P0455 on Ford Vehicles: EVAP System Leak Detected (Large Leak)
The fuel vapor system can't hold vacuum at all — check the gas cap first, then hoses and valves. P0455 →
6Complaints mentioning the code
#2Rank among 13 brands
0.2%Share of Ford DTC complaints
In NHTSA owner complaints we analyzed for Ford, P0455 was mentioned 6 times.
Notes by brand
On Fords with the capless Easy Fuel filler, a dirty or damaged filler flap can let the system leak like a missing cap. Clean the flap area before replacing EVAP components.
Most mentioned models
| Ford Fusion | 2 | |
|---|---|---|
| Ford Fusion Hybrid | 2 | |
| Ford Escape Hev | 1 | |
| Ford Escape Hybrid | 1 |
Model years mentioned
Components named in these complaints
- Fuel/propulsion System (6)
- Power Train (2)
- Engine (2)
- Vehicle Speed Control (1)
Often appears together with
P0457
Powertrain
The EVAP leak test found the system wide open — almost always a loose, missing or worn gas cap.
Minor
P2112
Powertrain
The PCM asked the throttle to open, but it stayed shut – the engine can't get air, so it bogs…
High
P2119
Powertrain
The throttle plate isn't reaching the position the PCM commands, or won't spring back to its…
Moderate
Possible causes
- Gas cap loose, missing, the wrong type or with a failed seal
- Canister vent valve stuck open from dirt, water or corrosion
- EVAP hose or filler-neck vent line disconnected or cracked through
- Purge valve stuck closed or purge line blocked (engine-running tests); stuck open on engine-off pump tests
Related codes
Source: NHTSA Complaints API (US government open data), analyzed by DTC mention.