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brownjeff, ASE Certified Technician
Category: Car
Satisfied Customers: 13886
Experience:  17 years experience, ASE certified, dealership certified, Service Manager for 15 years,
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What is diagnostic code P0456?

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What is diagnostic code P0456?
Submitted: 6 years ago.
Category: Car
Expert:  brownjeff replied 6 years ago.
That code is for a vapor leak in the fuel system. It can be cause by a loose or not dealing gas cap. Also several rubber lines going to the fuel tank so make sure none of these have a crack in them. It is a vapor leak so anything that will allow the pressure out of the tank will set off the code. It will not effect the way the car runs.
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