Download a complete GM build sheet from www.compnine.com. You get yout build info, codes, definitions for that car plus any 4 others at later dates.

There are also several VIN decoder sites - Google it.

 

Vin position 4 will be "A" and 5 will give you series.

 

Your next adventure will be finding your options or RPO codes. Pull up the trunk liner and you’ll see a plate by the spare tire well that has your VIN and a complete list of RPO codes. I took a picture of mine and just keep it handy in case I see something in doco that references an RPO code like “for G80 equipped cars, do X; otherwise do Y.”

 

ok So I figured out that I have a Sedan. But now I am wondering what you mean by rpo codes and what do they do? I will google it but woukd like to hear from a human. If u have time i am very interested thank you sir

 

RPO is an acronym for Regular Production Option. Options could be the style of wheels, body color, heated seats, particular engine, etc. They're all listed on a sticker where @luxuryrules indicated. Or as @Submariner409 said, you can get a build sheet that lists all of the RPO codes for your specific VIN, along with the meaning of the code (see below). Some websites offer them for sale. The parts department at your local dealership may also provide you one, often for no fee. There used to be a way to get one via email directly from GM, but they ended that service a couple of years ago.

Each code has a specific meaning. Not specific to your vehicle, but (generally) specific within all GM vehicles. Every once in a while some codes may change meaning, but they're pretty consistent. Using the RPO code is an easy way to reference something - for example, there have been discussions where the suspension is the topic and people will refer to RPO code FEx, where x is some number indicating the type of suspension.

This is a snippet from the build sheet for the wife's '13 ATS. The three character alphanumeric values (e.g. 1SU and 4C2) are the RPO codes that define the features of her vehicle.

 

Post a photo of front. If you have HID headlights with lights on the bottom, it's
Prem Luxury or Performance. If not, it's standard or luxury.

Luxury trim had the most volume.