Question about 1998 Pontiac Sunfire

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Light came on had it coded says its po440 purchased new gas cap light still on could still be three other things evaporated canister hose cracked. Purgevent solenoid Vacuum leak at engine .what should I do

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  • Jeremy W.
    Jeremy W. Mar 23, 2011

    Did you clear the code after the gas cap was installed?

    The check engine light will not just go out by itself immediately after a repair.

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I would do just what you said in that order, I would check your hoses to the evap canister,make sure you dont have vacuum hose leak anywhere, then change the solenoid, if your still getting the code, then change the intake manifold gasket.
Hope Ive helped you-Rate if u can I would appreciate to know if I did well for you.
Thanks and have a great day

Posted on Mar 25, 2011

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2007 chevy cobalt po440 code which is a evaporative emission code. I have checked the evap canister and it appears to be okay. replaced the gas cap with a factory gas cap. any other ideas? thank you.


What engine ? could have came with three different ones . 2.0 , 2.2 or 2.4 l . What did you pull this code with , code reader , autozone ? . Your vehicle does not have this code . Factory service info . Suggest you take to chevy dealer .

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I have a 2004 town and country. I have had codes po440 on for about 9 months with no symptoms. Then po456 showed up. My van started surging wanting to take off after filling the tank. Then it would not...


code p0440 refers to evaporative emission (EVAP) system--malfunction===causes -hose connections--intake leak--EVAP canister
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The error code PO440 comes up about two weeks after clearing. Checked the hoses, all looked great. The fuel cap o-ring looks good and the sealing ring on the gas filler look good, What do you suggest?...


Try checking The last two on the list.
    P0440 Generic Definition

    EVAP (Evaporative Emission System) small leak/no flow condition
    - The Evaporative Emission system is monitored for it's ability to hold vacuum.

    Probable Cause[s]

    1. Defective or loose fuel cap
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    2002 dodge durango engine light on. after diagnostic test.results indicate evaporator hoses are leaking


    Check your gas cap first.

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    2001 toyota 4runner< engine light on, code comes out to be - p0441 auto zone said change gas cap, i did, 2 weeks later light comes on again< what do you think?


    You can get this code if you don't tighten the gas cap all the way, or the gas cap is bad. I will put all the detail for the code below and what I would do to fix the problem...

    NOTE: Do not top off your tank either. This could cause the 'overfill check valve' to fail, and could cause this code.

    Definition of P0441: Evaporative Emission Control System Incorrect
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    detection cause: Pressure in charcoal canister and fuel tank does not drop or
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    What I would do:
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    The next steps require a diagram, so the purchase of service manual to locate the components is very helpful

    2. Check for vacuum leaks in ALL emission hoses
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    4. Check for cracks or leaks around or in the charcoal canister (usually requires a smoke machine)
    5. check for voltage to VSV's
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    Good luck!

    -Chris

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    you have to understand that there is a leak in the system other than the gas cap for the evaporative system. The system needs to be professionally closed, and smoke introduced into to find the leak, and a through component check, eg.. purge valve vapor canister vent solenoid all functioning correctly

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    2000 cavalier check engine light code po440


    P0440 - Evaporative Emission (EVAP) System


    evaporative emission (EVAP) system has a large leak.
    Check the gas cap or vent valve. these are the most common problems.


    The Powertrain Control Module (PCM) at different times performs various tests on the EVAP system. OBD II Enhanced EVAP systems are in place to keep fuel tank vapors from venting into the atmosphere, and instead purges them into the engine to be burned. Regular pressure tests are conducted by the PCM to monitor the sealed system for leaks. The PCM monitors the EVAP system pressure by watching the Fuel tank pressure sensor (FTP). When the sensor indicates a small leak in the EVAP system, this code is set.


    Here are some additional causes.

    * A small leak in any of the EVAP hoses or fuel tank hoses
    * A small leak in the purge valve or vent valve
    * The EVAP Canister may be leaking

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