RPO codes are the three-character option codes GM uses for every factory option on Chevrolet, GMC, Buick and Cadillac vehicles. Decode the VIN below, then use this guide to find and read the RPO codes.
What a GM VIN tells you
Every GM built since 1981 has a 17-character VIN. The first three characters (the World Manufacturer Identifier) show who built it and where; characters 4–8 describe the model, body and engine; the 10th character is the model year; the 11th is the assembly plant; and the last six are the vehicle’s serial number.
| VIN starts with | Usually means |
|---|---|
| 1G | GM built in the United States |
| 2G | GM built in Canada |
| 3G | GM built in Mexico |
Prefixes are a general guide. The decoder above reads the full VIN for the exact details.
What are GM RPO codes?
RPO stands for Regular Production Option. Each code is three letters or numbers, and together they describe the engine, transmission, axle, paint, trim and packages a vehicle was built with. They are printed on the Service Parts Identification (SPID) label, usually in the glovebox, on the center console lid or in the spare-tire area. A GM dealer can also print the full RPO list from the VIN.
Common GM RPO codes
| Code | Meaning |
|---|---|
| Z71 | Off-road package (trucks and SUVs) |
| G80 | Automatic locking rear differential |
| Z51 | Performance package (Corvette, Camaro) |
| ZR2 | Off-road performance trim (Colorado, Silverado) |
| L86 | 6.2L V8 engine (trucks and SUVs) |
| LT1 | 6.2L V8 engine (Camaro, Corvette) |
Where to find the VIN on a GM
- On the dashboard on the driver’s side; look through the bottom of the windshield
- On the label inside the driver’s door frame
- On the title, registration card and insurance card
Frequently asked questions
Can I get RPO codes from the VIN alone?
The VIN doesn’t contain RPO codes directly, but GM dealers and some services can look up the full list from the VIN. The SPID label in the vehicle shows them too.
Where is the RPO label on a Silverado?
Usually on the inside of the glovebox door. On some trucks it’s on the center console lid.
Are RPO codes used on Ford or Toyota?
No. RPO codes are GM-specific. Other brands use their own option and sales codes.