⚡ AUTO CODE FIX
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EmissionsMinor✅ DIY Friendly

P0455

Evaporative Emission Control System Large Leak Detected

A large leak has been detected in the EVAP system.

SeverityMinor
CategoryEmissions
Est. Repair Cost$20–$400
Code TypePowertrain
DIY RepairYes

⚡ Common Causes

⚠️ Symptoms

✅ How to Fix — Step by Step

  • Step 1:Check fuel cap first
  • Step 2:Inspect all EVAP lines for disconnection or large cracks
  • Step 3:Smoke test the EVAP system
  • Step 4:Replace purge or vent valve if stuck open
💡 Pro Tip: P0455 large leak is often a completely missing or cracked fuel cap — start there every time.

Repair Cost Estimate

Full Repair Estimate
$20–$400
DIY Possible?
YES
Severity
Minor

Frequently Asked Questions

What does OBD2 code P0455 mean?+
P0455 stands for Evaporative Emission Control System Large Leak Detected. A large leak has been detected in the EVAP system.
What causes code P0455?+
Missing or loose fuel cap; Large crack in EVAP hose; Disconnected EVAP line; Faulty purge or vent valve stuck open; Damaged charcoal canister
How do I fix code P0455?+
Check fuel cap first; Inspect all EVAP lines for disconnection or large cracks; Smoke test the EVAP system; Replace purge or vent valve if stuck open
How much does it cost to fix P0455?+
Estimated repair cost for P0455 is $20–$400.
Is P0455 DIY-friendly?+
Yes — P0455 is generally DIY-friendly with basic tools.

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