2003 GMC Yukon P0446 Error code, engine feels like it is va

  • 1 POST
  • 2003 GMC YUKON

Engine Performance problem
2003 GMC Yukon V8 Two Wheel Drive Automatic 170000 miles

My shop truck is reading the P0446 evap emission system vent circuit code and I have no idea what needs to be replaced. When the truck is at operating temp, it feels like it vapor locks when I press on the gas from a stop light. It seems to me that these two issues would be related since it is a vent code. I was told from my parts store it could be my charcoal canister or the vent attatched to it. There is always a lot of pressure realeased from the gas cap whenever I fill up and releasing that pressure seems to help the vapor locking issue as well. Any help would be greatly appreciated.

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Friday, January 29th, 2010 AT 9:32 AM

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Replace the vent solenoid, very common. There is a new updated vent solenoid for these, it will come with a new filter which needs to be relocated to the side of the transmission. Here is the part #15105605
Bracket, EVAP Emission Canister Purge, 10382105
Valve, EVAP Emission Canister Control. Also check the evap canister, alot of them fill with gas from a restriction in the evap sys or overfilling the gas tank, just remove it and see if its filled with gas, if it is replace it.

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Friday, January 29th, 2010 AT 2:21 PM

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