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.
Feb 27, 2017 at 8:07 PM
STRAILER
CAR REPAIR CONTRIBUTOR
54,249 POSTS
Nice work WRENCHTECH :)
Best, Ken
Feb 27, 2017 at 10:45 PM
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.