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Hullo all. When I got my oil changed last time, I talked the dealer into updating my PCM program. I haven't noticed any real change yet, and I'm still waiting to see what happens on the regen (I haven't notice it going into regen yet either!). Anyway, I was playing with my dash settings, thinking there might be something new and exciting in there (there wasn't), and in the "Setup" menus, I ran across one that has "Zone = 9".
Okay, never mind...I found my own answer (RTFM!!). Still, I should be in Zone = 7.
So, for those who are too lazy to look it up (I almost was), This is a setting to help calibrate your compass. On page 134 of the Owner Guide, 4th Printing, It has a map of the US with the zones. Mine was set for Florida/Tennessee/Ohio and such. Interesting, as the truck came from Oklahoma before I got it. Must be the factory setting from the build plant (Kentucky??).
Oh, and it also has the calibration procedures there. Enjoy!