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Code P0455

kimgentner2013kimgentner2013 Member Posts: 5
edited February 2016 in Chevrolet
Had fuel pump replaced then bought manufacture gas cap replaced relay 3 weeks ago now gas cap light is popping up engine light is on and is running worse everyday please any advice would be great
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  • Mr_ShiftrightMr_Shiftright Member Posts: 64,481
    It might be a large vacuum leak in the EVAP system. Large vacuum leaks will throw this code and might cause erratic running, as it leans out the fuel mixture to a point where the ECM cannot compensate.

    Smoke machines are often used to detect and fix EVAP system leaks

    You could also have a fuel tank leak, which is possible given your recent fuel pump replacement

    Also the EVAP canister fuel vent valve could be inoperative.
  • kimgentner2013kimgentner2013 Member Posts: 5
    thank you for your advice 
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