I've got a 2001 Ram 1500 with a code P0455( EVAP Leak). My question is whyat is it and where do I need to look? Also, where can I find a option list per my serial#?

 

It sounds like the EVAP canister (big black thing) mounted on the drivers side frame rail. To get the option list go to the dealer with your vin#.

 

Cool beans, will have to check that. Usually I gut all that crap when I buy a late model, but can't cuase of the ECM. Used to be one here awhile but but moved and my account got deleted for some reason. Thanks again.

 

i started with a P0442 (minor leak) and after replacing the gas cap now have a P0455 (major leak).

your problem is a leak somewhere in the evap system. it could be gas cap, vac line, canister, or purge solenoid on passenger side inner fender.

an interesting test that i did was to fill up the gas tank, reset the pcm to turn off the CEL code, and then put the gas cap inside a quart zip lock plastic bag, and then gently replace the gas cap being careful not to tear the plastic. this seals the tank and prevents a gas cap leak. my CEL was coming on with a 2-3 days of a reset, but with the bag in place, i went through 2 or 3 tanks of gas with no reoccurance. that led me to believe it was just the gas cap. so i replaced it and my 442 changed to a 445. damn. i think i just got a bad autozone cap. it doesn't feel tight.

 

I wouldn't trust auto zone gas caps they suck specially the red ones with the black button.
I do emissions here and when people bring those caps here they are an automatic fail

 

the best way to find a evap leak is with a smoke test

 

Ok, what is a "smoke test"?

 

Just wondering if your from South Carolina.

 

halfamil, I'm in Cullman Alabama. Just south of Heaven and alittle north of Hell.

 

check your hoses first to see if there are any cracks or lose hoses.