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I have a 2006 trailblazer it is stuck in auto 4wd with 4wd drive service light on. Sometimes if you switch it it'll flash for about 30 sec to a minute and will just light up again in auto need help thanks
 

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2004 gmc envoy_slt
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Could be a problem with the transfer case encoder motor or a bad 4WD selector switch. With truck off, try running thru all the switch positions numerous times (this might clean any dirty contacts in the switch).
When switching between 2HI and 4HI (or A4WD) do you hear two distinct motor sounds, one from under the driver's side and the other from the right front wheel area?
 
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