
2003 trailblazer v8/auto. 4WD service light on. Reset it a few times and every time I used the 4x4 the light came on and it stayed in 4WD Hi mode. I removed the servo motor and checked that it really worked at full speed and it did. I moved the shifter shaft manually with no problems so I replaced that servo motor and had no problems for a few hundred miles on a couple of 4WD applications. I will update in a few months.

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