Repair Safety Notice:
This information is for general instructional purposes only. Vehicle repair can be dangerous.
Verify all information, follow manufacturer service procedures, use proper tools and safety equipment,
and consult a qualified repair shop when needed.
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STRAILER
AUTOMOTIVE REPAIR CONTRIBUTOR
54,178 POSTS
Do not know. what context are you seeing it in?
Feb 27, 2017 at 7:05 PM
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WRENCHTECH
AUTOMOTIVE REPAIR CONTRIBUTOR
20,761 POSTS
Those are the 3 digit production codes that identify the systems and features that a GM car is equipped with. You will find a placard with a list of them, usually in the glove box.