2020 GMC Sierra 2500HD Paint Color Codes & Touch-Up Guide

Whether you are fixing a few rock chips from hauling heavy loads or tackling a minor scratch on the tailgate, finding the exact factory paint color for your heavy-duty truck is the first step to a flawless repair. This guide provides a comprehensive overview of the factory paint options for the 2020 GMC Sierra 2500HD, along with tips on where to find your code and how to apply touch-up paint like a pro.

Quick reference

Below is a quick reference guide to the factory paint colors offered for the 2020 GMC Sierra 2500HD. Please note that GMC often uses both a three-character RPO code (like GAZ) and a four-digit "WA" code (like WA8624) for the same color. Always verify with your specific truck's label.

If you are uncertain about your specific color variant, always confirm your code via your VIN at a local GM dealer or through a reputable paint supplier.

Where to find your paint code

General Motors transitioned how they display paint codes on newer models. For your 2020 GMC Sierra 2500HD, the days of the old "Service Parts Identification" (SPID) sticker in the glove box are mostly gone.

Instead, open your driver’s side door and look at the B-pillar or the door jamb. You will find a silver or black certification label that contains a QR code.

• Look towards the bottom of this label for a code preceded by "BC/CC" (Basecoat/Clearcoat) or simply the letters "WA" followed by four digits (e.g., WA8624).
• You may also see the three-digit RPO code (e.g., GAZ) listed nearby.
• If the sticker is faded, damaged, or missing, simply call a local GMC dealership parts department with your Vehicle Identification Number (VIN), and they can give you the exact paint code within seconds.

Best touch-up paint sources

Getting the right paint is crucial for an invisible repair. Here are the top sources for sourcing your Sierra's exact match:

• Dealership (OEM): Your local GMC dealer sells small 0.5 oz touch-up pens and brushes. These are excellent for tiny rock chips and guarantee an exact factory match.
• AutomotiveTouchup: A highly regarded online supplier that mixes paint exactly to your WA code. They offer larger volumes, including spray cans, which are perfect for larger scratches or replacing a mirror cap.
• Dupli-Color: Available at most local auto parts stores. They offer the "Perfect Match" line. While convenient for common colors like Onyx Black or Summit White, they may not carry specific low-production metallic or tri-coat colors.
• Tcoat custom-mix: Ideal for professional-grade custom blending, especially if your truck's paint has started to fade slightly from prolonged sun exposure.

How to use touch-up paint

Applying touch-up paint requires patience and a steady hand. Follow these steps for the best results:

1. Clean: Thoroughly wash the damaged area with dish soap and water to remove dirt. Follow up with wax and grease remover or rubbing alcohol to ensure the surface is completely stripped of oils.
2. Primer: If the scratch goes all the way down to the bare metal or plastic, apply a thin layer of automotive primer. Let it dry completely.
3. Base Coat: Shake your paint pen or bottle vigorously. Apply the color in very light, thin layers. Do not try to fill the chip in one go. Allow 15-20 minutes of drying time between each coat until the color covers the primer.
4. Clear Coat: The base coat will dry looking dull. To restore the factory shine and protect the paint, apply a layer of clear coat. Once fully cured (usually after a few days), you can lightly polish the area to blend the edges.

Color matching tips for pearls and tri-coats

Colors like White Frost Tricoat and Red Quartz Tintcoat require a specialized three-step process: a solid base layer, a translucent pearl/metallic mid-coat, and a final clear coat.

When touching up these colors, getting the exact depth and sparkle is notoriously difficult. The mid-coat must be applied in incredibly thin, careful layers. Too much mid-coat will make the repair look darker than the surrounding paint, while too little will make it look flat. For larger scrapes involving tri-coats, brush-on paint rarely yields perfect results; spray application or professional blending is highly recommended.

If your 2020 GMC Sierra 2500HD needs more than just a quick touch-up pen, don't leave it to chance. Find a trusted body shop on Repairius.