I did some work on a friend's Charger but he brought me some other surprise issues that I've been troubleshooting for him. (surging, TCS on, Brake switch code, non-working wideband)

Issue / Question: He had a traction control light on and you could feel that ugly grinding brake feel. He had mentioned that he had a vs sensor replaced and that didn't fix it. I know he has 3.91 gears (2012 Charger) now so I suspected he has worn tone rings that I'll be replacing. That said, would those cause the scanner to spike in reading vehicles speed? I see a spike go from 1 mph to 319 and back down every now and then. I'm asking in case this pinpoints an exact issue that would be easy to address while I have both axles out.

<sidenote>
I also found that he had a brake switch replace but still had a code P0573 Brake Switch A Circuit High. I found that in the Communication area he had inadvertently disabled Brake ESP over CAN and BCM Equipped. I found those just doing a compare to his stock tune.