Intermittent C1202

I have a 2010 with a little over 300k miles and a constant abs/brake/traction light that won’t go away. I wouldn’t care but it puts the car in some limo mode where the regrr er n brake is deactivated and it sucks.

A local shop actually replaced the reservoir and put in fresh fluid. Nothing. I changed the battery because a light was left on for a week and it was 6 years old, and the light went away for a few days. Now it’s back. I clear the code, and it’s on as soon as I start the car. I think one or twice I started the car and it was clear, but mostly on. Could this be some connection somewhere?