TSBs

Locating General Motors engine identification number

Dec. 10, 2024

This bulletin applies to a range of Buick, Cadillac, Chevy and GMC vehicles equipped with 2.0L or 2.5L engines.

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The engine ID number is outlined in red for purposes of this illustration.

This bulletin applies to a range of Buick, Cadillac, Chevy and GMC vehicles equipped with 2.0L or 2.5L engines.

During the programming of some ECMs, the technician may be prompted to input the engine identification number. This is being done for calibration to engine tracking purposes.

The engine identification number is found on the engine tag. Tag locations may involve the front timing cover or side of the engine block near the oil pan.

When entering the number, do enter any spaces if spaces exist on the tag. The engine identification number is denoted by the red rectangle in the accompanying photo. The actual tag does not feature this red rectangle.

About the Author

Mike Mavrigian | Motor Age Editor

Mike Mavrigian has written thousands of automotive technical magazine articles involving a variety of specialties, from engine building to wheel alignment, and has authored more than a dozen books that crisscross the automotive spectrum. Mike operates Birchwood Automotive, an Ohio shop that builds custom engines and performs vintage vehicle restorations. The shop also features a professional photo studio to document projects and to create images for articles and books.