.7 V for 5 s, Ford a resistance above 200 Ω for 30 s. Typical is an open circuit – the pull-up then drives the signal high – a short to positive, or an interrupted resistor track. The gauge sticks at one end and a substitute value is used.
Written from public technical sources and not yet checked by a mechanic. How we write these pages
Symptoms
- Fuel gauge wrong, stuck or jumping
- Range display and low-fuel warning wrong
- Check engine light (depending on the maker)
Common causes
- Signal or ground wire open, or tank unit connector off Most likely
- Resistor track interrupted or worn (sulphur deposits, wiper lifting) Most likely
- Corroded connector or pushed-back pin Possible
- Signal wire shorted to positive Less likely
How to diagnose P0463
- Check the connector on top of the fuel tank unit (often under the rear seat or an access panel) for corrosion or a loose pin.
- Measure the sending unit's resistance at empty and full against the manual's values.
- Check the signal wire between the tank and the instrument cluster for an open circuit.
- If the sending unit is bad, replace it. On many cars it's part of the fuel pump module.
Vehicles that report P0463 most
| Vehicle | Years | Reports | Share | Median miles |
|---|---|---|---|---|
| Nissan Xterra | 2005–2007 | 105 | 62k | |
| Nissan Frontier | 2005–2007 | 47 | 55k | |
| Nissan Pathfinder | 2005–2008 | 35 | 59k | |
| Ram 1500 | 2014–2017 | 20 | 56k | |
| Chevrolet Malibu | 2005–2007 | 8 | 85k | |
| Hyundai Santa FE | 2007–2009 | 7 | 71k | |
| GMC Envoy | 1996–2006 | 5 | 76k | |
| Nissan Murano | 2005–2007 | 3 | — |
Counts of owner complaints to the NHTSA that mention P0463 (247 in total), not failure rates: popular models get more complaints simply because more of them are on the road. Models with fewer than 3 complaints are left out.
Reading the code
- P
- Powertrain
- 0
- Generic (SAE) code
- 4
- Auxiliary emission controls
- 63
- Specific fault
Questions drivers ask
Can I drive with code P0463?
Yes, but don't trust the fuel gauge. Track your mileage and refuel early so you don't run out.
Will my car pass an emissions inspection with P0463?
Probably not in states that test vehicles with an OBD-II scan: an emissions-related code that keeps the check engine light on is usually an automatic fail. Rules differ by state and county, so check yours.
Will P0463 clear by itself?
The light can go off after several drive cycles without the fault, but the code returns if the cause is still there. After a repair, the readiness monitors need a full drive cycle before an inspection.
Often reported together
Codes that owners mention in the same NHTSA complaints as P0463. They can point to a shared cause, so it's worth checking them together.
- P0464Fuel Level Sensor A Circuit Intermittent5 complaints
- P2068Fuel Level Sensor B Circuit High4 complaints
This page is general information, not a substitute for a professional diagnosis. Repair costs are rough estimates for parts and labor and vary by vehicle and region.