P0455 Toyota Corolla
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 Corolla 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 Corolla.
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 Corolla.
Common Causes on Toyota Corolla
- Gas cap missing or not clicking into place
- Charcoal canister housing cracked open
- EVAP VSV (vacuum switching valve) stuck wide open
- Large EVAP vapor hose disconnected or split
- Fuel tank overfill check valve stuck open
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 Corolla
Toyota charcoal canister cracking is a known cause of P0455 on older Camry and Corolla models. The canister is near the fuel tank.