P0455 – EVAP System Large Leak Detected

Description

The ECM detects a large leak in the EVAP system, often caused by a loose or damaged gas cap.

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Symptoms

Check engine light
Fuel smell
Poor emissions
Rough idle

Causes

Loose gas cap
Cracked EVAP hose
Faulty purge valve
Faulty vent valve

Diagnosis

Smoke test EVAP
Inspect hoses
Test purge valve
Test vent valve

Repair

Tighten/replace gas cap
Repair hoses
Replace purge or vent valve