OEM and Remanufactured Engine and Automatic Transmission/Transaxle Identification

• Applies to 2003–2023 GM passenger cars and trucks.

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  2003–2023 GM Passenger Cars and Trucks

Steps to confirm (in the document’s order)

1. The engine bar code tag could be on a rocker arm cover, on the ends of a cylinder head, or on the oil pan or oil rail area of the engine.

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   The engine bar code tag is usually in one of several places. The bar code tag could be on a rocker arm cover, the ends of a cylinder head or on the oil pan or the oil rail area of the engine.

2. All remanufactured engines have a label on the right or left side of the block.

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   All remanufactured engines have a label (1) on the right or left side of the block.

3. On the 4.8L/5.3L/6.0L/6.2L (Gen III/Gen IV) engines the remanufactured engine label is on the left side of the block.

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   Left Side of Block • 2.2L/2.4L (Ecotec) • 4.8L/5.3L/6.0L/6.2L(Gen III/Gen IV)

Caution

• If a piston must be replaced, measure the cylinder before ordering; most of these engines have oversized cylinders, and oversized piston ring packs are not available for service.

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  If piston replacement is required, be sure to measure the cylinder before ordering a piston. The majority of these engines have oversized cylinders and oversized pistons ring packs are not available for service.

• If crankshaft bearings must be replaced, measure the crankshaft before ordering; a crankshaft that has been turned must be replaced, together with all new standard size bearings.

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  If crankshaft bearing replacement is required, be sure to measure a crankshaft before ordering bearings. If the crankshaft has been turned, it will require replacement with all new standard size bearings and crankshaft.