Technical Definition:

Evaporative Emission System Leak Detected (gross leak/no flow)

Trouble Code: P0455
Address: 0x0455
System: Powertrain
Technical Description:

Possible Causes:
  • A loose or improperly affixed gas cap
  • A non-conforming gas cap (i.e. not factory/original brand)
  • Other leak or damaged piece in EVAP system

Possible Symptoms:

Evaporative Emission Control System Leak Detected Gross Leak

Possible Solutions:
  • Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
  • Otherwise, replace the gas cap, and/or
  • Inspect the EVAP system for cuts/holes in tubes/hoses (you may hear a vacuum noise or smell fuel), repair if necessary

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Missing or loose fuel cap
– Incorrect fuel filler cap used
– Fuel filler cap remains open or fails to close
– Foreign matter caught in fuel filler cap
– EVAP canister or fuel tank leaks
– EVAP system hose leaking
– Fuel tank leaking

Specific Makes:

– Possible a noticeable fuel odor caused by the release of fuel vapors

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