P0455 Ford Ranger
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 Ranger 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 Ranger.
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 Ranger.
Common Causes on Ford Ranger
- Gas cap missing or damaged beyond sealing
- EVAP canister vent valve stuck open
- EVAP vapor line severed or crushed from off-road undercarriage impact
- Charcoal canister cracked from trail damage
- Fuel tank vapor connector pulled loose from vibration
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 Ranger
Ranger models used off-road frequently develop large EVAP leaks from undercarriage damage. Inspect vapor lines and canister after trail use.