anyone familar with these codes and solve it; p0441= evaporative emission system incorrect purge flow.
p0446= evaporative emission control system vent control circuit, i'll be appreciated!

 

What year is your vehicle? see these codes on plenty of cars at work. Check your gas cap. These codes are from your evaporative emissions system which is just another gay way of regulating emissions from your gas tank. These codes will trip if you left your gas cap loose or off. Don't see very many of these codes on trucks, but anything is possible.

 

On the T100 it will take 1-2 weeks of a loose gas cap to set a code. I tried this recently. p0441 points to: (per FSM)
-vacuum switching valve for evap
-ECM
-vacuum hose blocked or disconnected
-charcoal canister.

Some components in the evap system have had their coverages extended to 150,000 miles. The charcoal canister is part of this. Check you mileage and if you are under you may want to contact a local dealer.

Of course, check the vacuum lines for any obvious cracks, especially near the ends where they fit over hard line nipples. My vac lines are cracking on my truck so I am replacing them as I find them.

Good luck!