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Chasin' Down yee ol' Check Engine code.... S40-V40

posted by  someone claiming to be volvo_wingnut on  Fri Nov 22 18:20 CST 2013 [RELATED]


Hey Folks,

I'm trying to chase down a problem with my v40 check-engine light and I noticed a couple other recent thread-posters here are also doing.

The code I am reading (Thanks Autozone...) is : P0455

This code relates to something with the gas-tank/gas fumes or evaporation mitigation system.

My first question boils down to this... I have been told that this could be as simple as the gas cap not getting cranked down and sealed properly, so this is the place to start. Being cheap, I have not as of yet baught an ODBCII reader that can clear codes. I was told that I could get around this (clear codes) by disconnecting the battery for a while. I tried this both at a half-hour interval and then overnight, but the code seems to remain. The check engine light remains on the instant I restart after reconnecting the battery. Is this possible, or does the code get thrown so fast at start-up that it looks like it was never purged? Is this battery trick perhaps just a myth, and the little brain can hold onto codes in flash-memory somehow?

OK... so my second question is... I think I may want to finally order a ODBCII reader from amazon... Can anybody tell me what I need to look for? I am not familiar with such terms as "can-bus" and "ELM327", and the number of product choices on amazon is a bit daunting. Are there some certain features/protocols/parameters I must look for for my 2000-v40 car?

Any tips or opionions on makers or versions of this tool, and whether to go with a handheld one, or the ones that can connect to a laptop or iPad via wireless?

Thanks as always!

- Wingy







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    Chasin' Down yee ol' Check Engine code.... S40-V40

    posted by  KlausC on  Sat Nov 23 10:57 CST 2013
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    last visit: Fri Oct 24 10:15 CST 2014
    [RELATED]

    Autozone policy is to read codes but not to delete them. Other parts stores might lend you a reader to use in the parking lot, which means that you can also clear them.

    I am not sure if the 2000 V40 has a purge pump, it seems a little early for that model, so I wonder why disconnecting the battery didn't clear it. The P0455 is generic and not specific to Volvo and could mean several things. Most often it is a cracked "J" hose at the charcoal cannister in the rear of the car.








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      Chasin' Down yee ol' Check Engine code.... S40-V40

      posted by  someone claiming to be volvo_wingnut on  Sat Nov 23 15:08 CST 2013 [RELATED]

      Thanks Klaus,

      Is the charcol cannister easily visible/accessible to look for this j-hose? Is it right under the back bumper, on the driver side?

      It's strange to me also that the code didn't clear after taking both terminals off the battery off overnight...!?







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        Chasin' Down yee ol' Check Engine code.... S40-V40

        posted by  KlausC on  Sat Nov 23 19:34 CST 2013
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        last visit: Fri Oct 24 10:15 CST 2014
        [RELATED]

        In the S/V70 it is close to the right rear wheel, above where an axle would be.

        Volvo tends to move things from year to year, in the 850's it was behind the left front bumper.







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        Chasin' Down yee ol' Check Engine code.... S40-V40

        posted by  alschnertz on  Sat Nov 23 17:04 CST 2013
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        last visit: Fri Oct 24 10:32 CST 2014
        [RELATED]

        Oh yea, I meant to add to my post this morning that disconnecting the battery did not clear the codes on our '01 either.

        From my research back in 2009, it's pretty typical that disconnecting the battery to clear codes on early S40s doesn't work.
        --
        "Differences of opinions should be tolerated, but not if they're too different' - Sharon Craig








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    Chasin' Down yee ol' Check Engine code.... S40-V40

    posted by  Chris Mullet on  Sat Nov 23 10:09 CST 2013
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    last visit: Fri Oct 24 09:08 CST 2014
    [RELATED]

    Look at the rubber seal on the gas cap. Is to dry and cracked? If so, you need to replace it. You can try smearing Vasoline on the rubber seal and screw it back on good and snug. Drive the car for a couple days and if the light goes off you've found the problem.








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    Chasin' Down yee ol' Check Engine code.... S40-V40

    posted by  alschnertz on  Sat Nov 23 05:09 CST 2013
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    last visit: Fri Oct 24 10:32 CST 2014
    [RELATED]

    A loose fuel cap shouldn't require a tool to reset the CEL.
    If that indeed was your problem, give it a few days / miles / cycles to go through and hopefully it'll go off on its own.
    Wouldn't hurt to check for cracked hoses under the hood.

    As an aside, resetting the CEL on an early S40 can be troublesome.
    I purchased a ScanGauge II when we got our '01 S40 in 2009. It was the first car that I ever experienced a CEL and the ScanGauge II came recommended by another S40 forum. Well, it read the codes, but wouldn't reset the CEL.
    I inquired to the maker of the ScanGauge II and they were surprised that it didn't work on the S40 but were also extremely helpful. They sent me a step by step procedure to reset the ECU. The ScanGauge II has reset the CEL every time since then.
    --
    "Differences of opinions should be tolerated, but not if they're too different' - Sharon Craig








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    Chasin' Down yee ol' Check Engine code.... S40-V40

    posted by  james_a_sousa on  Fri Nov 22 20:39 CST 2013
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    last visit: Thu Oct 23 18:51 CST 2014
    [RELATED]

    What year is your car?

    I had a problem with a loaner when Volvo first added the monitor to the gas cap and I was told that the dealer had to reset it and not to worry, just remind them when I brought the car back.

    I checked the gas cap and it was loose.

    They told me that the new light trigger was a big pain in the butt.

    By the way - buying a code reader will not help you if you do have a loose hose in the system.

    You might try posting a better description of your problem by mentioning the code number in the title.

    Klausc might jump in on it.








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      Chasin' Down yee ol' Check Engine code.... S40-V40

      posted by  someone claiming to be volvo_wingnut on  Sat Nov 23 15:02 CST 2013 [RELATED]




      Year = 2000

      My cap seems fine... no dings on the cap or rim or brittle rubber seal to cause a leak I think. Last time I checked it though, it did seam like I was better able to cramp it down so that it might have a better seal.

      That is why I wanted to clear my CEL light, so I couls see if I had perhaps better sealed the cap.

      I've been told that once a code is thrown ot the check engine light, it will not clear itself with subsequent drives, thus the reason I'm considering getting my own scanner.







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