1SQ versus another similar code on Chevrolet Suburban

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.

1SQ versus another similar code on Chevrolet Suburban

Packages & Towing · 2023 Chevrolet Suburban · 1,134 views · 1 reply

1SQ — Option package 15. This code identifies a factory option package; its exact contents may vary by model and model year. Browse RPO codes →

Monica S. Oct 16, 2024 · Virginia

I have seen 1SQ described as “Option package 15. This code identifies a factory option package; its exact contents may vary by model and model year” but another database uses slightly different wording. Is this normally because the meaning changes by platform, market, or model year?

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Nina A. Oct 20, 2024

I would avoid buying retrofit parts until the connectors and module support are confirmed. Returning electronic or VIN-programmed components can be difficult.

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