I have a 2005 Cadillac Cts with 67,000 miles. Since about 65,000 miles car has been making a rattling sound under the hood during acceleration. I have given the car a tune up, oil change and the car has other fluids are at level. Once my car has accelerated and the gears have changed (I.e, second gear) the rattling sounds stops..the noise is continuous and only happens at acceleration, not while idling. In addition every now and again when a front seat passenger gets in the car the airbag sensor/light comes on the dashboard. This problem doesn't happen often but it happens every once in a while. Upon doing my research for both these issues I find that I am not the only one having this problem...hopefully something will be done so that GM can address these serious issues without having the consumer/owners having to pay an arm and a leg.

- Philadelphia, PA, USA

Rear differential of my Cadillac Cts-V has begun to whine at 70,000 miles, dealer says the only option to fix it is to replace.

- Edmond, OK, USA

I just bought the car on December 18th, 2009 from a small dealer. It snowed over the weekend in Delaware. I have been noticing a loud noise coming from the rear axles as I would try to navigate through the snow. It sounds like the rear is hopping up and down radically. This is happening from the point of take off when trying to drive through the snow at low speeds of 5 mph. I took the car to pep boys in philadelphia, pa to get an oil change and the mechanic's informed me that they heard the rear bouncing up and down when they were trying to Transport the car from the parking space to the car lift.

- Claymont, DE, USA

I own a 2005 Cadillac Cts with a 3.7 liter engine, and automatic transmission. I am the second owner, and purchased this vehicle when it had 55,978 miles on it. After driving the car for less then 2 years, it developed a noise coming from the back (rear end). I brought the car to my local Cadillac dealer. After a road test and inspection, the dealer determined that the problem was the rear differential, and it would need to be replaced at a cost of about $1700. I've owned many used cars over the past 30 years, some with over 100,000 miles on them, and I've never, never needed a new rear differential on any vehicle that I've ever owned! I understand that this is a common problem with this model. The dealer stated that the seals were good, and that all of the fluids were at the correct levels in the differential, and that the earlier Cts models had experienced problems with differentials, but that the problem was rectified with the 2005 model. Apparently it would seem that there are also problems with the 2005 model differential as well!

- Wakefield, MA, USA

I have a 2005 Cadillac Cts and have taken into the Cadillac dealership for rear end loss of control and bouncing of rear end. I know there was a recall on some type of rear end issues. I am tired of arguing with the ed morse dealership in tampa, fl about the recall and defect with the car. Please advise me as to what to do.

- Tampa, FL, USA

Car shutters when driving up a grade. Has been in for service 4 times this month and still not fixed.

- Central Square, NY, USA

Events leading to failure: No abuse, no tire burning. Vehicle used for commuting and job related purposes. Problems & resolutions: 7/11/2005 7/18/2005 problem shifting - dealer could not verify sunroof rattling - dealer could not verify right-rear sail panel broken - warranty repaired pixels burn on nav screen - nav unit replaced wheels scratched - dealer paid for repair front panel loose - replaced loose panel 7/25/2005 7/27/2005 left-rear panel broken - warranty repaired competition mode not working - warranty repaired dash panel loose - warranty repaired 8/22/2005 8/24/2005 wheel hop - service bulletin warranty repair hard to put in reverse - dealer says normal grinding when shifting - aligned exhaust system sunroof rattle - dealer could not verify sunroof material loose - warranty repaired 10/19/2005 10/23/2005 fuel gauge malfunction - warranty repaired 11/21/2005 11/23/2005 sunroof rattle - dealer could not verify drivetrain rough - dealer could not verify clunk when shifting - dealer could not verify car pulls to the right - tires bald @ 9000 miles battery failure - warranty repaired grinding in 5th gear - dealer could not verify 11/29/2005 12/1/2005 rattle from rear - warranty repair suspension right-rear panel broken - warranty repair; dealer warned this would not be covered under warranty anymore as "someone" is braking the panels on purpose 2/6/2006 2/8/2006 clunk from rear - dealer replaced differential/drivetrain unit under warranty. 5th gear sometimes hits reverse - could not verify grinding noise in reverse - dealer forgot to check unit won't play cds - replaced navigation/radio 2/15/2005 2/17/2006 grinding noise in reverse - dealer replaced transmission under warranty; area rep advised they will not replace future failures. Competition mode not working - warranty repaired.

- Philadelphia, PA, USA