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Q: 2000 GMC truck service 4wd light on, stuck in four wheel drive. on 2000 GMC Sierra 1500

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Had truck scaned will not engage code came up ( not sure on code number think it was 323 or 363 not sure). Replaced encoder motor,4wd control module,tranfer case, dash switch, tested wiring harrness,actuator motor,all in working order. What have I over looked?
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