Code Definition

P0455 — Evaporative Emission Control System Leak Detected (gross leak)

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0455

P0455 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0455 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The evaporative emission control system captures fuel vapour from the tank in a charcoal canister and later draws it into the engine to be burned, and the Engine Control Module periodically tests the sealed system for leaks by applying either engine vacuum or a small positive pressure and monitoring how well the system holds. DTC P0455 sets when that monitor detects a leak equivalent to an opening of roughly 1.0 mm or larger, which is classed as a gross leak and is typically caused by a component that is disconnected, split, or held open rather than by a small porosity leak. During the test th...

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