I did some forum searching and didn't see this as something that came up, so I thought I would put a post out there and maybe it will help someone in the future. I got a Service Stabilitrak warning light and TCS and ABS lights. I pulled the codes and it said the wheel speed sensor was bad. After replacing the wheel speed sensor didn't fix it I looked at the reluctor wheel on the wheel bearing had rusted and cracked. This caused a bad wheel speed signal. This has now happened on both of my rear wheels. I have a 2012 ECO with 180k on it. It is actually just as easy to do the rear bearing as it is for the rear wheel speed sensor because the sensor is placed directly under the brake line. Something to look for if you are having this issue.