Conditions for Setting the DTC
WARNING: This page is about a different car, the 2020 Buick Regal and 2019 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
P0741
TCC Slip Speed = Less than a predefined threshold
P2817
TCC Slip Speed = Greater than 129 RPM
P2818
TCC Slip Speed = -50 to 30 RPM