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Hi Im david and here is a process that you may want to try to narrow down the possibilities.
there are so many possibilities. my first thoughts are the shift solenoid for first gear is gummed up. or a passage is blocked. with out a scan tool with transmission code capabilities, the only chance to reset the ecu and tcm is to disconnect the battery, both cables, touch them together for a few minutes then reconnect.
touching the cables together release any static electrical charges from components. its not dangerous as long as they are disconnected from the battery
here is a very valuable tool to have. please leave a rating for me, its the only way i get credit for my answers. i can still assist you without any extra fees even after you rate me. im the only one that can close this out...thank you
Im going to opt out and let another expert who is more familiar with this issue help