[waterski182]

Great advice on this from the person who explained you can fix with a screwdriver. Make sure to order correct solenoid vent valve by checking 8th letter of your VIN, and with a flathead screwdriver, I made repair in 5 minutes. Was located underneath Yukon behind fuel tank and towards the center, right in front of rear dif. Reset code after repair and drove many times, and never came back on. Part cost, $35, my time 5 minutes. Dealer quote $380..of which they said $270 in parts. What a rip...do this one yourself if you get code P0449..