Hi,i am getting a lot of traction control +abs light while driving on my 07 denali any body face this problem ,i took the car to the dealer many times at the end they told me to replace pcm i think it has nothing to do with it .

 

You need to find out what codes your truck is throwing. If the dealer is telling you the PCM is bad, they are full of poo......they obviously don't have a clue what is wrong and they are grasping at straws. It most likely is a bad ABS pump, or a bad wheel speed sensor.