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P0440 code

 
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Wil
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PostPosted: Wed Jul 20, 2011 9:20 pm    Post subject:  P0440 code Reply with quote

Hi,

Check engine light came on my '03 3.4 stock Impala. Cleared the code, but haven't driven it yet since to see if it will come back. Is there any common issues
with these vehicles that will cause this code?

Thanks,

Wil
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IffyG
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PostPosted: Wed Jul 20, 2011 9:54 pm    Post subject:   Reply with quote

Could be as simple as a loose gas cap... tighten it up at see what happens.

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Zoopa
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PostPosted: Mon Aug 08, 2011 3:21 pm    Post subject:   Reply with quote

I'm going through the P0440 codes blues too. I replaced gas cap - check engine light came back. I replaced the purge solenoid valve- check engine light came back. Not sure what to do next. Car is an '02, 3.8 liter, with 120k.
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ZSPOT
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PostPosted: Mon Aug 08, 2011 3:29 pm    Post subject:   Reply with quote

Zoopa wrote:
I'm going through the P0440 codes blues too. I replaced gas cap - check engine light came back. I replaced the purge solenoid valve- check engine light came back. Not sure what to do next. Car is an '02, 3.8 liter, with 120k.

I'd check the evap VENT solenoid valve at the rear of the car. I sell a lot more of those than I do purge valves.

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Zoopa
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PostPosted: Mon Aug 08, 2011 4:12 pm    Post subject:   Reply with quote

Thanks! Is that something that I should swap with a new one, or should I check with the operation with a multimeter first? In both cases for me (fuel gas cap, and solenoid purge valve) these were affordable items.
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ZSPOT
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PostPosted: Mon Aug 08, 2011 4:27 pm    Post subject:   Reply with quote

They can actually get clogged do to dust and typical road grime so I'm not for sure if you can test them without a Tech II to tell it to open and close. A GM one runs about $35 retail or $32 shipped from me anywhere in the states.

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bigdog60
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PostPosted: Mon Aug 08, 2011 5:46 pm    Post subject:   Reply with quote

IMO it's better to just replace, it will work on the bench 20 times, then fail..Think I'm on #3
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Zoopa
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PostPosted: Tue Aug 09, 2011 2:22 pm    Post subject:   Reply with quote

Thanks ZSPOT! I sent you a PM to purchase the vent.

I watched some U-Tube videos last night to educate myself on fuel evap systems. Turns out, the evap vent brings in air and to equalize the system when needed. As you note, it has a filter that get clogs often. The dirt and grease cause it to stop working, probably because they are often located at the back of the car. I saw a video where a guy was relocating an evap vent on his GM truck. The instructions for the new part had him relocate it to the front end of the truck above the transmission and run a tube all the way through the frame rail to the evap system. Thanks again!
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