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. More significant than P0442 but still not an immediate safety concern. Start by tightening your gas cap and clearing the code. If it returns, a smoke test by a mechanic 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
🏪
Sponsored · Local Shop
Find shops near you specializing in this repair
Get quotes from certified mechanics · Free estimates
📦
Sponsored · Parts
Top-rated parts for this repair
Direct-fit · Same-day shipping · 4.7★ average rating

Frequently asked questions

What does P0455 mean?

A large evaporative emissions leak has been detected. More significant than P0442 but still not an immediate safety concern. Start by tightening your gas cap and clearing the code. If it returns, a smoke test by a mechanic 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.