GENERAL MOTORS
DCS7426
URGENT - DISTRIBUTE IMMEDIATELY
Date:

February 9, 2026

Subject: REVISION: A252528630-03 - Service Update
Fuel Injector Flow Rate
Revised Warranty, Procedure, Parts sections
Models: 2025-2026 Buick Envista
2025-2026 Chevrolet Trax
This bulletin has been revised to remove information regarding injector
replacement, as Engine Control Module reprogramming is the only remedy for
this field action. Please discard all previous copies of bulletin A252528630.

END OF MESSAGE

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

Attention:

February 2026

Revision:

03

This bulletin has been revised to remove information regarding injector replacement, as
Engine Control Module reprogramming is the only remedy for this field action. 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

Envista
Trax

From
2025
2025

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 reprogram the engine control module.

Parts
No parts are required for this repair.
Warranty Information
Labor
Operation
9108079*
9108080*

Description
Verified Module Software or Calibration Level: Module Is
Programmed with Same Level Software or Calibration
Engine Control Module Reprogramming with SPS

Labor
Time
0.2

Trans.
Type
ZFAT

Net
Item
N/A

0.3

ZFAT

N/A

Important: * To avoid warranty transaction rejections, carefully read and follow the instructions below:

6125814

•

The Warranty Claim Code from the programming event must be accurately entered in the “Warranty Claim
Code” field of the transaction.

•

When more than one Warranty Claim Code is generated for a programming event, it is required to document all
Warranty Claim Codes in the “Correction” field on the job card. Dealers must also enter one of the codes in the
“Warranty Claim Code” field of the transaction, otherwise the transaction will reject. It is best practice to enter
the FINAL code provided by SPS2.

•

For more information about Warranty Claim Codes and retrieving a lost code, refer to 25-NA-281 Information on
SPS Warranty Claim Code Submission and Retrieval in SI.

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Service Update
A252528630 Fuel Injector Flow Rate
Service Procedure

7001095
IMPORTANT: The service technician always needs to verify that the VIN displayed in the left side drop down menu (1)
and the top center window (2) match the VIN plate of the vehicle to be programmed prior to using Service Programming
System 2 (SPS2) for programming or reprogramming a module.
IMPORTANT: Failure to follow all notes and cautions within the programming and setup document may result in
programming errors.
Caution: Before downloading the update files, be sure the computer is connected to the internet through a network
cable (hardwired). DO NOT DOWNLOAD or install the files wirelessly. If there is an interruption during programming,
programming failure or control module damage may occur. (Use when applicable)
1.

Reprogram the Engine Control Module. Refer to Engine Control Module: Programming and Setup in SI. Carefully
read the programming and setup document for further instruction.

7001097
Important: To avoid warranty transaction rejections, you MUST record the warranty claim code provided on the Warranty
Claim Code (WCC) screen shown above on the job card. Refer to call out 1 above for the location of the WCC on the
screen.
2.

Record SPS Warranty Claim Code on job card for warranty transaction submission. Refer to 25-NA-281 Information
on SPS Warranty Claim Code Submission and Retrieval in SI.

Note: Clear DTCs after programming is complete. Clearing powertrain DTCs will set the Inspection/Maintenance (I/M)
system status indicators to NO.
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 In-Service
Page 2 of 3

Service Update
A252528630 Fuel Injector Flow Rate
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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