Ford code
P0456: on a Ford
How much to fix P0456 on a Ford? Typically $110 to $330 for evap vent valve replacement, the most common fix. This is an estimate, not a quote.
Many Fords use a capless filler with a spring door, so there is no cap to tighten. When P0456 appears, the seal in the filler neck or a vapor valve is often the first place to look.
General meaning of P0456: After the car is shut off, the computer seals the fuel-vapor system and checks whether pressure holds. This code means it leaks down very slowly, about as much as a hole the size of a pin. Because the leak is tiny, it is the slowest of the vapor codes to track down. See the full P0456 page.
Models to know about
| Model | Years | What to know |
|---|---|---|
| F-150 | 2009 to 2020 | Capless filler in newer trucks. |
| Escape | 2008 to 2019 | Fuel filler and vapor valve. |
| Fusion | 2010 to 2019 | Capless Easy Fuel on many years. |
| Explorer | 2011 to 2019 | Evaporative canister area. |
Common causes on a Ford
- Capless filler that is dirty or damaged.
- Fuel tank pressure sensor reading off.
- Canister vent valve stuck partly open.
- Cracked vapor hose at the canister.
NHTSA's public complaint file shows how owners describe this kind of trouble: the 2013 Ford Fusion has 1,957 complaints on file, and 105 of them use wording like EVAP, evaporative, fuel vapor, P0456. Complaints are owner reports, not proof of a cause.
Check this first
- Check the filler door for debris. A fuel funnel can wear the seal.
- Ask for a smoke test.
- Check for any vapor system recalls on your VIN.
How this range is built
| Part of the job | Low | High |
|---|---|---|
| Parts | $35 | $130 |
| Labor: 0.7 to 1.2 hours × $110 to $150 an hour | $77 | $180 |
| Fees: shop supplies, disposal, diagnostics | $0 | $20 |
| Total, rounded | $110 | $330 |
The hourly rate is the BLS Occupational Employment and Wage Statistics, May 2025 average pay for this trade in the US, $27.13 an hour, times 4 to 5.5 to cover what a shop bills (overhead, tools, insurance, profit). Parts are a band from budget aftermarket to the manufacturer part. Full method.
Not a repair shop, estimates only. Typical range, estimate. Not a quote. Your car, parts and shop change the number.
The canister vent parts are moderate in cost. A tank pressure sensor is a small part.
Other repairs that may be involved
| Repair | Typical range, US |
|---|---|
| EVAP vent valve replacement | $110 to $330 |
| EVAP purge valve replacement | $80 to $240 |
| Gas cap replacement | $5 to $95 |
Questions to ask the shop
- Is it the filler or the canister side?
- Was a smoke test used?
- What is the part warranty?
Got a quote already? Check it against the range. Wondering if a recall touches this problem? See Ford recalls by model or check a VIN.
P0456 on a Ford: questions
Do I need a new gas cap on a Ford?
Not if your car has the capless filler.
Will it clear on its own?
Sometimes after a few drive cycles, but if the cause is real it returns.
How much does it cost to fix P0456 on a Ford?
The most common fix, evap vent valve replacement, has a typical range of $110 to $330 across the US. That is an estimate built from parts prices and local labor wages, not a quote. Your model, engine and shop move it.
P0456 on other makes
Sources
Written from public NHTSA data, owner-reported patterns and general repair knowledge, in our own words. Model lists are examples, not a full list, and patterns are not a diagnosis. Prices updated October 2026. Not a repair shop, estimates only.