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If the transfer case encoder switch control fails, the service 4wd will come on and the vehicle will not switch to 4wd when selected. This is located on left side of the transfer case, and if memory serves frommy GM days is not an expensive fix (Including parts = less than $200) at the dealer, but should be done there.

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Q: Why does service 4wd come on when you put it in drive on a Chevy trailblazer?
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