Service Electronic Stability Control flashed on the dash?

That can be caused by multiple issues. To start you need a scan tool that can read all of the modules in the vehicle. Most of the lower end ones cannot read those, they instead read most of the engine and emission codes. For this you need one that can read the engine, transmission. ABS and the stability systems.

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Once you know the codes and what the PCM sees as a problem you can start testing the pieces to figure out the actual bad part(s). Without them you could replace a lot of expensive parts without repairing the issue.