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Where did your last statement regarding a special TCV replacement program come from?The last statement seems to indicate that they will cover replacement of the valve body - usually these are handled as an "extended warranty" on that particular component. I know on my 2017 Honda Accord the DRLs fail at such a high rate that Honda sent me a letter a few years back saying they extended the warranty on the DRL to 10 years - unlimited mileage.
Dealers will install new transmission control module software free of charge. This module will monitor valve performance and detect excess wear approximately 10,000 miles before a wheel lock-up condition could occur. If detected, the transmission will shift gears to prevent lock up and a service engine light and reduced propulsion message will display.
GM will also provide a special program to cover the repair of transmissions that the software identifies as having a defective control valve.