P0464Fuel Level Sensor A Circuit Intermittent
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car 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. At GM, P0464 is a by-product of the engine-off EVAP leak test: a jump in fuel level with the vent valve closed counts as possible refuelling and aborts the test; if a following check finds no real refuelling, the jump is counted as an intermittent sensor signal (change above 10 % not stable for 30 s, 2 of 3 samples). GM sets the code with MIL on the first trip, because otherwise the leak monitor would be defeated permanently. Ford does not use P0464 and reports jumps as P0461.
- What you may notice
- Check engine light on (GM after one trip)
- Fuel gauge occasionally jumps
- EVAP readiness not set
- Likely causes
- LikelyLoose contact or corrosion at the tank connector or sensor terminal
- LikelyWorn spots on the resistor track (wiper skipping)
- PossibleChafed wire with intermittent contact
- RareCar parked on a steep slope or fuel sloshing after switch-off
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.