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P0440Cars & SUVs
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P0440 — EVAP system malfunction

A general fault is detected in the evaporative emissions (EVAP) system. Big temperature swings can crack hoses and set this code.

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Likely causes

  • Gas cap loose or defective
  • Cracked or disconnected EVAP hoses
  • Faulty purge valve or charcoal canister

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Recommended checks

  1. 1

    Check the gas cap and system sealing first

  2. 2

    Visually inspect and pressure-test all EVAP hoses

  3. 3

    Test the purge valve and replace the canister if saturated

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Parts to replace