Gave me the code P0731. Gear 1 incorrect ratio.

Any ideas on where to start looking? Anyone else run into this code? I'm thinking the trannys finally about to die.

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03 Black Freedom Edition.
Full Skids
Self Installed Evic.
Self Installed Auto-dim rear view
Custom light bar.

In the works : Lift kit, courtesy entry lighting, back up lighting and rear seat lighting.