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P0455 Large leak in the fuel vapour (EVAP) system

Generic SAE definitionEvaporative emission system leak detected (large leak)

Safe to driveNormal driving is fine. Book it in when it suits you; it won't hurt anything in the meantime.

Check this first

Check the fuel cap first – if it's missing or loose, tighten it and see if the light goes out.

It won't hurt the engine, but it will fail an emissions test.

What usually fixes it

In the order a good shop checks them. Typical total: $36–$362 at $130 an hour.

  1. Fuel cap

    $36–$78

    Missing, cross-threaded or a perished seal.

  2. EVAP hose

    $119–$282

    A hose knocked loose or split, often near the tank.

  3. Vent valve

    $144–$362

    Stuck open, usually from dirt or corrosion.

Code titles are the generic SAE definitions. Prices are typical US parts and labor for a common car or light truck – a guide for judging a quote, not a quote. Always confirm a repair against the vehicle in front of you.

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See what your vehicle says about P0455

A stored code is a headline, not the story. The vehicle also holds the conditions from the moment the code set, how close each part is to the limit it fails at, what the fuel trims are doing, and whether the fault is still happening. Drive DTC reads all of it with a USB adapter and a Windows PC – read-only by design.

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More in Emissions

All 12 codes in this group
P0442Evaporative emission system leak detected (small leak) P0443Evaporative emission system purge control valve circuit P0446Evaporative emission system vent control circuit P0456Evaporative emission system leak detected (very small leak) P0457Evaporative emission system leak detected (fuel cap loose/off) P0460Fuel level sensor A circuit