Hi! I'm sorry about my english, I'm from Catalunya in Europe, and I don't speak it very well.

We have a Tahoe 2003 and it shows the message "4WD Service" sometimes, also the light "neutral" on the traction buttons apears ON, and all-traction doesn't run.

now it has 60k miles,
what can it be? In my region/province there are only Opel/GM Services, and don't know so much american cars, only european, maybe I can help them with your info.

Thanks a lot.