04-06-04-051H

Bulletin No.:
Service Bulletin
Date:
04-06-04-051H
August, 2023
INFORMATION
Subject:
Maintenance Cleaning of Fuel Injectors and Information Regarding Gasoline Detergent
Additive
Models:
2024 and Prior GM Passenger Cars and Trucks
Attention: This bulletin also applies to any of the following Regions or Countries: North America,
Argentina, Brazil, Bolivia, Chile, Colombia, Ecuador, Paraguay, Peru, Uruguay,
Venezuela, Europe, Uzbekistan, Russia, Middle East, Iraq, Israel, Palestine, Japan,
Cadillac Korea (South Korea), GM Korea Company, China, Taiwan, Thailand,
Singapore, Philippines, Australia/New Zealand, Egypt, Other Africa, South Africa
This bulletin has been revised to add the 2024 Model Year and change Attention statement to
add regions and countries. Please discard Corporate Bulletin Number 04-06-04-051G.
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.
General Motors is aware that some companies are
marketing tools, equipment, and programs to support
fuel injector cleaning as a preventative maintenance
procedure. General Motors does not endorse, support,
or acknowledge the need for fuel injector cleaning as a
preventative maintenance procedure. Fuel injector
cleaning is approved only when performed as directed
by a published GM drivability or DTC diagnostic service
procedure.
Due to variation in fuel quality in different areas of the
country, the only preventative maintenance currently
endorsed by GM regarding its gasoline engine fuel
systems is the addition of GM Fuel System Treatment
PLUS added to a tank of fuel at each oil change.
Regular use of a TOP TIER Detergent Gasoline as
recommended in the owner manual will help prevent
the build-up of intake valve and fuel injector deposits. A
complete list of TOP TIER fuel retailers can be found at
www.toptiergas.com.
This bulletin also introduces two-part numbers for
General Motors global aftermarket detergent fuel
additives. Part Number 88865595, for use in gasoline
vehicles, and 88865596 for Flex Fuel Vehicles (FFVs).
Copyright 2023 General Motors LLC. All Rights Reserved.
Why they need additive:
These fuel additives are for the prevention and removal
of deposits from spark-ignited engines, particularly from
the intake valves, fuel injectors, and the combustion
chamber.
How we came up with this:
General Motors Global Propulsion Systems (GM GPS)
Fuels Group updated GMW17131 with a set of
minimum technical requirements designed to
extensively evaluate additive chemistry, with the intent
to have an effective gasoline detergent specification for
all markets. The above formulations meet, or exceed,
the requirements of GMW17131 and are the products
currently approved. Only approved additive chemistries
can be distributed in the dealer network and used in
General Motors’ vehicles.
When to use - conditions:
These detergent fuel additives should be used when
the vehicle exhibits loss of power, diminished
performance, frequent stalls, or no starts, or when a
noted decrease in fuel economy is observed. Refer to
your owner manual for more information on when the
additive should be used.
How to use the additives:
Detergent fuel additives are to be used following the
instructions in the Owner Manual.
Page 2
August, 2023
Bulletin No.: 04-06-04-051H
Parts Information
Causal
Part
Description
Part
Number
N/A
CLEANER, FUEL
SYSTEM
TREATMENT 12
OZ. (GASOLINE)
U.S.
88865595
(for Canada
use
88865598)
N/A
CLEANER, FUEL
SYSTEM
TREATMENT 12
OZ. (FLEX FUEL)
U.S.
88865596
(for Canada
use
88865599)
Qty
1
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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