evap code 0442

I am trying to locate the evap cannister on my kids 2000 grand am. it is giving me a small leak code and i am trying to fix this myself, I just installed a LIM and I am ow dealing with two codes one is for the throttle position sensor and the other is this small leak, the gas cap was loose. how long does it take for a code to leave the system??..thanks

Welcome to AF !

Its possible the evap canister, its located in the rear portion of the car. Right next to the fuel filter, its a large square box.

Id check all the hose clamps in that area. They tend to loosen up over time and get small leaks. Thier are several right in that area.
If the leak is fixed the code should disapear very soon.

You can also check this thread below for more info on the specifics on this DTC.
http://www.automotiveforums.com/vbulletin/showthread.php?t=622473

Hope that helps!

2000 grand am: just replaced lim and now dealing with CEL stuff. one code pertained to throttle pos sens. replaced part, code is gone. 0442 remains. i have replaced the gas cap and purge solenoid. code cleared and vehicle was driven several days, before CEL lit and gives 0442 code again! i sprayed all the hose ends/couplings with carb cleaner thinking this would alter the idle speed and therefore show the leak. no luck. is there the possibility that i have faulty vent solenoid??

That codes pertains to a small leak.

Did you check all the hose clamps(the fill neck clamps) in the rear by the tank and solenoid ??

I'd also check the fuses pertaining to the EVAP emissions system, and all the vacum lines on the intake. Also your EGR is part of this system.

Sometimes these are easy fixes sometimes they are not.

Also no need to post duplicate threads on the same topic(s).
Sorry, but Im merging your two threads.

the hoses and lines appear to be okay nothing loose or rotten and the cann looks okay. as i stated i sprayed carb cleaner on all the hose connections and all over the intake with no change in idle. so i dont think there is a vacumm leak there. wouldnt the egr have its own code? Is there a vacumm line for the a/c under the battery?? right now its dark and the driveway is darn cold. i will get back to this tommorrw. hope your here to help! also what about these fuses? are these located under the hood or inside the car? thanks for the help

Fuses could be in any of the three fuse boxes.

I dont think carb cleaner is a good diagnostics tool for this problem.
What do you think XI ??

i didnt have any ether so i figured the carb cleaner is pretty combustible and thus would affect the idle if a vacumm leak was present. too old school? anyway nice hood on your poncho

well..........took off the cannister vent solenoid it was not dirty or clogged and when i aplied 12v to the terminals it seemed to function ok...plunger goes in and out. i am going to let it warm up and then check plug for 12 volts it, it seems it will only have voltage when pcm calls for cannister purge. i put key in on position but engine was cold, and did not get any reaction from vent solenoid by unplugging or plugging in connector.

I believe that the 12Vdc will be present all the time and when the pcm call for the canister to vent, it will enable the ground which will cause the solenoid to engage to vent the canister.

yeah carb cleaner wont do much in diagnosing this.
And the po442 is not necessarily a vent solenoid issue. More like a leak.

Did it do this before you changed the LI ???

As I mentioned before, this link/post(from the above link I posted) explains how the systems works. :2cents:
http://www.automotiveforums.com/vbulletin/showpost.php?p=4358015&postcount=1

Good Hunting

the vent solenoid was on a list of possible causes from the scan tool, i am probably going to have to take it in.

At least you already have an idea of whats wrong, that may save you a few bucks.

the vent solenoid was on a list of possible causes from the scan tool, i am probably going to have to take it in.

I hope the fix is cheap, and Good Luck!

i see a lot of corrosion on the filler pipe, previous owner must have driven this car quite awhile with the lim leaking anti freeze, the exhaust clamps we corroded in half from the coolant running down the bottom of the car. to answer a previous question, the CEL was on when I bought the car for my duaghter. I hope that the auto supply store carries this part (filler pipe)

the pipe was bad. gm parts guy tells me this is very common. been diving the car daily with out cel popping......fingers are crossed. now if i can figure out why her blinkers are acting up i would really be "the man" lol. thanks for all the advice gentlemen.

what is wrong with the blinkers?

You should start a new thread on the blinkers. :grinyes:

Also search works, and we've coverd problems with the multi function switchs-MFS and hazzard/blinker relay.

Glad you got the Evap leak resolved! :thumbsup:

That blinkers problem could possibly the multi-function switch?