- Buick Ownership
I've just had this same problem on my 2011 LaCrosse CSX. Reluctor rings are the moving part on the hub that the sensor picks up on to determine wheel speed. In my case, with only 70,000 miles, the right rear reluctor ring is missing several pieces on the hub. The hub required replacement. $500 bill. Seems like a significant reliability problem on a $40,000+ car.