P0455
Get Serviced SoonFix: Medium — get serviced in 1–2 weeksEVAP System Leak Detected (Large Leak) — A significant leak in the EVAP system.
Dashboard light triggered
Check Engine LightWhat to do
Check gas cap first. If secure, have the EVAP system smoke-tested. A disconnected or cracked hose is common.
Common causes
- Loose or missing gas cap
- Disconnected or cracked EVAP hose
- Faulty purge valve
- Damaged charcoal canister
Estimated repair cost
$50–$400
Exact cost depends on the cause, your vehicle, and labor rates in your area.
What to tell your mechanic
Use this script so you sound informed and get a clear diagnosis before agreeing to repairs:
“Code P0455, EVAP large leak. Can you smoke-test the EVAP system and locate the leak? I've checked the gas cap.”
About the Check Engine Light
Code P0455 triggers the Check Engine Light. Indicates an issue with the engine or emissions system. Could range from a loose gas cap to a serious engine misfire.
Read full Check Engine Light guideFrequently asked questions
- What does OBD code P0455 mean?
- EVAP System Leak Detected (Large Leak) — A significant leak in the EVAP system.
- What dashboard light does P0455 trigger?
- P0455 triggers the Check Engine Light.
- How serious is P0455?
- Severity: yellow. Fix priority: Medium — get serviced in 1–2 weeks.
- How much does it cost to fix P0455?
- Repair costs typically range from $50–$400. The exact cost depends on the root cause and your vehicle.
Related OBD codes (same dashboard light)
These codes also trigger the Check Engine Light: