P0455 Evaporative Emission Control System Leak Detected (Gross Leak)
If you have a P0455 Evaporative Emission Control System Leak Detected (Gross Leak), first check to make sure the gas cap is installed and torqued properly.
The Evaporative Emissions system has applied a vacuum to the fuel system and detected a major leak. This is usually a sign that you’ve left the gas cap off, or that the gas cap is not sealing properly against the neck of the filler tube.
First, check the gas cap to make sure it’s tight. If it is, remove the cap and check the condition of the “O” ring seal and the neck of the filler tube. If the gas cap “O” ring is worn or damaged, replace it. Some car makers sell the “O” ring, but most make you buy a new gas cap. If you’re close to a dealer, buy it from them rather than a generic one from the parts store. You’ll have better luck over the long haul with an OEM part.
If that doesn’t fix the problem you may have a leak in one of the EVAP hoses. Read this post to understand how the EVAP system works.
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© 2012 Rick MuscoplatPosted on by Rick Muscoplat