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Thread: Trouble Code PO455

  1. #1
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    Trouble Code PO455

    I have a 2003 gmc Serria 4.3L engine I have trouble code PO455 I put my code reader on and it says Evaporative Emission System Leak detected (gross leak/no flow) Can somebody out there tell me what to fix are what parts to change have no clue what this is thanks for any help.

  2. #2
    Senior Member Ford4x4Chik27's Avatar
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    Yeah from what I've got, there's a leak in the Evap system... and there's about 12 pages of diagnostics on it
    '93 Isuzu Amigo, Toyota Axles/Tcase/Drivelines, 35" MTR's. '01 Pathy, DD.
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    Yesterday is history, tomorrow is a mystery, today is a gift - that's why they call it the present. - RW Emerson



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    Po455

    Thanks does this mean I should get a manual are keep searching thanks for the reply

  4. #4
    Senior Member Ford4x4Chik27's Avatar
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    I'd recommend taking it to a shop, unless you're very secure in your mechanical abilities... Messing with the emission system is no joke.
    '93 Isuzu Amigo, Toyota Axles/Tcase/Drivelines, 35" MTR's. '01 Pathy, DD.
    ~*~*~*~*~*~
    Yesterday is history, tomorrow is a mystery, today is a gift - that's why they call it the present. - RW Emerson



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    po455

    Thanks very much for the info

  6. #6
    Senior Member Ford4x4Chik27's Avatar
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    I wasn't trying to be condescending... Just being straight with you that's all
    '93 Isuzu Amigo, Toyota Axles/Tcase/Drivelines, 35" MTR's. '01 Pathy, DD.
    ~*~*~*~*~*~
    Yesterday is history, tomorrow is a mystery, today is a gift - that's why they call it the present. - RW Emerson



  7. #7
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    Po455

    No I did not think so you was just trying to help but I did more research on the net and one guy said he brought it to the shop with the same trouble code and they found his gas cap was not screwed in so I just walk out and check mine it was not screwed in also I guess I forgot I will see if it comes up again thanks for your time and help

  8. #8
    Senior Member Ford4x4Chik27's Avatar
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    LOL I'm glad it was that simple! I didn't read through the 12 pages I found on the issue to see if that could have been an issue! Glad you got it resolved
    '93 Isuzu Amigo, Toyota Axles/Tcase/Drivelines, 35" MTR's. '01 Pathy, DD.
    ~*~*~*~*~*~
    Yesterday is history, tomorrow is a mystery, today is a gift - that's why they call it the present. - RW Emerson



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    po455

    Thanks again I read another po455 same problem the person had no gas cap will see soon enough thanks again for your help

  10. #10
    Senior Member scottie's Avatar
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    keep it simple... start with the gas cap
    im a straight shooter with upper management written all over me

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