NHTSA Complaint #11444502 — 2015 CADILLAC CTS

In about mid November 2021 a grinding noise became noticeable from the rear of my car and quickly became louder. From experience, I thought it was probably bearing failure. The car was parked at that time and has not been driven since. Today is 12/20/21, so the car has been out of service for one and a half months at this point. An ASE certified mechanic inspected the vehicle and found the rear differential to be defective, it was identified as the obvious source of the noise and had metal particles in the fluid. Doing research I found that rear differential failure was common in Cadillac CTS's and a GM safety recall N192279370 had been issued with the bad units being replaced at "no charge". The Cadillac designated model in question is the CTS-V with the 3.6l twin turbo V6 engine. My car is a 2015 CTS with a 4L turbo engine. I haven't found a recall issued on this model and I don't understand why it hasn't been done. I feel that a differential failure in my vehicle would be just as dangerous as that in the designated recall vehicle, it's basically the same car with a different engine. The vehicle was inspected by one mechanic only, but his findings reveal an obvious fault. A review of the incidents with the designated vehicle involved show that very serious safety problem exists which would threaten the driver and passengers if this vehicle was put back in service. I expect that GM must recognize that this safety fault affects a wider range of their vehicles and it has to be included in their recall. I ask NTSHA to intercede.