2006 Chevrolet Silverado 1500 Q&A

2006 Chevrolet Silverado 1500 Question: Auto trans I can put selecter in drive and 3rd pistion and its like in nutreal

I can put selecter in drive or 3rd and like its in nutral but can put in 2nd and 1st and it will take and pull can manully shift all gears and it'll pull but wont shift on its own what will cause this There is no transmission codes pullin up -
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