A perhaps related issue -- a basic flaw in the evap system design, espcially in off-road conditions -- is covered in NTB05-099a, though the codes there are different from the one under discussion here.
I and a buddy have had problems with this a total of 10 times. With the service bulletin, the dealer should (and has, in my case) attempt the fix for free.
Unfortunately, so far, the fix has not worked in my situation. My code (1446) tripped within 100 highway miles of the repair and twice since then after reset.
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