P0455: Evaporative Emission Control System Leak Detected — Gross Leak / No Purge Flow
System: EVAP · Priority: low
What P0455 means
The control module detected a condition matching the generic definition Evaporative Emission Control System Leak Detected — Gross Leak / No Purge Flow. A trouble code identifies what the module detected; it does not automatically identify the failed part.
Useful next checks
- Check for a loose/missing fuel cap or disconnected EVAP hose.
- Inspect purge and vent valve operation.
- Smoke-test the system if no obvious leak is found.
Why vehicle context matters
The same generic code can have different diagnostic paths depending on engine, calibration, wiring layout, service bulletins and related codes. Freeze-frame and live data can help establish when the fault occurred.
Need a scanner for P0455?
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