Excessive carbon build up in the engine combustion chambers may be the cause of a smog check failure due to excess NOx emissions. A "top engine" decoarbonization cleaning procedure will commonly correct this concern.
Problems for specific Cadillac models:
Car problem reports
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Most reported Cadillac problems
Illumination of the Check Engine Light may be the result of a loose or worn gas cap.
One or more fuel injectors may become stuck closed causing an engine misfire and the Check Engine Light to illuminate. Our technicians tell us that this problem can be caused by some fuel additives. There are special procedures which may be able to restore the affected injector. If this fails the affected injector must be replaced.
One or more of the power window regulators (one in each door) may fail causing the window to fall into the door and not roll up.
It is common for the fuel level sensor in the fuel tank read the fuel level incorrectly. The sensor must be replaced to correct the condition. Our technicians recommend having the complete fuel pump module replaced on high mileage vehicles.
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.
Oil was dripping from Oil Pan Gasket.
Replace Oil Pan Gasket & Seal.
i got trapped in the tranny replacement thinking i would never have to worry about it again, hah 2 months after the warranty its back. 3year 100,000 miles warranty and 40,000 miles later the 4000 dollars i had put in the car is all for nil. this motor drivetrain has so many service bulletins it is a another high end GM rip off,that was junk to begin with and Cadillac wont own up to it. Lets see a 70,000 dollar throw away my house was a bit mor...
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.