Differential Unit problems of the 2011 Cadillac CTS

My Cts-v currently has 56,000 miles and very well cared for. My problem started at 25,xxx miles with a rear seal leak, it was replaced by dealer and 9 months later started leaking again. After the 4th trip to the dealer, they are now telling me it's the rear differential that is a �known issue� (with recalls on the earlier Cts-v's for the same problems) that needs to be replaced. The problem is there are no rear differentials! gm has discontinued the part ( my car is 6 1/2 years old and they made this car through 2015 and gm says the part is discontinued! the dealership has informed me that the care is �unsafe� to drive and suggest I pick the car up on a flat bed truck and take back home and garage it.

My 2011 Cts-v rear differential has now failed for the second time. First off, my car has been babied and extremely well taken care of. The differential first failed at approximately 17,500 miles and now this second time at approximately 38,900 miles. Both times the differential has started to make whining and/or growling noises that progressively get worse. My dealership replaced the first one and has had the second one back ordered now for 2 months (none in inventory & no estimated shipment). This is a well reported issue (109 occurrences found on line) for these cars. Why has Cadillac not issued a recall and affected a fix? what are the NHTSA investigation results?.

Please know the car is in mint condition and has never been in an accident. This is my dream car and stays well kept in my garage. It only has 19,500 miles on it. Rear differential whines or howls between 40-70mpg when under light load (like cruising or using cruise control) in 4th, 5th, and 6th gear.

The gm rear differential is defective on this 2011 Cadillac Cts I own. Nhtsa did an investigation on these rear differentials to include the 2004 to 2007 rear ends. The same rear end is on Cadillac sts, Cts-v and these rear ends were continued to be placed by gm, without fix, in Cadillac Cts until 2013. Same design, same mechanical parts. My car is a 2011 that just had a new rear differential from gm put in to solve its issues. After installation, the same problems exist with a roaring and thumping noise that has been verified by repair shops coming from the old and new rear differential. These issues are either with the side differential carrier bearings and/or the ring and pinion system. Gm has never provided a fix except to recommend a different viscosity of fluid that only quietens down the noise. Eventually, the rear ends have catastrophic failure and have caused, as investigated by the NHTSA, the car to spin and injury or worse result. This issue has never been fixed by gm and they continue to sell and install rear differentials for which there is no fix. I discussed this also at length with service manager of sewell Cadillac in dallas texas and they state that they replace these rears all of the time and that there is not fix for them by gm. I have enclosed my complaint to the repair shop that put the new gm rear end on my car without exercising their due diligence and research as to installing a major component on a car for which there is no fix by gm and the distinct possibility of a failure that would cause injury or death.

Every time the automatic transmission is put in reverse and the vehicle wheels turned sharply to right or left, such as in backing- out of a tight parking space, the car labors to move backwards and binding noises emanate from differential or rear axle area of the car. This condition lessens and completely disappears as the steering wheel is returned to the straight forward or straight back position. I believe this condition has existed in earlier models of my vehicle and has been the subject of a recall. This malfunction has existed ever since I purchased the used car in June of 2016. Other than the described issue, the car has served me well.

My Cadillac Cts 2011 has had a failure in the rear differential, twice since I have owned it. The first time was sept 2013 and the entire rear differential had to be replaced, and now Jan 2016, the exact same issue has occurred. There is a service bulletin on the vehicle of sb11084 and an NHTSA item number 10038765. It is a same that this is a know problem and a recall has not been generated. The vehicle will be out of the powertrain warranty at the end of February so unless a recall is done, this will not be covered on its next failure in a year.