P0455Low urgency
Evaporative Emission System Large Leak Detected
Emission · EVAP System
✅ Vehicle is driveable — check gas cap first, then book service.
What this means
A large evaporative emissions leak has been detected. Start by tightening your gas cap and clearing the code. If it returns, a smoke test will quickly locate the source.
Likely causes
- Loose, missing, or cracked gas capMost common
- Cracked EVAP canisterCommon
- Split EVAP vent hoseCommon
- Faulty purge control valveLess common
Estimated repair cost
Gas cap replacement$10 – $35
EVAP canister replacement$150 – $400
Smoke test diagnostic$75 – $150
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Frequently asked questions
What does P0455 mean?
A large evaporative emissions leak has been detected. Start by tightening your gas cap and clearing the code. If it returns, a smoke test will quickly locate the source.
Is P0455 serious?
Vehicle is driveable — check gas cap first, then book service.
How much does it cost to fix P0455?
Repair costs for P0455 range from $10 – $35 depending on the root cause and your vehicle.
Can I drive with P0455?
Yes, the vehicle is safe to drive. Schedule a repair at your convenience.