Help on a p455 code Topic is solved

[catchaj19]

So recently my XC90 has been throwing a 2 p455 codes. It follows a pattern after I reset the light. First thing in the morning no code when started the next time I start the car if it is only shortly(15-30 minutes) after the 1st time I get a filler cap loose open warning in my message center. After several seconds of it being on it disappears. The absolute next time I start the car I get the same filler cap message and the check engine light comes on giving me 2 p455 codes. It repeats this pattern if I clear the codes.

Things we have tried:
1. Replaced fuel cap with a genuine volvo fuel cap
2. Replaced the purge valve.

We gave the car a quick once over and didnt find any overt tears, rips, etc. I assume the next thing to try would be a better looking over of the hoses and such followed by a smoke test if we cant anything with a thorough inspection?

Any help would be appreciated as I only have about a month and a half until my inspection is up.

[ggleavitt]

Walk the evap hose all the way from the purge valve in the front to the evap canister in the back (remove spare, it's in the front part of the well). Look for a short-ish sleeve connection between the front hose section and the rear hose section, somewhere in the area between the fuel filter and the rear wheel well on the passenger side (can't recall exactly where it is). Check the J-hose and all hose connections on the canister and the pump.

Let us know what you find.

[catchaj19]

Thanks for your reply. We will take this route this weekend and let you know the results.

[catchaj19]

So the culprit was the filler neck vent tube. It had 3 pinholes in it since it had been rubbing against the body. We patched those with silicone and after 150 miles the light is still off. Hopefully it holds. Thanks again!