P0455 Ford F-150
EVAP System Leak Detected (Gross Leak) · Powertrain Code · Medium · Repair: Easy
What is P0455?
A large leak has been detected in the EVAP system. Check gas cap first — if secure, look for disconnected or cracked EVAP hoses, a stuck-open purge valve, or a leaking charcoal canister.
When the Ford F-150 triggers code P0455 (evap system leak detected (gross leak)), it typically points to an issue in the powertrain system. Below you'll find the most common causes, symptoms, and repair options specific to the Ford F-150.
This repair is rated easy, meaning basic tools, no lift needed.
Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your Ford F-150.
Common Causes on Ford F-150
- Gas cap missing or not engaging at all
- EVAP canister vent solenoid stuck wide open
- Large crack or disconnect in EVAP hose routing
- Fuel tank seal leak at fuel pump assembly
- Charcoal canister housing cracked from impact
Symptoms
- Check engine light illuminated
- Noticeable fuel smell near vehicle
- Gas cap warning light on dashboard
- Failed emissions test
- Fuel economy noticeably decreased
Notes for Ford F-150
F-150 EVAP canister vent solenoid stuck open is the most common cause after a missing gas cap. Located near the charcoal canister at the rear.