My 4wd was working. Parked for four weeks now does not work. Why on 2002 Chevrolet Trailblazer

lights work on dash switch but does not ingage in to four wheel dr.

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1 answer 2 comments
check the solenoid on the front diff
(correction) The 2HI light is lite and it is stuck in 2HI. The other lights do not lite or ingage.
could be a bad switch