P0455 Ford Maverick
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 Maverick 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 Maverick.
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 Maverick.
Common Causes on Ford Maverick
- Gas cap missing or not sealing at all
- EVAP purge valve stuck open
- Large EVAP vapor line disconnect
- Charcoal canister vent valve stuck open
- Fuel filler neck seal completely failed
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 Maverick
Maverick P0455 is typically a straightforward gas cap or stuck-open valve issue. Diagnosis is quick with a smoke test.