Originally Posted by danfigg
I thought the TC was part of the drive-by-wire system and when the TC was activated it gives the engine less power and not applying the brakes
If you have a 2006 GTO owners manual go to page 4-9 and read on. It reduces engine power and applies brakes as needed.
More information from GM:
Traction Control (TCS)
Traction control will not have any effect on the operation of the vehicle until the control module detects one or both of the rear wheels rotating faster than the front wheels. At this time the electronic brake control module (EBCM) will request the powertrain control module (PCM) to reduce engine torque. The last measure taken to control the rear wheels is for the EBCM to apply the rear brakes. Once the rear wheels begin to rotate at the same speed as the front wheels, the system will return full control to the driver. During Traction Control mode, if the brake is applied to only one rear wheel, most of the torque from the engine will be directed to the other rear wheel which will improve the traction of the vehicle.