on u-tube a couple guys show a much cheaper 14 dollars fix for this not easy but can be done im tj and have blogged on this before,the car may run ok but gas mileage and will not pass emissions where applicable have had this problem multiple times it is listed under engine and drive train also
Problems for specific Cadillac models:
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Most reported Cadillac problems
A burning smell may develop due to an oil leak form one or both valve cover gaskets. Resealing the valve cover will generally correct this concern. However, the valve covers should be inspected and replaced if damaged.
An engine vacuum leak may develop from the throttle body gasket causing a higher than normal idle speed. Failed gaskets should be replaced.
The trunk pull down switch may fail causing the trunk lid not to close completely. Our technicians tell us that the failed switch can be replaced without changing the complete pull down motor assembly.
The front struts may show signs of wear, or be excessively bouncy ride at freeway speeds. This may begin to occur at around 75,000 miles.
The engine may develop a misfire due to worn valve seats. This fault will cause the Check Engine Light to illuminate. Our technicians tell us the misfire may or may not be felt while driving. They further recommend that both cylinder heads be removed and thoroughly inspected and repaired as necessary.
The inside door handles are prone to breaking.
The steering wheel position sensor may fail, resulting in the service stability message being displayed.
The transmission may develop a harsh 1-2 shift and/or illumination of the Check Engine Light with code P1870 stored. This can be caused by wear of the bore for the TCC isolator and regulator valves in the valve body. This condition does not commonly occur until the transmission reaches normal operating temperature. If the valve body is worn, replacement will be necessary to correct this concern.
A/C condenser cracked in 4 places. Have to replace as well as well as the on/off switch stopped working.
I purchased a 2012 Red CTS-V off the lot of a Houston area Cadillac dealer. Shortly after purchasing the car, I heard a rattle when accelerating on to the highway. I immediately set up an appointment to the dealer to have it looked at. When speaking to the service advisor, he asked if I put "regular" gas in the tank (off to a REAL bad start). I stated I knew about the corvette pushrod technology and the eaton supercharger screwed on the engine...