01 Suburban transmission

I have an 01 suburban that wont shift to any gear automatically and when i shift manually it will only go to 2nd, 3rd and reverse. Fluid is good with no leaks. Any advice would be greatly appreciated
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Answers
"ShiftA solenoid failed-- Or a wiring problem from PCM to trans or PCM itself. Needs diagnostic testing.
Soooo, you might try to find a scanner that can read TCM codes and that may lead you to a solution.