Question about Jeep Grand Cherokee

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I got a code of PO455 can you explain to me what that actually is??

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P0455 is a Large Evaporative System Leak. Usually caused by a loose gas cap. If the cap WAS loose, tighten it up and just drive the car, it may take a few days for the computer to run the tests and and confirm that its OK and will turn the light off by itself. If the cap is tight, then make sure the seal is good, if it is, then the leak is somewhere else, usually on Jeeps I find hoses cracked near the canister, so thats where to start if the gas cap is tight and good.

Posted on Aug 30, 2010

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PO455 sets when the computer is unable to apply and hold a vacuum to the EVAP system. The EVAP systems job is not to let fuel vapors escape the fuel tank into the atmosphere. Because of pressure changes the tank still needs to vent vapors that build up so the system opens valves that are controlled by the computer and release these vapors into a charcoal filled canister. Easy self done checks is too make sure the fuel cap seal is in good condition no tears or cracks, check for broken missing vacuum lines for the EVAP system. Hope this gave you the information you were looking for.

Posted on Aug 30, 2010

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