P0442 Code Info? - Searched, nothing found
Thread Starter
Racer
Joined: Jan 2021
Posts: 431
Likes: 132
From: Plano, Texas
P0442 Code Info? - Searched, nothing found
My scanner shows P0442 today at the gas station after filling up. CEL and this code came up which appears to be EVAP related.
I saw plenty of posts for C7, C6, C5 but not C8.
Anyone have experience and what to expect until I can get it to service?
Thanks
I saw plenty of posts for C7, C6, C5 but not C8.
Anyone have experience and what to expect until I can get it to service?
Thanks
Team Owner
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From: Raleigh
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Team Owner
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From: Raleigh
Thread Starter
Racer
Joined: Jan 2021
Posts: 431
Likes: 132
From: Plano, Texas
I cleared the code but it, at first, left it in "permanent" status. Drove today and haven't seen it come back. I will double check and pull the code before I even bother to take it in. Doesn't seem like a big deal?
Race Director
Joined: Mar 2001
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From: Bonneville Salt Flats
I've had such on several vehicles over the years. If they had a gas-cap I'd clean the seal and mating surface... or, on cars without caps I took the included funnel and pushed it in and out of the filler spout a number of times. Unless I actively erased the codes (often on the road when it happened and no reader present) it then went away on its own after another fill-up or two! All the best. 
Safety Car
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From: Granada Hills CA
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Did you ever get this resolved? Have the same exact code for c8
Burning Brakes
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From: Ontario
Le Mans Master
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From: Florida
On many (or maybe all) of these capless fill tubes, there are two spring loaded flaps, not just one. The outer (top) reachable flap is more a dust/dirt cover, but it's the inner flap that leaks and causes the P0456 or worse leak P0442.
The inner flap which is the seal that is needed to pressurize the system during the EMS startup test is opened by the tip of the fuel filler nozzle. If the C8 has the lower flap that is not sealing well, that is the problem.
On my non C8 car, I was able to temporarily hold open the top flap and shoot a small spray of silicone which would temporarily fix P0442, until the next fillup. Eventually I had to replace the filler neck @ over $1,000 for the part.
The inner flap which is the seal that is needed to pressurize the system during the EMS startup test is opened by the tip of the fuel filler nozzle. If the C8 has the lower flap that is not sealing well, that is the problem.
On my non C8 car, I was able to temporarily hold open the top flap and shoot a small spray of silicone which would temporarily fix P0442, until the next fillup. Eventually I had to replace the filler neck @ over $1,000 for the part.