Contact your employer's human resources department to determine if your company is eligible for the supplier discount. If so, you'll need your company's company code.
Go to the GM Supplier Discount website to obtain your personal discount authorization number. Choose the "New to This Site?" option to submit your information. Submit your personal information by completing all fields.
Choose a user name, password, secret question and answer. Enter in the company code you received from your employer. Choose the name of your company from the drop-down menu and wait for your confirmation email.
Click on the link provided in your confirmation email. Click on "Obtain Authorization" from the left hand menu of the website and complete all fields, which confirms the information you previously submitted. Choose a local dealer from the list generated by your Zip Code.
Verify your business and personal information on the next page. Agree to the terms and conditions and continue to the next step. Write down your authorization number or print it from the authorization email, which you'll receive shortly after.
Call the GM dealer you want to purchase from to ensure the dealer participates in the program. If so, visit the dealer with your authorization number to obtain your discount. The dealer will confirm that your identification matches the information you submitted to obtain the authorization number.