TruckCodeLookup

Sign in
P0455Cars & SUVs
Easy

P0455 — EVAP system large leak detected

A large leak is detected in the evaporative emissions system. Often a gas cap left loose after fueling or a disconnected hose.

Ad — development mode

320 × 50 — Mobile

Google AdSense

Likely causes

  • Missing, loose, or worn gas cap seal
  • Disconnected EVAP hose or cracked charcoal canister
  • Purge valve stuck open letting in air

Ad — development mode

320 × 50 — Mobile

Google AdSense

Recommended checks

  1. 1

    Check the gas cap first (most common cause)

  2. 2

    Smoke-test the complete EVAP system

  3. 3

    Replace the components that fail the test

Ad — development mode

320 × 50 — Mobile

Google AdSense

Parts to replace