P0455
EVAP System Large Leak Detected
low
i Description
A large leak has been detected in the EVAP system. The leak is equivalent to a 0.080-inch (2mm) hole or larger. The most common cause is simply a loose or missing fuel cap.
? Common Causes
- Loose or missing fuel cap
- Disconnected EVAP hose
- Cracked charcoal canister
- Missing or damaged EVAP component
- Fuel filler neck crack
! Symptoms
- Check engine light
- Fuel smell near vehicle
- Failed emissions test
# Diagnostic Steps
- Check fuel cap — is it present, tight, and not cracked?
- Inspect all EVAP hoses visually for disconnections
- Smoke-test EVAP system
- Check charcoal canister for damage
⚙ Typical Fix
Tighten or replace the fuel cap. Reconnect any disconnected EVAP hose.
Parts Needed
Fuel cap
Estimated Cost
$10-$300
↔ Related Codes
Q Frequently Asked Questions
Yes. Check your fuel cap first — this solves the problem more than half the time. The code may take a few drive cycles to clear after tightening the cap.
Absolutely. Check and tighten the fuel cap. If it is worn, replace it ($10-$20). If the code persists, a visual inspection of EVAP hoses may reveal a disconnected line.
Fuel cap: $10-$20. If it is something else, a smoke test ($80-$120) will find the leak, and the repair is usually $50-$200.
☞ Learn More
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