FIXED! P0455 - 2017 Honda Pilot, 60k miles

Mobile Dan

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Those slots may be normal. I think this pic shows replacement parts. 1640144195030.png
 

Mikerizer

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I think you're right...the slots do seem to be normal. The REAL seal is the white, inner part.
I pulled the following codes today:
P0455 (1/6) Stored - EVAP System (Very) Large Leak Detected
P0456 (2/6) Stored - Evap System Very Small Leak Detected
P0455 (3/6) Pending - EVAP System (Very) Large Leak Detected
P0456 (4/6) Pending - Evap System Very Small Leak Detected
P0455 (5/6) Permanent - EVAP System (Very) Large Leak Detected
P0456 (6/6) Permanent - Evap System Very Small Leak Detected

I'm not one to just throw parts at a car, but a local dealer had a shutter and cap set in stock, for $34. Since the CEL went off for a brief time after a recent fill-up, I thought it logical that perhaps the nozzle being inserted and removed may have helped to temporarily seal a leak. It took some doing to get the outer cap off...four clips at about 2:00, 3:00, 10:00 and 11:00, and one at 12:00 that was very difficult to get to. I ended up cutting that bit with a hack saw blade. Anyway, when I got it off, the filler neck had five burls on it, like someone had hit it with a screwdriver and hammer. Not as deep as a chisel would go, though...still, maybe enough to cause a leak. I sanded them down with some 60 grit and 80 grit, and put an extremely thin coating of sensor safe silicon on the lip. I installed the new shutter set, cleared the codes, and drove it for two 15-minute drive cycles. So far, so good. My daughter is flying in from a trip at midnight tonight, and will drive it home. We are planning on taking it on an 8 hour drive to Gatlinburg TN on Thursday....fingers crossed.
 

grcauto

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The canisters can develop cracks that even smoke will not pass through. We use nitrogen to charge the system and spray soapy water, we use simple green with a 5 to 1 ratio. 5 water and 1 green. It'll find the smallest leaks.
 

grcauto

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Makes you happy to beat it. These leaks can be a real pain. Glad it worked for you.
 

JackC

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Great news. Sure takes lots of patience and diagnosis on this newer stuff.

This helped me learn about these cap less fillers. Thanks for letting us know the fix.
 

nickb2

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We use nitrogen to charge the system and spray soapy water, we use simple green with a 5 to 1 ratio. 5 water and 1 green. It'll find the smallest leaks.
I am curious, why nitrogen?

I have never head that before, cuz I use nitrogen all the time, just never thought of using it in an evap system. But if you say it has an advantage, I would like to know what that is. Just curious, and I could easy rig up some kind of separate fitting to use with our smoke machine.

I also like the simple green trick, cuz I dilute my big blue which we use for AC leaks. The BIG BLUE stuff is expensive.


Simple green is on my next thing to buy when I go out for shopping .

This the green stuff you are talking abiut? If so they have it at my local canadian tire for https://www.canadiantire.ca/en/pdp/simple-green-all-purpose-cleaner-3-78-l-0532462p.0532462.html?gclid=EAIaIQobChMIpdrR-MuM9QIVsmxvBB0ejQ-7EAQYAyABEgIC4fD_BwE&gclsrc=aw.ds#store=151

thx.
 

grcauto

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Nitrogen is a much smaller molecule and will find the smallest of leaks. We used simple green mixed 10 to 1 and sprayed things. Doesn't take but a few seconds to foam. Your smoke machine should have that capability.
 

billr

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I gotta ask... why would nitrogen work any better than air? Air is primarily nitrogen, with most the rest being oxygen, a molecule that is smaller than nitrogen. The only (common) gasses I see smaller are hydrogen and helium, but not enough smaller to be worth the bother.
 

nickb2

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nickb2

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@Bill, said pos shyster works fine with 5 or so psi, shop air, propane whatever, as long as the psi is holding, hence my question. What is the advantage from nitrogen slash french azote?
 
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