CTS 2003-2005

Engine Identification

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The engine code is represented by the eighth character in the VIN and identifies the engine type, displacement, fuel system and manufacturing division.

The engine identification code is either stamped onto the engine block or found on a label affixed to the engine for 3.2L, 3.6L and 5.7L engines, or on the cam drive cover at the front of the engine for the 2.8L engine. This code supplies information about the manufacturing plant location and time of manufacture.

The eighth VIN position identifies the engine. This is important since many parts books require the engine VIN to correctly identify the engine. For example, this content covers a 3.8L (VIN K) engine and a 3.8L (VIN 1) engine. The VIN K engine is normally aspirated while the VIN 1 engine is supercharged. Knowing the correct VIN of the engine is key to getting the correct replacement parts.



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Fig. Engine Identification Number-3.1L (VIN M) engine



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Fig. Engine Identification Number-3.4L (VIN X) engine



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Fig. Engine Identification Number-3.5L (VIN H) engine



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Fig. Engine Identification Number-3.8L (VIN K and 1) engines

 
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