There’s no reason to guess about this. You need to get the DTCs read. Unfortunately, you will have to go to a dealer or an independent with a GM specific scan tool to get the ABS codes. I suspect that all three are related. A fault with the ABS causes the traction control to shut down because it uses the ABS for control. If the ABS fault results in it not being able to tell the PCM how fast the car is going, you will also get a Check Engine Light. It may just be a wheel speed sensor, but getting the ABS codes will tell you where to start looking for the problem.