What is a window sticker?

A window sticker — officially the "Monroney label" — is the printed sheet the factory attaches to the window of every new vehicle. It has been federally required on new cars in the United States since the Monroney Act of 1958, and decades later it remains the single most authoritative summary of how a particular vehicle left the assembly line.

It lays out the standard equipment, the optional equipment and packages the original buyer selected, the EPA fuel-economy ratings, the warranty terms, the percentage of U.S./Canadian parts content, and the full price breakdown — base MSRP, each individual option, the destination charge, and the grand total. That original data is exactly what lets you confirm, years later, how a used vehicle was really configured.

Window sticker vs. build sheet

The two documents describe the same factory configuration in different ways. A window sticker is written for the buyer: plain equipment descriptions, fuel-economy ratings, warranty details, and a price breakdown right down to the destination charge.

A build sheet is the factory's own assembly record — the complete list of option codes a vehicle was built with, without pricing. WindowStickerVin.com returns the window sticker whenever one is on file, and automatically falls back to the build sheet when it isn't, so you always come away with the underlying factory data either way. For a deeper comparison, see our guide on window sticker vs. build sheet.

Why check your window sticker or build sheet?

Whether you're buying a used car, selling one, arranging insurance, or just settling a curiosity, the factory record is the most reliable way to confirm exactly how a vehicle was equipped the day it was built — far more dependable than a listing description or a faded memory.

It lets you verify the trim level, the engine and drivetrain, the option packages, and individual features, and it makes it easy to tell factory-installed equipment apart from anything a dealer or previous owner added afterward. For buyers especially, it's a quick way to make sure a seller's claims actually match how the vehicle left the line.

VIN report and dealer description disagree on 4A4

Interior & Comfort · 2018 GMC Canyon · 260 views · 3 replies Solved

4A4 — Interior trim: Jet Black/Dark Pewter. This code identifies the factory upholstery material, color combination, or interior trim specification. Browse RPO codes →

Steve W. Jun 26, 2026 · Illinois

I asked the parts department about 4A4 on my 2018 GMC Canyon, but they could not give a clear answer. The decoder lists “Interior trim: Jet Black/Dark Pewter. This code identifies the factory upholstery material, color combination, or interior trim specification” What vehicle details are needed to resolve the meaning correctly?

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3 replies

Grace W. Jun 30, 2026

That code should be read as a factory configuration identifier, not necessarily a guarantee of a separate dashboard control. Some equipment operates automatically or is bundled with another system.

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Evan J. Jul 5, 2026 Accepted answer

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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Jessica P. Jul 5, 2026

A window sticker is helpful for customer-facing option names, while the build sheet is usually more detailed. If they disagree, the vehicle-specific dealer equipment list can help connect the sales name to 4A4.

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