This started two days ago when Traction Control tried to engage, the messages came up on the DIC. Code was C1233, indicating R/F Wheel Speed Sensor. I took it into the dealer and they replaced the sensor. Drove it home, had to break it lose one time to make sure the Service Traction Control didn't come back on... sure enough it came back on. Taking it back to the dealer tomorrow. Frustrating, especially when I told them how to test it. It's like they simply did what the manual said and then didn't test it.