GMPartsGiant.com offers the wholesale prices for genuine 2012 Cadillac CTS Wagon parts. Parts like Automatic Transmission Upper Control Valve Body Assembly are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 6 Cyl 3.0L, 6 Cyl 3.6L, 8 Cyl 6.2L. Model Code: 4 DOOR WAGON, 4 DOOR WAGON(RHD), V 4 DOOR WAGON.