Chevy SPID Label Decoder: Reading the Glove Box Option Label

The SPID label, short for Service Parts Identification, is the sticker GM placed inside many Chevrolets to record how that vehicle was built. It lists the VIN, a block of three-character RPO codes for factory equipment such as the engine, axle ratio, and option packages, and the paint information. On most Chevy trucks, SUVs, and cars built before about the 2018 model year it is on the inside of the glove box door or on a glove box wall; some older cars carried it in the trunk. On newer models, GM moved the option codes into a QR code on the driver-side door pillar. Decoding it means matching each code to its meaning for that model and year, because the label prints codes only, with no descriptions. A VIN lookup can return the vehicle's factory equipment with descriptions when the record is available, and it still works when the label is gone.

Where to find the label

• Glove box: the usual spot on Chevrolet trucks, SUVs, and cars built before about the 2018 model year, either on the inside of the door or on an inner wall. Empty the glove box before deciding there's no label.
• Trunk: some older passenger cars carried it on the underside of the trunk lid or on the spare-tire cover.
• Other interior panels: on certain models it sits under the center console lid or on a rear storage-compartment cover. The owner's manual usually names the location for that vehicle.

How the label is laid out

The design has changed over the years, but most Chevy SPID labels follow the same three-part pattern.

1. Identification at the top. The VIN, sometimes with other production identifiers. Compare it with the windshield and door-jamb VIN before reading anything else, because a label on a replacement glove box door describes a different vehicle.
2. The code grid in the middle. Rows of three-character RPO codes, typically sorted in alphanumeric order rather than grouped by system. That means you scan by letter: axle ratio codes such as GU6 or GT4 sit among the other G codes, and engine codes such as L83 among the Ls.
3. Paint at the bottom. The paint block often notes the paint type, such as BC/CC for base coat and clear coat, along with a WA paint number. Two-tone vehicles can show more than one color entry. For how to use those numbers, see Chevy Paint Code by VIN.

How labels differ from one generation to the next

A label from a 1980s Chevrolet and one from a 2010s Silverado are clearly related, but they don't read the same.

• Older labels were simpler paper stickers with shorter code lists. They fade and flake easily, and on cars that carried them in the trunk they get scuffed by luggage and spare-tire changes.
• Later labels settled in the glove box on most models and carry longer lists, because modern vehicles have codes for electronics, safety systems, market settings, labels, and documentation as well as mechanical equipment.
• Newer vehicles, from around the 2018 model year, generally have no printed SPID grid to read: the option codes are in a QR code on the certification label on the driver-side door pillar. What a scan returns and how to read it is explained in our Chevy QR code RPO decoder.

The codes change too. GM introduces, retires, and sometimes reuses RPO codes, and engine codes belong to specific engine generations. A code you know from one Chevy is a strong hint on another, not proof, so read each one against the model and year in front of you.

Codes owners look for most often

On pickups and full-size SUVs, a handful of codes answer most parts-counter and buyer questions. Meanings vary by model and year, so confirm them against the vehicle's own record.

The RPO code navigator lists thousands more, sorted by first character.

What the label can't tell you

The label is a factory snapshot. It has no descriptions and no prices; original MSRP and option pricing appear only on the window sticker. It doesn't reflect parts changed later, such as a replaced rear axle or a different engine, and it can't show whether package hardware is still on the vehicle. Dealer-installed accessories may or may not appear.

When the label is missing, unreadable, or doesn't match the VIN, run the 17-character VIN through the Chevrolet VIN lookup. It returns the original window sticker when one is available for that VIN, or the RPO build sheet with code descriptions when that record exists; some VINs return neither. If the label and the VIN record disagree, find out why before you rely on either one.