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Did you check the fluid level yet and does it do the same thing in reverse?
What about the fluid level and is it seting any codes in the computer?
Ok let me know what he says if you need further clarification. Typically if there are no codes and it does not go into gear once you put it to drive even if you shifted manually to low and it takes a while for it to engage it is a hydraulic pressure problem. Low is strictly a mechanical/hydraulic issue. There is nothing electronically that controls low or reverse. More than likely something is going on inside the transmission.