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It uses the same TCM as the civy 4L80 so should not be too expensive, it should have a number on the TCM something like 24230461.
There are 1000 TCMs for sale on Fleabay at this time listed under the example part number.
The tuning might be a little different from TCM to TCM but there are tons...
Re-seat all the connections after cleaning them with Deoxit and look for wear on the harness.
It could also be a TCM issue not driving/reading the ESS correctly.