Service vehicle vehicle soon light turns on

The service engine soon light normally means there is an issue with something that is not powertrain or emissions related. GM split some of the less serious codes out and put them under this warning light so the fact that you have this and the anti lock light coming on, I suspect we have a wheel speed sensor issue.

https://www.2carpros.com/articles/abs-wheel-speed-sensor-test

Here is a guide that will help with this but we need to start with checking to see if there are codes to go along with the lights. We need to use a scan tool that can communicate with the ABS module. Here is a guide that will help with this:

https://www.youtube.com/watch?v=rTtAnsOlZU4

https://www.youtube.com/watch?v=ANWVTh2RQoQ

Also, I am attaching a TSB that will help with this if you have performance issues which is pretty common.

Please run through this info and let us know what codes are there and we can go from there. Thanks