P0455

What it means

This means your car's computer has found a significant leak in the system designed to capture fuel vapors, often indicating a loose gas cap or a larger crack in a hose.

Is it safe to drive?

While generally safe to drive, a large EVAP leak releases harmful fuel vapors into the atmosphere and can slightly impact fuel economy. It's best to address it promptly.

Most likely causes

• Loose, missing, or faulty gas cap

  high

  This is the most common and easiest fix; check the gas cap for proper sealing and tightness.

• Cracked or disconnected EVAP hose

  medium

  Inspect all visible EVAP hoses for cracks, breaks, or disconnections, especially near the fuel tank and engine.

• Faulty EVAP purge valve or vent valve

  medium

  These valves control vapor flow; a stuck-open valve can cause a large leak.

• Cracked charcoal canister

  low

  The canister stores fuel vapors; physical damage can lead to a large leak.

Related help

• Full P0455 diagnosis, causes & costs
• How to read check engine light codes
• Is it safe to drive with the light on?