GM RPO codes by VIN — every option code GM recorded

RPO stands for Regular Production Option: the three-character code GM gives each factory option on a Chevrolet, GMC, Cadillac or Buick, from the engine and the axle ratio to the paint, the interior trim and each package. Together, a vehicle's RPO codes are its build specification, which is why parts counters and body shops ask for them.

Partly. The Service Parts Identification label, usually inside the glovebox, prints the RPO codes, but on older vehicles it is often faded, peeled or missing. GM's own window sticker is free for most 2022 and newer vehicles (and some 2021s) and names the options, but not every code. The factory build sheet lists every RPO code GM recorded for the VIN, older vehicles included, for $7.99, and you are only charged if it exists.

On most GM trucks and SUVs it is the Service Parts Identification label on the inside of the glovebox door. On some cars it is in the trunk, on the spare-tire cover or in the center console. It lists the VIN and a block of three-character codes. From the 2018 model year GM also prints a QR code on the certification label on the driver-side door pillar (on a Corvette, on the driver's door); GM says it carries many of the codes, the paint code included, but not all of them.

GM records the exterior paint as an RPO code, so it appears on the glovebox label and in the build sheet with the rest of the codes. The build sheet also names the factory color.

GM has reused some RPO codes over the decades, and a description can come from an older use of the same code. On a 2014-on truck, for example, L83 is the 5.3L V8, even where the description reads like the 1980s engine of the same code. The code is the record; check any surprising description against the vehicle.

Chevrolet, GMC and Cadillac, which returned build sheets for most of the US vehicles we tested. Buick returned nothing in our tests, so we don't sell it; for a 2022-on Buick, GM's free window sticker is the best record.

$7.99 per vehicle, with no account. The amount is only authorized on your card and taken once the build sheet arrives. If GM's record isn't on file, the authorization is released and you pay nothing.