|I have my 03 2500 hd, 6.0, it threw a evap code p0455.
what should i look at first? gas cap? i havenot done anything to it latly like the filter ect, just put gas in it and changed the oil.
it came on about 1 week ago, i reset it, it poped on again today.
i run super gas, i run dry gas all winter, lucas injector cleaner every other fill.
so i dont think its **** from the new gas stuff.
any ideas to look at?
thanks in advance.

 

I'd check the gas cap, make sure it's on good and tight.
If that doesn't fix it, check the evap solenoid under the hood, see if the hose hooked up to it has come off. Follow the hose as best as you can back towards the gas tank, looking for cracks and to see if it came unhooked underneath.

 

cool, i did check the cap, its tight, it could be the cap is no good.
the truck is an 03, but it has high miles so maybe she needs a new cap

 

I recall someone having that problem from overfilling/topping off their tank. Something about backing gas up into some part of the evap system.

 

hmmm, that could be, i always top it off. how do i fix that?

 

Sorry...I don't recall what the remedy was. Some days I'm no good for