What does it mean that tc is displayed on the dashboard of Cadillac ats?

This light is the traction control system off indicator (as shown below).

When the engine is started, the light will light up briefly. If it doesn't light up, please ask the Cadillac special after-sales service center of SAIC-GM Sales Co., Ltd. to repair the vehicle. If the system works normally, the indicator light will go out.

When the traction control system /StabiliTrak electronic stability control system button is pressed and released to turn off the traction control system (TCS), the traction off indicator lights up.

When the electronic stability control system of Stability Trak is turned off, the lamp and the turn-off indicator of Stability Trak electronic stability control system are lit.

If the traction control system is turned off, the vehicle slip will not be restricted. The drive mode should be adjusted accordingly.