The contact owns a 2006 Cadillac Cts. The contact stated while driving at various speeds, the vehicle vibrated violently and a loud grinding noise was heard from the rear differential. The failure recurred on numerous occasions. The vehicle was taken to a dealer where it was diagnosed that the rear differential needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The approximate failure mileage was 71,536.

- Peoria, IL, USA

The contact owns a 2006 Cadillac Cts. While driving 50 -70 mph, the headlights and instrument panel lights dimmed. The lights illuminated again minutes later. The failure occurred intermittently usually after driving for 2 hours. The instrument panel also failed during the daytime. Onstar stated that the lights do not remain off long enough to determine the cause of the failure. The dealer was unable to duplicate the failure. The failure mileage was 8,000 and current mileage was 20,000. Updated 03-04-08 the rear differential was noisy, the ABS would engage on their own

- Orlando, FL, USA

2006 Cadillac Cts rear differential failure during morning commute failed in heavy traffic and slippery conditions with no prior warning. There was an immediate loss of forward motion and vehicle control. I was able to regain control and continue directly to the dealer and left the car. The car is current at the dealer awaiting parts.

- Bellaire, MI, USA

2006 Cadillac Cts rear differential froze up- locking rear brakes while driving. *updated 12/12/07 the consumer stated heard some squealing noise in which he stated might be the emergency brake. The consumer stated towed to dealer and rear differential assembly replaced. The consumer stated GM tried to rectify the situation by offering 12 months free oil change and tire rotation and inspection, however the consumer declined. Updated 12/12/07

- Bridgeville, PA, USA

The first problem I encountered with the vehicle was a broken clutch pedal return spring that had fallen out from under the dashboard at 8,850 miles. This was repaired under warranty. Second, I had a Cadillac dealership replace the rear differential under warranty due to a whining noise and leak present at 9,021 miles. At this time I had questioned a clank noise present in the driveline when engaging or disengaging the clutch. I was told this is normal, and no problem was present at this time. At 10,530 miles, I was making a right turn from a stop in first gear. I had accelerated to 20mph and shifted into second gear. I began accelerating in second gear when the driveline failure occurred. The vehicle had spun 270 degrees to the right loosing control. This caused the the vehicle to hit the right side curb with extreme force to the left rear wheel, damaging the rear suspension and differential. The vehicle proceeded over the curb with all four wheels and stopped on a sidewalk. This also caused chassis and front suspension damage. The vehicle was unable to move after the accident due to the clutch not engaging. The clutch pedal travel is now about 3 inches total off the floor, opposed to the original 6 inch travel equal to the height of the brake pedal. As a result of the accident the vehicle was totaled by the insurance company and sold. At this time no assistance has been given by General Motors.

- Greenfield, WI, USA

Rear differential whine and leakage - 2006 model, build date Nov 2005. The car is used for freeway commuting only (300 miles/day) and has never been driven hard. The differential has whined since delivery with 78 miles on the car. The differential fluid was changed at 2847 miles with redline 75W-90 synthetic fluid and GM 1052358 additive, and significant metal powder was removed from the magnetic drain plug at the time of change. On April 16, at a little over two months and 8413 miles, I took the car back to the selling dealership for repair, as the differential had begun leaking about April 10 and ~7200 miles. The service manager, wyman adcock, drove the car and reported that while he could 'hear a slight whine', he thought that it was normal and I should continue to drive it to see if it gets worse. I pointed out to him that GM has had problems with the differential on this car since it's introduction and that another Cadillac dealer told me that they had replaced so many differentials in these cars that they now keep one in stock. The service manager told me that he had never heard of a problem with these cars. I suggested that I should take it another dealership, and left.

- Auburn, CA, USA

New (4 month old) Cts would not accelerate when I attempted to pass another car, Cts seemed to slow down. The car backfired and blew white smoke. The rear of the car made a loud noise as if grinding and loud rumbles. Computer did not did not detect malfunction. Dealer determined rear end differential unit malfunction.

- Alexandria, VA, USA

: the contact stated while driving 70 mph on the interstate, both rear wheels locked without warning resulting in a loss of vehicle control. The contact managed to maneuver the vehicle to the side of the road without incident, but all the instrument cluster panel lights illuminated. The vehicle was towed to a dealer who determined the rear differential needed to be replaced. After the differential unit replacement, the problem persisted. The manufacturer was not alerted.

- Appleton, WI, USA

(1) normal driving (2) rear differential leak and whine; coolant leak from the radiator (3) going to the dealer tomorrow.

- Fayetteville, NC, USA

New Cts Cadillac 2200 miles. Leaking oil from the rear differential on to the exhaust pipe. Noise (clanking) when putting the car into gear.

- Houston, TX, USA

2006 Cadillac Cts-V: 1. rear end leakage @ 200 miles 2. rear end clunk when shifting @ 1000 miles

- Henderson, NV, USA