GENERAL MOTORS
DCS7378
URGENT - DISTRIBUTE IMMEDIATELY
Date:

November 12, 2025

Subject: N252527500 - Service Update
Rear Spring U-Bolt Nut Low Torque
Models: 2025-2026 Chevrolet Silverado 2500/3500 HD
General Motors is releasing Service Update N252527500 today.
What Should Dealers Do: Dealers should review IVH, or the Dealer Maxis reports
for open VINs in their inventory. Dealers can view the attached bulletin, and it
will also be displayed in Service Information tomorrow.
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.
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
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.
END OF MESSAGE

Service Update
N252527500 Rear Spring U-Bolt Nut Low Torque
Release Date:
Attention:

November 2025

Revision:

00

This service update includes vehicles in dealer inventory and customer vehicles that return to the
dealership for any reason. This bulletin will expire November 30, 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
Chevrolet

Model
Silverado 2500/3500 HD

From
2025

To
2026

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

Certain vehicles listed above may have a condition in which the Rear Spring U-bolt fasteners are torqued
below specification.
Dealers are to torque both the right and left side Rear Spring U-bolt fasteners to specification.

Parts
There are no parts required for this repair.
Warranty Information
Labor
Operation
9108200

Labor
Time
0.5

Description
Torque Rear Axle U-Bolt Nuts

Trans.
Type
ZFAT

Net
Item
N/A

Service Procedure
1.

Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI.

2.

Support the rear axle assembly with the proper jack stand.

5286804

3.

Loosen but do not remove all 8 Rear Spring U-bolt Nuts(1).

4.

Tighten the 4 left Rear Spring U-bolt Nuts in a crisscross pattern in the following sequence:

5.

•

First Pass: 130 Nm (96 lb ft)

•

Second Pass: Loosen 270 degrees

•

Third Pass: 130 Nm (96 lb ft)

•

Final Pass: 180 degrees

Repeat the above procedure for the 4 right Rear Spring U-bolt Nuts.
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Service Update
N252527500 Rear Spring U-Bolt Nut Low Torque
Dealer Responsibility
Whenever a vehicle subject to this service update enters your vehicle inventory or is in your facility for service through
the end date as noted in the Attention box, you must take the steps necessary to be sure the service update correction
has been made before selling or releasing the vehicle.
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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