mcgilles

I think the code I got was P0442 C H if I remember correctly, description is EVAP system small leak, aparently there is a different code for major leak! anyway, my car's got it, what do I do?

I cleared it out and it came back about a week later. I'm wondering if something didn't get put back together properly after I had Ed do a UDP, cam and tune on it. I e-mailed him about this when it first happened but haven't heard back, I'll have to try to contact him again now that its happened twice. is this something which I may be able to find and fix easily? what should I look for? Any help would be appreciated!

Russ K

First check that the gas cap is clicked on tight. Also check to make sure that the gas cap seal is in good shape. Then try a new gas gap.

I've also had leaking EVAP vent solenoids (on the inside right frame rail by the trans). They are about $45.00 CDN.

Russ Kemp

mcgilles

Thanks for the help!

from the service manual I guess the car pressurizes the fuel tank to prevent evaporative emissions from leaking out to the environment. if it pressurizes the tank and the pressure falls too fast it throws the code saying there's a leak. I'll check the fuel cap. I'm almost out and need some fuel today anyway. if that doesn't work how serious is this problem anyway? fuel evaporating isn't going to make any kind of noticeable drop in fuel economy since the amount evaporating its negligible. I know that fuel vapor is flammable, but I don't think we're talking about much at all.

so I guess my question is is this a dangerous kind of thing? if it doesn't fix easily by tightening the fuel cap or even replacement can I just have my tuner turn off this particular code and just ignore it?

Corvette-Chris

Most likely cause is the gas cap. I cant tell you how many of those codes I see at work.

mcgilles

I fueled up the car and made sure the cap was tight, I guess it will take about a week or so of normal driving to see if that code comes back. with all the electronics in a C5 you would think they could put a notice on the DIC that your cap is loose, just like door ajar etc. oh well.

I inspected the cap and did notice a lot of cracking in the seal in the cap. it pretty much looks like any piece of rubber which is exposed to heat, freezing temperatures, water, dust fuel etc for 7 years. if the code comes back I'll replace it.

thanks for all the help!

Ram907

Crossover tube between tanks will sometimes leak, as was the case with mine. Tank has to come out!

C5 Diag

This is an 11 year old post !!...yikes !!

bonesbrakr

For the same reason why newbies want to post on a 1.5 year old reply of a 11 year old resurrection.

Old School

New members posting in years old threads is a rite of passage on the Corvette forum apparently

bonesbrakr

Dude youre the newb. We can read but obviously you have a problem with comprehension. Its OK. Most children nowadays do. Youre not special.