Less than a month ago I had my sensor and my 4wd module replaced on my 03 Tahoe. on 2003 Chevrolet Tahoe

The Service 4wd light went out for a bout a week and it comes on now when I drive the car. It seems to be transferring into 4wd fine although the front end feels a little weird but it's an older truck. I also had the instrument cluster replaced several months ago and had a full tuneup done as well when I had the sensor and module replace? Any Ideas why the light still comes on?

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