Bulletin No.: 23-NA-016

Service Bulletin

Date: August, 2024

INFORMATION
Subject:

Brand:

GMC

Repair and Care Information on available Low Gloss Matte Paint Finishes

Model:

HUMMER EV Pickup
HUMMER EV SUV

Involved Region or Country

Model Year:
from

to

from

to

2024

2025

-

-

Engine:

Transmission:

All

All

North America and Middle East

GMC HUMMER EV Low-Gloss Matte Paint
Finish Description
Important: Service agents must comply with all
International, Federal, State, Provincial, and/or
Local laws applicable to the activities it performs
under this bulletin, including but not limited to
handling, deploying, preparing, classifying,
packaging, marking, labeling, and shipping
dangerous goods. In the event of a conflict
between the procedures set forth in this bulletin
and the laws that apply to your dealership, you
must follow those applicable laws.
Important: This technical service bulletin (TSB) can
only be completed by certified repair facilities who have
met all specific training, tool and equipment requirements pertaining to the vehicle Brand and Model
serviced. Repairs must be performed by a technician
who has successfully completed the required training.
Starting with 2024 HUMMER EV SUV Edition 1, GMC
will offer a low gloss matte paint finish.
HUMMER EV’s matte finishes are completely unique
from other automotive paints and require specific care.
Typical gloss paints employ a durable clearcoat finish
that reflects light, leaving a bright sheen. A matte finish,
by contrast, uses a distinct coating, equally as durable,
that diffuses and absorbs light, creating a unique “flat”
finish. While the clear topcoat chemistry is the same
high quality clear used for the high gloss vehicles,
special care must be taken to preserve its unique low
gloss appearance.

Copyright 2024 General Motors. All Rights Reserved.

VIN:

Important: Do not use automatic car washes with
brushes. Brushed car washes can cause light
scratches in the paint which cannot be buffed out. GM
recommends a touchless automatic car wash or hand
washing only.

Repair
Paint Chips (Touch Up) Minor paint chips can be
repaired with the available matte paint touch up paint
pen available through the parts department. Do Not
Use Aerosol Can (General Motors Will Not Offer)
Scratches and Scuffs:
• DO NOT attempt to buff out scratches or
scuffs. Doing so will polish the matte paint reducing
or eliminating the matte finish appearance.
• The only way to correct this type of damage is to
have the panel repainted.
• Repair Complete Panel
• Use Axalta authorized Matte refinish paint repair
system only.
• Do Not Dry in a Heated Booth (But Booth must be
Dust Free)
• Use Inferred Heaters only (Not exceed 140
Degrees Fahrenheit 20 minutes max)
• RESS/High Voltage Battery Shall NOT exceed 105
Degrees Fahrenheit Max

Page 2

August, 2024

Bulletin No.: 23-NA-016

Care and Handling

Removing Natural Stains and Road Debris

The matte finish requires special care during the PreDelivery Inspection (PDI) as well as by customers in
order to maintain its unique appearance. Dealerships
that receive a HUMMER EV with the matte finish are
required to have a sales and service point of contact to
ensure the proper paint care requirements are followed.

1. Spray the affected area with water to remove any
loose debris.
2. Dampen remaining debris with tar remover and
allow it to soak.
3. Apply tar remover to a damp microfiber towel.
4. Wipe vehicle finish lightly to remove debris.

Pre-Wash Spot Cleaning
Before washing your entire vehicle, thoroughly inspect
your vehicle for areas of heavy soiling or spots. Wash
these areas first by following these spot cleaning guidelines.

5. Once debris is removed, wash with a matte paint
finish soap using a damp microfiber cloth, then
rinse well with water.
6. Dry with a clean, damp microfiber cloth.

Removing Tar or Tree Sap
Equipment/Supplies for Spot Cleaning

1. Spray the affected area with water to remove any
loose debris.

• Alcohol based window cleaner (non-vinegar or
ammonia based), matte paint cleanser, or a
solution of 50% alcohol/50% deionized water.

2. Spray the area with an alcohol-based window
cleaner or a solution of 50% alcohol/50%
deionized water.

• Bug and tar remover or road debris solvent (if
needed)

3. Spray cleaning product on damp microfiber towel.

• Clean microfiber soft cloth
• Optional: Pressure washer with fan tip and
pressure below 1,200 psi (Pressure washing is the
best way to remove heavy soiling before washing
your vehicle. Use a wide fan tip and hold it at least
10 inches from the paint.)

Recommended Spot Cleaning Procedure
1. Apply cleaner to cloth and surface to be cleaned
(refrain from wiping a dry towel on the affected
area, as this will damage the finish).

4. Wipe car finish lightly to remove debris.
5. Dry with a clean, damp microfiber soft cloth.

Tires and Wheels
If you wish to clean the tires and wheels, do this before
washing your GMC. Follow these guidelines:
• Refrain from using the same wash mitt used to
clean your vehicle’s matte finish.

2. Soak the area to be cleaned.

• Use separate microfiber cloths and products
developed specifically for cleaning coated alloy
wheels and tires; follow the manufacturer’s instructions.

3. Lightly wipe the surface in a light forward and
backward motion; avoid circular motions, which
can alter the finish.

• Avoid applying any tire or wheel cleaner on the
matte finish; if this happens, wash and rinse this
area immediately.

4. Immediately rinse with water to thoroughly remove
the cleaning product.
Note: Always test products in a hidden area before
applying to a visible area.

Bulletin No.: 23-NA-016

August, 2024

Equipment/Supplies for Normal Car Wash
Process
• Dedicated car wash product such as Adams Car
Wash GM PN 19355475 (U.S.) (made without
added wax or polishes / pH neutral)
• Dedicated car wash product (made without added
wax properties)
• Soft, clean car wash mitt or wash pad
• Two buckets with dirt separators (grit guards) at
the bottom
• Hose and sprayer with shut off nozzle
• Microfiber cloth
• Chamois cloth, for drying

Page 3

Wash and Dry Procedure
1. Park your vehicle out of direct sunlight in a cool,
shaded area.
2. Prepare one bucket (with dirt separator grid at the
bottom) with car wash solution and water,
according to manufacturer’s recommendations.
3. Prepare a second bucket with clean water, for
use in rinsing the wash mitt. Always rinse the mitt
first, placing only a clean mitt into the wash
solution.
Drying For Best Appearance: Dry your vehicle with a
clean damp chamois or microfiber towel. Do not allow
finish surface to air dry, as air drying will allow water
spots to form. If finish surface starts to air dry, continue
dampening these areas until you are able to hand dry.

Version

4

Modified

Released March 27, 2023
Revised April 06, 2023 — Updated Drying and Repair Information.
Revised April 30, 2024 – Added 2025 Model Year.
Revised August 13, 2024 – Added HUMMER EV Pickup.

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these
technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper
service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job
properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your
vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the
information.

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