The rear axle pinion seal may leak causing fluid loss and possible internal rear end damage. Replacing the faulty seal will commonly correct this concern. Some 2005-2007 models have been recalled for this issue.Google+
Car Problem Reports
Cadillac CTS Rear Axle Pinion Seal May Leak
Cadillac CTS Problem
Average Mileage: 104,958 mi (67,710 mi - 199,000 mi)
Visitor, 2005 Cadillac CTS, 80,000 mi
The rear is leaking and I looked it up and it is recalled so I call them about it and they told me it is vin spesific and my vin didnt match. It doesnt make any sense that all these people would have the same probalem. Im sure its the same seal even though they say its different. If you held the two seals next to each other im sure they are the same. Its a crock. GM just doesnt want to fes up to it. We need to make a statement and get it taking care of before someone's brakes and it takes someone's life in a accident.
Visitor, 2004 Cadillac CTS, 67,710 mi
Cadillac dealership is recommending they service my rear axle to "reseal rear end" estimating $807.80 for the damages.
Visitor, 2004 Cadillac CTS, 102,000 mi
It was diagnosed by Cadillac and I was told it needs to be fixed.
Visitor, 2006 Cadillac CTS, 199,000 mi
took it to mseveral mechanics for another problem and all 3 told me about the seal