2004 silverado evap issue

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  • ole.gray
    Junior Member
    • May 2018
    • 5

    2004 silverado evap issue

    the issue i have is the pressure in the tank does not change even when fuel cap removed and the voltage does not change. still learning my scanner but feel the problem is the fuel tank pressure sensor. the code is p0445. still have a few more checks to do, just wondering if i am on the right track
  • Crusty
    Senior Member
    • Dec 2007
    • 2450

    #2
    Originally posted by ole.gray
    the issue i have is the pressure in the tank does not change even when fuel cap removed and the voltage does not change. still learning my scanner but feel the problem is the fuel tank pressure sensor. the code is p0445. still have a few more checks to do, just wondering if i am on the right track
    Go into special functions
    Command the "Purge and Seal" test and watch the pressure
    The Purge valve should open to draw down the system and the vent valve should close so the purge valve can draw it down.
    Then with the vent still closed, the purge valve can then be closed to seal the system maintaining a vacuum

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    • Glide
      Senior Member
      • Jan 2015
      • 303

      #3
      Originally posted by ole.gray
      the issue i have is the pressure in the tank does not change even when fuel cap removed and the voltage does not change. still learning my scanner but feel the problem is the fuel tank pressure sensor. the code is p0445. still have a few more checks to do, just wondering if i am on the right track
      I don't see P0445 listed for a 2004 Silverado in my service info.Are you sure that you selected the vehicle properly in your scan tool ?
      P0445 is normally a purge solenoid fault code.

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      • ole.gray
        Junior Member
        • May 2018
        • 5

        #4
        That is the code my ethos pro brings up. Fairly new with these scanners still trying to figure it out. Thank you for the help.

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        • Witsend
          Banned
          • Nov 2012
          • 2942

          #5
          That is the code my ethos pro brings up. Fairly new with these scanners still trying to figure it out. Thank you for the help
          P0445 I think is code for a large evap leak.
          I usually suspect either the cap is off or the canister vent (close) solenoid valve is stuck open. Should hear a audible clack on a key on engine off activation coming from rear of vehicle if it electrically working

          Comment

          • Glide
            Senior Member
            • Jan 2015
            • 303

            #6
            Originally posted by Witsend
            P0445 I think is code for a large evap leak.
            I usually suspect either the cap is off or the canister vent (close) solenoid valve is stuck open. Should hear a audible clack on a key on engine off activation coming from rear of vehicle if it electrically working
            P0455 is large leak.

            Comment

            • Witsend
              Banned
              • Nov 2012
              • 2942

              #7
              P0455 is large leak.
              Yep, 2004 don't seem like it was all that long ago, but for a Fourteen year old rusty SilverRotthole, that large leak could be everywhere

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              • ole.gray
                Junior Member
                • May 2018
                • 5

                #8
                My correction the code was p0446. Figuired out was a bad fuel tank pressure switch.

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