Rear differential failed on a vehicle with 60,000 miles and required a $4,200 repair. The manufacturer warranty covers up to 70,000 miles, but the age of the vehicle voided the warranty. Five Year manufacturer warranty and the vehicle is 7 years old, but within the mileage. Without the repair the vehicle is worthless, whereas it is worth @$14,000 {Kelly Blue Book}. Checked online and it is not uncommon for this model and the newer CT-5/6 models to have this issue.

- Savage, MD, USA

The rear differential has failed in my vehicle, and I was told by the dealer it is a safety hazzard & could lock up, leave me stranded or cause an accident. (this is the same safety issue as thousands of other vehicles most from 2014 & 2015 that IS on a recall).

- Greenville, SC, USA

The contact owns a 2017 Cadillac CTS. The contact took the vehicle to a dealer for maintenance. The contact was advised by the dealer that the differential was leaking and diagnosed the differential and determined that the roll pins and pinion gear were showing unusual wear. The contact had the vehicle repaired. The contact stated that one year later the vehicle was taken back to the same dealer and the contact was advised that the differential was leaking. The vehicle had not been diagnosed. The vehicle was not repaired. The manufacturer was informed of the failure. The contact researched online and related the two failures to NHTSA Campaign Number: 20V038000 (Power Train). The failure mileage was 105,188.

- Fallbrook, CA, USA

The car has 37250 miles on it. 6 months ago, it started shifting roughly between 1st and 2nd gear. We took it to waldorf Cadillac/GM in waldorf, md. They acknowledged it was a known issue and would take the following steps: Flush the transmission, re-program the transmission, replace the valve, and ultimately, replace the transmission. They have done all the actions except replace the transmission and won't take further action. The car shifts so violently at times that you don't know if you're going to hit the car in front of you. We live in the Washington DC area, so traffic is usually stop-and-go. When the car gets to the top end of 1st gear (around 9 mph) it hesitates, then slams into second gear. It has also gotten "stuck" in first gear, while turning onto a street. The engine accelerated but the car wouldn't shift so I had to pull off immediately or risk being hit by oncoming traffic. It has only done this once since we started having problems.

- Waldorf, MD, USA

Car has locked in 2nd or 3rd gear two different times, both after long drives (2+ hours at highway speeds) and would not downshift into 1st to stop movement. The first time was a stop light and almost caused an accident, the second time was in my driveway and almost hit the house. Good brakes are the only thing that saved me. Both times, the vehicle shifted to 1st with a loud bang. Transmission also jerks the car forward from the stopped position when engine starts at a stop sign or light (when auto-start./stop is enabled).

- Williamson, NY, USA