GENERAL MOTORS
DCS7408
URGENT - DISTRIBUTE IMMEDIATELY
Date:

January 7, 2026

Subject: REVISION: A252528630-01- Service Update
Fuel Injector Flow Rate
Population Expansion
Models: 2025-2026 Buick Envista
2025-2026 Chevrolet Trax

This bulletin has been revised to add the 2025 model year to the population.
Please discard all previous copies of bulletin A252528630.
The Stock VIN list of vehicles in dealer inventory or in-transit is attached to this
message. Note: this list is only accurate at the time of report creation and all
VINs should be validated in IVH prior to repair.

END OF MESSAGE

Service Update
A252528630 Fuel Injector Flow Rate
Release Date:
Revision Description:
Attention:

January 2026

Revision:

01

This bulletin has been revised to add the 2025 model year to the population. Please
discard all previous copies of bulletin A252528630.

This service update involves vehicles in dealer inventory only and will expire January 31, 2027.
Investigate Vehicle History (IVH) in the GM Global Warranty Management system MUST always
be checked to confirm vehicle involvement and MUST be in OPEN status prior to beginning any
required inspections and/or repairs. DO NOT use Service Information with VIN search, as it will
not verify the VIN eligibility for field actions.
Model Year

Make

Model

Buick
Chevrolet

From
2025
2025

Envista
Trax

To
2026
2026

This service update should be performed on vehicles in dealer inventory only. Investigate Vehicle History (IVH) in the
GM Global Warranty Management system MUST always be checked to confirm vehicle involvement and MUST be in
OPEN status prior to beginning any required inspections and/or repairs. DO NOT use Service Information with VIN search,
as it will not verify the VIN eligibility for field actions.
Condition
Correction

On certain vehicles listed above, under certain driving conditions and due to differences in flow rate
characteristics, the fuel injectors may not be able to properly optimize engine fueling.
Dealers will replace the engine’s three fuel injectors.

Parts
Quantity
3
1
1
3
As
Required

Part Name

Part No.
25207703
55487546
55490170
55492928
12346290
(US)
10953464
(CA)
Obtain locally
in compliance
with GM spec
GMW3420 for
Dexcool
concentrate
and GM Spec
GMW18270
for premix
50/50 Dexcool

INJECTOR ASM-DIR FUEL
GASKET-CM/SHF CVR
PIPE ASM-FUEL FEED INTER
RETAINER-F/INJR
COOLANT

If you have one of the involved vehicles, you must place a CSO order and add a SPAC case with the appropriate VIN.
Due to limited inventory, VIN Verification will be conducted on the vehicle identification number you input and if it isn’t an
OPEN Recall in IVH then the order will be cancelled daily.
Reminder: Parts may be removed from Retail Inventory Management (RIM). Dealers should review the affected parts to
confirm RIM managed status. Parts may have quantity limiters in effect.
Warranty Information
Labor
Operation
9108231

Description
Fuel Injector Replacement (3)

Labor
Time
2.5

Trans.
Type
ZFAT

Net
Item
N/A

Service Procedure
Replace the fuel injectors. Refer to Direct Fuel Injector Replacement in SI.

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Service Update
A252528630 Fuel Injector Flow Rate
Dealer Responsibility
Dealers must take the steps necessary to ensure that the service update correction has been made to all involved vehicles
in dealer inventory before selling or dealer-trading the vehicle, but no later than the end date as noted in the Attention
box.
All new, used, GM Certified Pre-Owned (CPO), courtesy transportation vehicles, dealer shuttle vehicles, CarBravo, etc.
in dealers' possession and subject to this field action must be held and inspected/repaired per the service procedure of
this bulletin before customers take possession of these vehicles. Involved vehicles must be held and not delivered to
customers, dealer-traded, released to auction, used for demonstration, or any other purpose.
All GM Certified Pre-Owned (CPO) vehicles currently in the dealers’ inventory within the SHIFT Digital system will be
de-certified and must be held and remedied per the service procedure in this bulletin. Upon submitting an accepted/paid
warranty transaction in the Global Warranty Management (GWM) system, the vehicle can be re-certified for sale within
the SHIFT Digital system, or once again be used in the Courtesy Transportation Program.
Dealer Reports – For USA and Export
The Inventory tab of the Open Vehicle Report will contain Service Update Bulletin VINs that apply to this field action.
This information is intended to assist dealers with the PROMPT COMPLETION of these vehicles. The Customer InService tab will not contain Service Update Bulletin VIN data because the intent of a Service Update Bulletin is to not
inconvenience a customer with a special trip for service. Service Update Bulletins are to be completed when the
customer is in for a regularly scheduled visit.

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 tools, equipment, 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 dealer for information on whether your
vehicle may benefit from the information.

We Support
Voluntary Technician
Certification
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