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If it was in your transmission control module, then it is a transmission fault- if it was an engine fault stored, it would just set a fault in the TCM saying "check engine faults" That way they do not get cross-referenced (unless in the case of systems that both use the same sensor, like wheel speed sensors)
I would start out checking the connector plugs at the front of the transmission- they are notorious for having tranny fluid push out through the pins and set faults. Repairing involves dropping the pan, removing the valve body, and replacing the wiring harness inside there.
OK, let me know how it goes.