1997 Intrepid Code P0740 Torque Convertor Clutch Control

1997 Intrepid Code P0740 Torque Convertor Clutch Control
Anyone ever come across this error on a 3.5 L 1997 Intrepid.
Had a factory re-man engine put in about 5 months ago. Runs
great but this check engine code came up. Dealership reset it somehow and I'm waiting to see if it will come back. Transmission has about 140,000 miles on it but seems OK. Never had a check engine light come on until new engine.
How serious is it?
How does the dealer reset the check engine light?
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