06 Jetta Evap System Problem

[mikerhonda]

I have an 06 Jetta that is showing a code P0455-Evaporative Emission Control System Leak Detected (no purge flow or large leak). During the first few miles of driving, I hear a tick-tick-tick-thump sound coming from the rear of the car that is not related to tires/engine/speed/etc. The thump sound is pretty loud. The tick-tick-tick sounds like some type of piston-actuated pump. After >10 miles or so of driving, these sounds stop. After putting gas in tank, car will not start without pumping gas pedal. When removing gas cap, there is no 'rush of air' sound. All of this started two weeks ago with no previous issues.

I know that the gas cap is one of the top items for this but the seal on the cap looks very good. In addition, the local Volkswagen parts department stated that they've never ordered one before for replacement. I’ve also heard that the charcoal canister may be the culprit. Also, up until this started happening, I did ‘overfill’ when I got gas and I’ve heard that this is could have something to do with what’s happening. I would REALLY prefer not to take it to the dealer or a mechanic-I’m pretty sure I can fix it myself.

Questions: What is the tick-tick-tick sound? Where is the charcoal canister on this car and how hard is it to replace? Is there a way that I can do a smoke test? What else could be the problem?

[kevin FaKiN spLits]

My car makes that sound too, as well as my jetta and lady's gli. I think that is normal.Do you have a tune? I had the same problem and code before but it was due to a gas cap, and my seal looked fine too.

[LampyB]

how many miles are on the car? have you looked into the possibility of a bad fuel filter, or even a fuel pump? the sounds coming from the rear could be the pump, as its located under the rear passenger seat. if you have to pump the gas pedal to get it to start you may have a clogged filter or something within the fueling system.

sounds like you're going to need to take the car in to a shop for a diagnosis. doesn't mean you have to have them do the actual repair though. just pony up the cash to have it checked out then decide if its something you'll be able to repair yourself.

[HIBB 304]

The sound you hear is the LDP(leak detection pump) it pressurizes the tank to check for leaks.
I think theres a evap purge valve that sticks open or closed and causes the start up problem.

[elf911]

N95 Purge Valve happened in my car and was replaced under warrenty I remember thinking my exhaust was tapping off something and always had the issues after a fill up

[portuga101]

ive got the same issue, ive ran a smoke test and i have a leak somewhere under the gas cap in one of the hoses but i havent gotten to fix it yet, my car also takes a while to start after u refuel it i gues it loses preasure

[elf911]

Yeah 100% the same issue I had. Hope your still under warrenty but if not I'll look for a part number on my reciept

[portuga101]

way over the warranty lol, i would appreciate it, was it expensive to do it?

[JayCronk]

I know this thread is a bit old, but I have the same issue. I had it close to 2 years ago too and was still under warranty. They cleaned out a valve and got it working right again. I don’t want to take it in to have this done again so does anyone know how to clean this out at home? Where do I look to get to the canister and the valve back there to see if it is sticking? Thanks for any help that can be provided.

[tay272]

Not sure if any of you guys have experienced this while filling up but a few times that Ive gotten gas, right when I start pumping it into the tank Ill hear this gurgling and the gas wants to come right back out. If I keep trying to pump it, itll just kick off right away and stop like the tank is full but its not. When I pull the nozzle out of my tank you can actually see some of the gas like bubbling right inside the hole and after maybe 10-15 secs it will eventually drain into the tank. I have no idea whats causing this but its not every time I fill up. Might of happend like 4 times over the whole time Ive had the car (alittle over 2 years). Anyone else ever has this happen to them?

[JayCronk]

I have not had any issues with pumping gas other than when I first start it after pumping, it stalls out once or twice before I can really get it going. I think I have some issue with a valve or something back there and how the pressure is building up. All the clicking makes me think it has to be the thing trying to open and close and the popping is happening because of this too. Sorry I can't be any help on the gas issue.

[LampyB]

how many miles are on the car? you may want to just replace the fuel filter and see if it helps...it's a cheap part and takes 15-20 minutes to do. otherwise the ticking sounds like your fuel pump trying to prime, as it is located under your rear passenger seat. unfortunately it could be a bad fuel pump as well. i'd replace the filter and see if it helps, and if not then you may just have to take it in to a shop for diagnosis...

[JayCronk]

Would a bad fuel filter cause an evap system leak?

[QuiescentPlunge]

I know this is an old thread, but I've been having the exact same issue as mentioned above. After scanning I decided to replace the gas cap. It's cheap, and it was pretty nasty so I figured I might as well. I cleared the code, but it returned the next day.

Around this time my 07 Rabbit rolled 100k so I did all kinds of maintenance on it. Among the tune up was replacing the fuel filter. The fuel filter was definitely clogged up with something, fuel sprayed everywhere during removal. And a quick blow through the intake side proved restriction. I was hoping that the clogged fuel filter was throwing the code, so I cleared it again.

The tune up seemed to have cured the rough idle. And everything seemed normal until a couple days later the gas cap light came on, and a couple hours later the CEL came on. Same code. Overall the car runs better but it won't start after filling up. And to my surprise yesterday gas overflowed while I was filling it up.

My dad has a shop with leak detection tools, but I haven't had the time to make it out there. I'm thinking I'm just going to stop by the stealership till then and get a replacement valve since they are only around $20. Also, I would imagine I have to replace the charcoal canister now that the fuel tank overflowed

Just wondering what others have found that hasn't been mentioned in this thread.

[87socorro]

my girls 2.5 has been doing the same for a while now does anyone know if a recall was put out for these cars cause it seems to be a lot of people are having the same issues

[K8DizzleMK4]

My car threw a p0441 (evap code) and won't start without pumping the gas pedal, as well. I've replaced the gas cap (wishful thinking) and the evap purge valve (easy to do) but the CEL popped right back on the next day.

I'm thinking it's now the charcoal canister. Has to be right? I can access through trunk im assuming?? Anyone replaced one? Know the process? Just ordered one and it's en route...

[FL 2.0L]

My issue, too. Anybody solve this one yet?

[FL 2.0L]

New purge valve fixed my issues...

[IAMBRIANJOHANSEN]

The Pcv valve on these yaks are troublesome and can cause all kinds of leaks. start there and work your way back. An oil catch can ultimately fixed my evap problem. There expensive but worth it.