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About CU_14SierraAT

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    New Member

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  • Name
  • Location
    Clemson, SC
  • Drives
    2014 GMC Sierra All-Terrain
  1. P0446 - Help Please

    Thanks for the replies. I’ll try flooring it first, if that doesn’t work I’m going to replace the vent valve. If that doesn’t work I’m going to replace the fuel tank pressure sensor and if that doesn’t work I’m just going to reset the light every time it comes on lol.
  2. P0446 - Help Please

    Bump. Anyone?
  3. Recently bought a 2014 Sierra All-Terrain package with 48,000 miles. I love the truck but recently got the p0446 code. (Evaporative emission system vent control circuit). So far I have cleaned all the lines and the vent valve. I don’t want to start replacing things without knowing for sure what will fix it. Any help with this would be greatly appreciated!

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