What usually causes it
- A gas cap with a worn seal
- A tiny crack in a hose, line or the filler pipe
- A leaking purge or vent valve
- A small leak at the fuel tank or the charcoal canister (the box that stores the fumes)
P0456Starts at: OK to drive, fix when convenient
Fuel vapor system has a very small leak
The EVAP system traps gas fumes from the fuel tank so they do not escape into the air. The computer found a very small leak in it.
Check this first
Tighten the gas cap until it clicks, and check the cap seal for cracks. The light can take a few days of driving to turn off.
What to watch for
- A strong smell of gas
- Fuel dripping under the car
- Trouble filling the tank
Can I keep driving?
We rate P0456 as OK to drive, fix when convenient, as a starting point. Keep an eye on the signs below. If the light starts flashing, stop driving soon.
Quick answers about P0456
What does P0456 mean?
Fuel vapor system has a very small leak. The EVAP system traps gas fumes from the fuel tank so they do not escape into the air. The computer found a very small leak in it.
Can I keep driving with P0456?
We rate P0456 as OK to drive, fix when convenient, as a starting point. Keep an eye on the signs below. If the light starts flashing, stop driving soon.
What usually causes P0456?
The most common causes, in order: A gas cap with a worn seal; A tiny crack in a hose, line or the filler pipe; A leaking purge or vent valve; A small leak at the fuel tank or the charcoal canister (the box that stores the fumes).
Estimates only. A mechanic should confirm. The same code can mean slightly different things on different cars; the app explains it for your exact year, make, model and mileage.