2001 Olds Alero Code P0442

buzzlink22 · **Joined:** Thu Sep 13, 2007 9:39 am **Posts:** 1

I need some help. I don't know to much about cars, I have a 2001 Oldsmobile Alero and the service engine light came on. My brother in law checked the car and the code P0442 came up. Something about a leak of some kind. If anyone could throw some more information my way that would be great. Thank you so much.

Sponsored Links · **Joined:** 29 Jun 2004 08:12 pm **Posts:** N/A

jeff compton · **Posted:** Thu Sep 13, 2007 11:39 am

Try posting in the correct forum for starters and then check the forums for Po442 dtcs and evap dtcs, that's what it is! pretty common!

Darkrooms · **Joined:** Thu Mar 29, 2007 9:44 am **Posts:** 1424

moved

crwlrjeff · **Joined:** Sun Oct 07, 2007 11:30 am **Posts:** 2

P0442 is a leak in the Evaporative Emissions Control System. This system feeds fuel fumes back to the gas tank instead of letting them to vent into the atmosphere.

The single most common cause for codes in the range or P0440 to P0456 is improper seating of the gas cap. The gas cap is not the only failure item, but it is the most common, and the most common malady of the gas cap is that it is not installed, or not securely tightened.

P0442 is a Small Leak, this is far more often than not a result of the gas cap not being securely closed. If your gas cap clicks (ratchets) then you should make sure to ratchet it three or four times everytime you close it. If your habit is to only turn it until it resists, then it may still be loose. Turn it until if clicks, then click it a couple of extra times. I like three clicks, but I'm sure you need at least one.

Webmaster · **Posted:** Sun Oct 07, 2007 3:33 pm

FYI, for further reading: http://www.obd-codes.com/search/?q=p0442

Darkrooms · **Joined:** Thu Mar 29, 2007 9:44 am **Posts:** 1424

Moved to P0XXX. Again.

Darkrooms · **Joined:** Thu Mar 29, 2007 9:44 am **Posts:** 1424

@ crwlrjeff
The EVAP system doesn;t feed fumes back to the gas tank. The fumes from the fuel tank are stored in the charcoal canister and purged into the engine as the ECM sees fit. Enhanced EVAP systems also incorporate a vent solenoid that allows for pressure testing of the system.
Small leaks detected can be a gas cap, but depending on the age of the vehicle, could be EVAP hoses and it;s not at all unlikely that one of the solenoids isn;t sealing properly.

Webmaster · **Posted:** Sun Oct 07, 2007 8:45 pm

Darkrooms wrote:

Moved to P0XXX. Again.

Huh? That's odd, I didn't move the post. But I did delete the second identical thread with no replies earlier today. Perhaps you moved the other post and not this one? Then I deleted the other thread and you moved this one? It doesn't really matter now

Darkrooms · **Joined:** Thu Mar 29, 2007 9:44 am **Posts:** 1424

Yeah, or else I posted that I moved it and forgot to actually move it!

fuel injection center · **Joined:** Tue Sep 11, 2007 5:46 pm **Posts:** 191

HI ¡

Check all your EVAP system.. From the beggining to the ending.
Check for broken or lossen EVAP lines..

2001 Olds Alero Code P0442

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