Seller says this vehicle has the 4AX option

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.

Seller says this vehicle has the 4AX option

Interior & Comfort · 2022 Buick Encore GX · 999 views · 1 reply

4AX — Interior trim: Jet Black/Inferno Orange. This code identifies the factory upholstery material, color combination, or interior trim specification. Browse RPO codes →

Nick S. Feb 29, 2024 · Tennessee

A dealer listing references 4AX on a 2022 Buick Encore GX. The decoded description is “Interior trim: Jet Black/Inferno Orange. This code identifies the factory upholstery material, color combination, or interior trim specification” Is the build sheet normally enough for a pre-purchase check, or should I confirm it another way?

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Evan M. Mar 5, 2024

Before buying, I would inspect the relevant component and take a photo of its label or part number. That often resolves whether the vehicle still has the factory configuration associated with 4AX.

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