What is a GM build sheet?

A build sheet is General Motors' own factory assembly record for a specific VIN. It lists the RPO (Regular Production Option) codes the vehicle was built with — every package, individual option, paint and trim selection, axle ratio, and equipment group — exactly as it left the plant.

Where a window sticker is written for the buyer with plain descriptions and pricing, the build sheet is the underlying code-level truth. It's the most reliable way to confirm how a used Chevrolet, Buick, Cadillac, or GMC was originally configured, long after the original paperwork is gone.

Window sticker vs. build sheet

Newer GM vehicles (roughly 2020 and later) usually have the original window sticker PDF on file — the Monroney label with standard and optional equipment, fuel economy, warranty, and the full MSRP breakdown.

When a window sticker isn't on file, this tool automatically falls back to the build sheet: the list of RPO codes with their descriptions. Either way you come away with the factory record of how the vehicle was equipped.

RPO codes explained

Every factory option on a GM vehicle has a three-character RPO code — for example a specific paint, a tow package, a sunroof, or an audio system. These codes are also printed on the label inside the glovebox or spare-tire well.

The build sheet pairs each code with a readable description, so you can translate a glovebox full of codes into the actual packages and features the vehicle carries. That makes it easy to verify a seller's claims or settle exactly which options are factory.

Does 3DO confirm my 2021 GMC Canyon was built with this option?

Interior & Comfort · 2021 GMC Canyon · 822 views · 2 replies Solved

3DO — Instrument panel trim: Mystic Bronze Tricoat Polycarbonate. This code identifies a factory color, finish, or component used on the instrument panel or instrument cluster. Browse RPO codes →

Amanda Y. Jul 7, 2026 · Michigan

I received a VIN equipment report for a 2021 GMC Canyon, and 3DO is listed as “Instrument panel trim: Mystic Bronze Tricoat Polycarbonate. This code identifies a factory color, finish, or component used on the instrument panel or instrument cluster” Before I order parts, I want to confirm that the code reliably identifies the original configuration.

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2 replies

Kyle P. Jul 12, 2026 Accepted answer

The wording may be abbreviated because these were originally production codes rather than consumer descriptions. “Instrument panel trim: Mystic Bronze Tricoat Polycarbonate. This code identifies a factory color, finish, or component used on the instrument panel or instrument cluster” is a reasonable plain-English reading, but the exact implementation should be verified for the 2021 model.

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Nicole P. Jul 16, 2026

A clear photo of the build label, VIN report, and the relevant component would help. Do not post the full VIN publicly; the last eight characters are normally enough for a parts-counter discussion.

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