Severity: Low
Safe to drive. Schedule a diagnosis soon.
What P0455 means
The EVAP system found a large leak. The most common cause is a fuel cap left loose or off.
Symptoms
- Fuel smell
- Check engine light after refueling
Common causes
Most likely first
- 1Fuel cap loose, missing or wrong cap
- 2Disconnected or cracked EVAP hose
- 3Vent valve stuck open
- 4Damaged charcoal canister
How we diagnose it
- Check the fuel cap first
- Smoke test
- Test vent valve operation
Every vehicle sets codes under its own conditions. We check the factory diagnostic steps and service bulletins for your VIN, so the repair targets the actual cause.