Truck won't switch back to 2wd on 2005 Chevrolet Silverado 2500 HD

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2005 Silverado Duramax that just turned 100K miles. Ran the truck in 4H this morning on way to work due to heavy rains and everything was fine. When I went to switch it back to 2WD, nothing happens. It will go into 4L and back to 4H but not into 2wd. The push button seems a little "mushy" compared to the 4L and 4H buttons. When I turn the key to the "On" position, all three selector lights illuminate for a couple of seconds plus a little red "N" light
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