If the TC (traction control) warning light comes on and stays on, there may be a problem with the traction control system.

The TC warning light will come on briefly when you turn the ignition to ON. If it does not come on then, have it fixed so it will be ready to warn you if there is a problem.

The light will also come on if you turn the traction control system off using the TC on/off button located in the glove box for the CTS and on the steering wheel for the CTS-V.

If the TC warning light stays on or comes on while you are driving, pull off the road as soon as possible and stop carefully. Try resetting the system by turning the ignition off then back on. If the light still stays on or comes back on again while you are driving, your vehicle needs service. Have the Traction Control System (TCS) inspected as soon as possible. See Traction Control System (TCS) for more information.