Trouble Code PO455

Discussion in 'GMC Truck Forum' started by cajunwoodrick, Jul 5, 2007.

  1. cajunwoodrick

    cajunwoodrick Full Member

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    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. Ford4x4Chik27

    Ford4x4Chik27 Senior Member

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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 :eek:
     
  3. cajunwoodrick

    cajunwoodrick Full Member

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    Po455

    Thanks does this mean I should get a manual are keep searching thanks for the reply
     
  4. Ford4x4Chik27

    Ford4x4Chik27 Senior Member

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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.
     
  5. cajunwoodrick

    cajunwoodrick Full Member

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    po455

    Thanks very much for the info
     
  6. Ford4x4Chik27

    Ford4x4Chik27 Senior Member

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    I wasn't trying to be condescending... Just being straight with you that's all :D
     
  7. cajunwoodrick

    cajunwoodrick Full Member

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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. Ford4x4Chik27

    Ford4x4Chik27 Senior Member

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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 :)
     
  9. cajunwoodrick

    cajunwoodrick Full Member

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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. scottie

    scottie Senior Member

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    keep it simple... start with the gas cap
     

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