Consumer Affairs is reporting that the United States National Highway Traffic Safety Administration (NHTSA) is opening an investigation into reported differential failures in 2003-2006 CTS and 2005-2006 STS models. Interestingly, the SRX, which, at least in rear-drive form, should be using the same rear differential is not being investigated.
There are 20 reports from owners of rear differential failures, including 9 that resulted in loss of vehicle control. The reported failures occurred at as few as 3400 miles.
An investigation would be the first step toward a recall – though many investigations result in no further action. A recall could impact over 350000 cars.
ConsumerAffairs.com: NHTSA Probes Cadillac STS and CTS