p0442 trouble code...?

p0442 trouble code...?

Postby fleetline51 [OP] » August 25th 2017, 9:58pm

197,000 miles on this '01- 2wd -4.3 vortec. Was traveling down the N.J. Turnpike ( :o )
and saw my CEL illuminate. Did not affect driveability so I made it down to our Delaware Beach house, 200 + miles away. Drove it all week with the CEL on but with no issues.

Got back home a week later (CEL still on) and read the code...p0442-emissions system-
(small leak) . Dumped the code today and will drive it a while...I'm SURE the CEL will come back eventually.

My Question...Anyone here have an idea where to look first? :shrug:

Any help would be Genuinely appreciated! :dance:

Best Regards,

Tony :obscene-drinkingcheers:
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Re: p0442 trouble code...?

Postby AstroWill » August 25th 2017, 10:22pm

No problem Tony, but you do have time to edit your original post, just click the edit button.

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Re: p0442 trouble code...?

Postby fleetline51 [OP] » August 25th 2017, 10:29pm

AstroWill wrote:No problem Tony, but you do have time to edit your original post, just click the edit button.



Roger That, Brother...Just wasn't quick enough on the trigger! :oops:

Will watch for that in the future!

Best Regards,

Tony :beer:
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Re: p0442 trouble code...?

Postby AstroWill » August 25th 2017, 10:36pm

To answer your question, it's a leak in the evap system, most likely an engine compartment hose that has degraded. It's really cheap to replace all of the vacuum hoses under there, just do them one at a time so you can't mix them up. ;)

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Re: p0442 trouble code...?

Postby fleetline51 [OP] » August 25th 2017, 11:18pm

Is there an informative post or otherwise some direction 'Ya can point me to?

I just did a major tune on my Astro less than a week ago...No doubt it was me who must have dislodged sumthin'!

Thank You Again, Brother!

Tony
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Re: p0442 trouble code...?

Postby AstroWill » August 25th 2017, 11:36pm

There are a few sections to the evap system, but the problem is probably up by the canister(near the battery). The best thing is to take a look at the GM Techline eSI(link in my sig), it's the digital factory service manual in a virtualbox image, it will have all of the diagnostics checks and diagrams.
https://goo.gl/n8dJkS
If you get stuck anywhere, let us know.

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Re: p0442 trouble code...?

Postby fleetline51 [OP] » August 25th 2017, 11:55pm

Okay Astrowill...I am Stuck.! What do I look for up at the canister?

Thank You!

Tony
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Re: p0442 trouble code...?

Postby TurnNburn » August 26th 2017, 12:18am

my vote is for gas cap... or the mating surface of the filler tube to the gas cap
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Re: p0442 trouble code...?

Postby AstroWill » August 26th 2017, 4:39pm

fleetline51 wrote:Okay Astrowill...I am Stuck.! What do I look for up at the canister?


Hose damage, if they are cracked, brittle, lose, etc. Sometimes the canister fittings get brittle and can crack if in an accident or even if someone is rough with the hoses. On the astros the canisters are pretty stout, but it would still be something to look at.

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Re: p0442 trouble code...?

Postby fleetline51 [OP] » August 26th 2017, 8:58pm

Hmmm...Could the evaporative purge valve fittings cause this trouble code if they were dislodged or otherwise damaged during the major tune I performed a couple of weeks ago?


I was pullin' on a lotta' stuff under there while changing ignition wires...I dunno'.

Thank Y'all!

Best Regards,

Tony
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