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P0455 fault code: what it means

P0455: Large leak in the EVAP system, or no purge flow. Smell of fuel possible.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

  1. missing or badly fitted fuel cap
  2. disconnected or split EVAP hose
  3. cracked charcoal canister
  4. purge or vent valve stuck open

P0455 by make

Audi

EVAP system large leak. Check the fuel cap first.

Usual causes: loose, missing or bad fuel cap; leaking EVAP hose or canister; purge valve fitted backwards

BMW

Large evaporative (fuel vapour) leak. BMW tests the system with a DMTL leak-check pump.

Usual causes: fuel cap loose or seal worn; split EVAP hose; DMTL leak-check pump fault; purge valve leaking

Haval

Large EVAP leak detected.

Usual causes: loose or faulty fuel cap; cracked EVAP hose; purge valve

Hyundai

EVAP large leak detected.

Usual causes: purge control solenoid valve stuck open; loose, missing or faulty fuel cap; faulty canister close valve or leak detection sensor; disconnected EVAP hose

Jeep

Large evaporative emission leak detected.

Usual causes: loose or faulty fuel cap; cracked EVAP hose; faulty purge valve or leak detection pump/ESIM

Kia

EVAP large leak detected.

Usual causes: canister close valve stuck open (Rio TSB); loose or faulty fuel cap; purge control solenoid stuck open; cracked or disconnected EVAP hose

Lexus

EVAP system large leak detected: the fuel vapour system will not hold vacuum during its self-test.

Usual causes: loose or faulty fuel cap; failed canister vent valve; cracked EVAP hose or filler neck; cracked charcoal canister

Mercedes-Benz

Large EVAP (fuel vapour) leak detected.

Usual causes: loose or faulty fuel cap; split EVAP line; stuck purge or vent valve

MG

Large EVAP leak detected.

Usual causes: loose or faulty fuel cap; cracked EVAP hose; purge valve

Mini

Large evaporative (fuel vapour) leak.

Usual causes: fuel cap loose or seal worn; split EVAP hose; leak-check pump fault; purge valve leaking

Mitsubishi

Large leak in the fuel vapour (evap) system.

Usual causes: fuel cap missing or loose; split evap hose; purge valve stuck open

Nissan

EVAP system large leak. On Nissans the canister vent control valve is a common failure.

Usual causes: EVAP vent control valve stuck open or O-ring leaking; loose or faulty fuel cap; EVAP hose or canister leak; purge valve fault

Skoda

EVAP system large leak. Check the fuel cap first.

Usual causes: loose, missing or bad fuel cap; leaking EVAP hose or canister; purge valve fitted backwards

Subaru

Large leak in the fuel vapour (evap) system.

Usual causes: fuel cap missing, loose or worn seal; purge valve stuck open; split evap hose or canister leak; rusted fuel filler neck

Toyota

EVAP system large leak detected: the fuel vapour system will not hold vacuum during its self-test.

Usual causes: loose or faulty fuel cap; failed canister vent valve; rusted or cracked fuel filler neck/hose; cracked charcoal canister (exposed on Hilux/utes)

Volkswagen

EVAP system large leak. Check the fuel cap first.

Usual causes: loose, missing or bad fuel cap; leaking EVAP hose or canister; purge valve fitted backwards

Volvo

Large EVAP leak detected.

Usual causes: loose or faulty fuel cap; cracked EVAP hose; purge valve

What the repair usually costs

Not sure what P0455 means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.