Brake controller issue with no answers.

I have a 2017 Crewmax. 2 wheel drive. The Brake controller warning lit up the dashboard like Christmas. Took it to the dealer. They diagnosed a faulty left rear wheel speed sensor (fault code C0215) Way to expensive to fix there, so I took it to a local mechanic. Replaced the sensor, still have the issue. Found 2 other codes that have nothing to do with the brake system. Recommend fix….new battery. Went to Autozone, they said the Yellow Top Optima I have is just fine. Called an auto electric place and they said $160 an hour to diagnose the issue. I’m at a loss here. Any ideas or suggestions? Thank you in advance.

 

How is the wiring or the plug on the wheel sensor?

 

Looked just fine, no corrosion or frays.