The GMT800 RPO Decoder is a free, no-login tool for decoding the factory build sticker on 1999–2006 GMT800-platform trucks and SUVs — Silverado, Sierra, Tahoe, Yukon, Suburban, Avalanche, and Escalade. Type in or photograph your RPO codes and it instantly tells you exactly how your truck was built at the factory.
The database contains 15,000+ RPO codes covering engines, transmissions, axle ratios, suspension packages, colors, electronics, and dozens of other option categories. It's the most comprehensive free GMT800 RPO reference available online.
Your RPO sticker is typically located inside the glove box door on GMT800 trucks, or on a sticker inside the driver's door jamb. It lists two- or three-character codes separated by spaces. Photograph the sticker or type the codes into the decoder — results appear instantly, grouped by category.
You can export your decoded results as a PDF, Excel spreadsheet, or CSV file.
This tool is built and maintained by Murmor, an independent publisher of niche information sites. It's a passion project — GMT800 trucks are genuinely great, and the factory RPO system is more useful than most owners realize.
This site is not affiliated with, endorsed by, or connected to General Motors. All RPO data is provided for reference and educational purposes only.
Questions, corrections, or missing codes? Email hello@murmor.net.