[dgraves]

A company code won't do you any good Kahlis, you also have to have an account username and password.
I have used the GM Supplier discount, on average you save about $2000 - $3000. I have seen Corvettes that the supplier discount was nearly $8000. You can log on and search dealer inventory and look at the supplier price. You can also share the discount... the following is directly from the gm site.

Now, every time you purchase a new GM vehicle with your GM Supplier Discount, you can pass along supplier pricing to a friend or family member for up to one year from your vehicle purchase date.

How does it work?
After you purchase your new GM vehicle, you will receive a confirmation email stating that you're eligible to pass along the savings to a friend or family member. Then, follow the steps below:

Gather your referral's date of birth, the last four digits of their Social Security number and your Company Code
Select "Obtain Authorization" under "Share Your Discount" from the left navigation bar and follow the prompts
Once you obtain an authorization number, your friend or family member will have six months to use it