P0455

Evaporative Emission System Leak Detected (Large Leak)

Severity: Low Emission Control Generic OBD-II Code Est. Repair: $20 - $300

Usually safe to drive short-term, but diagnose soon.

Quick Answer

P0455 means “Evaporative Emission System Leak Detected (Large Leak).” Severity: Low. Estimated repair cost: $20 - $300. Most common sign: CEL.

What Does P0455 Mean?

Large EVAP leak detected — most often a loose, missing, or damaged gas cap.

Common Symptoms

CEL
Usually no drivability issue
Possible faint fuel odor

Possible Causes

Loose/missing/faulty gas cap
Cracked EVAP hose
Faulty purge or vent valve
Damaged canister
Fuel tank/filler neck leak

How to Fix P0455 – Repair Guide

Tighten or replace gas cap and clear code
Inspect EVAP lines
Smoke-test if code returns
Test solenoids
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Budgeting for This Repair?

A typical P0455 repair runs about $20 - $300. If you'd rather spread the cost over time, estimate the payment with our free sister tool: Car Finance Calculator (50-state sales tax, trade-in equity, full amortization).

Recommended OBD2 Scanners & Tools

To read and clear this code yourself, you need a reliable OBD2 scanner. Here are top-rated options:

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ANCEL AD310 Classic Enhanced OBD2 Scanner

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FIXD Bluetooth OBD2 Scanner

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Disclaimer: Information is for educational reference only and does not replace professional diagnosis. Actual causes and costs vary by vehicle make, model, year and condition. Always verify with a qualified technician.