P0455 Toyota Tacoma
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 Toyota Tacoma 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 Toyota Tacoma.
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 Toyota Tacoma.
Common Causes on Toyota Tacoma
- Gas cap missing or severely worn from off-road use
- Charcoal canister cracked from undercarriage impact
- EVAP VSV valve stuck open
- EVAP vapor line severed from trail obstacle contact
- Fuel tank vent hose disconnected 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 Toyota Tacoma
Tacoma, 4Runner, and Tundra used off-road frequently develop large EVAP leaks from canister and line damage. Inspect after trail use.