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.

Can a window sticker confirm 3F9?

Interior & Comfort · 2024 GMC Sierra 1500 · 379 views · 2 replies

3F9 — Seat belt: Front, Red. This code identifies a factory seat, restraint, upholstery, or seating-layout feature. Browse RPO codes →

Kate E. Jul 12, 2025 · Wisconsin

I am trying to document the original configuration of a 2024 GMC Sierra 1500. Code 3F9 is shown as “Seat belt: Front, Red. This code identifies a factory seat, restraint, upholstery, or seating-layout feature” Which source is usually most reliable when the build sheet, window sticker, and dealer printout do not use identical wording?

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2 replies

Jeff W. Jul 18, 2025

For a retrofit, check the modules, wiring connectors, software configuration, and compatible part numbers first. Installing the visible component alone may not make the feature operational.

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Evan W. Jul 22, 2025

This sounds more like a documentation mismatch than a decoder error. Different databases often shorten the same factory description in different ways.

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#rpo
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#3f9