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Code dictionary Generic OBD-II

P0455EVAP System Leak Detected - Large Leak

This is a definition, not a repair instruction. It does not identify a failed part or establish that a vehicle is safe to drive.

Powertrain Community code reference

Reference scope

Generic OBD-II definition.

A manufacturer label does not establish the model, year, engine or module to which a diagnosis applies. Read the safety and diagnostic limits.

Separately researched

Vehicle-specific diagnosis

These guides address the exact vehicles and conditions in their sources. Select the guide that matches your vehicle.

Dodge

2022 Dodge Challenger P0456 or P0455: choose the correct EVAP bulletin

Compare the EZH, EZC and ESG engine bulletins, understand the manual-transmission completion step, and separate a software case from a demonstrated leak.

Nissan

2018 Nissan Rogue P0456: a loose cap or a real EVAP leak?

Separate the dashboard cap message, stored leak codes and a measured leak before replacing parts.

Definition source

  1. Community reference dataWal33D (Waleed Judah)
    DTC Database: pinned community code definitions

    Source checked · MIT

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