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Hooked up my scanner to the OBDII port and came up with the P0456 code. Truck has 199,000 miles. Any idea on what it could be? In 199,000 miles the truck has never seen a single CEL since it was brand new. This is the first code it has ever gotten in its 13 years with no change in parts.

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That would be a small evap leak. Could be a leaky gas cap. Could be an evap line or a whole host of things related to the vapor system of your truck. You can have your evap system smoke tested to see exactly where the smoke comes out so you know what to replace and have it fixed right. If your a betting man, throw a new gas cap at it as they don't cost alot, clear the code and see if that fixes it. I would get the cap from Toyota as their parts are superior to parts store parts and you know it will fit right the first time. Hope this helps.

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Did you forget to tighten down the gas cap when you filled up?
 
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