This site is pretty accurate:My tahoe's glovebox sticker is all smudged up and I need my rpo codes for brakes and an axle replacement coming up soon. I tried going to my local GM dealer and asking for its sheet but they only go as far back as 2003. That's great if I have an 03 but my Tahoe is a 99. Is there any way I can find the RPO codes on the vehicle? I have the original window sticker but its really just a collectors item at this point.
VIN decoder & lookup - Vindecoderz
Get the complete vehicle history report with owner information, prior accidents and damage.
www.vindecoderz.com
Just input your VIN and it outputs information including your RPO codes.