Question about 2005 Chevrolet Cobalt

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How to fix code po455 on 2005 cobalt - 2005 Chevrolet Cobalt

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I researched this and found the following information. Hope it helps: P0455 means a gross leak detected in the Evaporative Emissions System. Some call this a "gas cap" code, because the most common cause a loose or failed gas cap. But it could be caused by any vapor leak in the fuel tank, filler neck, or anywhere else in the vapor management system. If it isn't a gas cap, you will need tol take it someplace where they have a smoke machine that can find the leak using smoke.

Posted on May 09, 2014

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If you cant find a leak i suggest you test the voltage on your fuel pump relay. When the relay isnt operating normally it will throw a false leak code. Yoi would need to replace the relay.

Posted on Jun 04, 2016

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