Here’s a pretty good video on diagnosing these leaks from Scotty Kilmer, if you are interested: (2) They’ll use a scan tool to confirm that the EVAP vent solenoids and valves are operating correctly. After the checks and fixes listed above, the mechanic will perform two tests: (1) A smoke test (using a smoke machine).The fuel tank pressure will be checked and monitored.The mechanic will inspect the gas cap to ensure it can handle pressure if you are getting a warning that your gas cap is off, even when it’s on, replacing it will more than likely clear this code.This includes the purge valve, line, and canister. After ascertaining what trouble codes appear with the P0455, the mechanic will typically inspect the EVAP system.Additional trouble codes provide clues to the problem. The mechanic will typically check to see if there are any other trouble codes.You’re looking for the smell of fuel.Ī mechanic has a wide range of instruments to aid in diagnosing the p0455 code in your Chevy Cobalt. Smell around the gas cap, fuel filler neck, EVAP hoses, and anywhere else you can safely get your head. This video is a fantastic resource on how to test your gas cap. Check the seal on your Cobalt’s gas cap.Inspect the EVAP system hoses for a leak.When the fuel filler neck gasket dries out, the fuel tank can’t hold pressure anymore.īefore sending your Cobalt off for a thorough evaluation, you can do a few things. This gasket can dry out, especially with vehicles that spend their time in dry climates. Fuel Filler Neck– There is often a gasket where the fuel filler neck connects with the gas tank. If you are getting that message, plus a P0455, it may save you a ton of time and money to replace the fuel cap and see if it goes away. Often, you’ll get a message informing you that the fuel cap is off even when it is on.
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