GENERAL MOTORS
DCS7434
URGENT - DISTRIBUTE IMMEDIATELY
Date:

February 12, 2026

Subject: N252541390 - Service Update
Coolant Hose Disconnecting
Models: 2026 Chevrolet Corvette
General Motors is releasing Service Update N252541390 today. The total
number of U.S. vehicles involved is 19.
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
N252541390 Coolant Hose Disconnecting
Release Date:
Attention:

February 2026

Revision:

00

This service update involves vehicles in dealer inventory only and will expire February 28, 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

From
2026

Corvette

To
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

Certain vehicles listed above may have a condition in which the radiator hose clamp is not properly
seated.
Dealers are to inspect, and if necessary, replace the hose clamp on the radiator outlet hose.

Parts
Quantity
As Req’d
As Req’d
As Req’d

Part Name
Clamp
Clamp
COOLANT,ENG (1 GALLON) Dexcool

Part No.
11570871
11601968
12346290

Note: Use the VIN and EPC (Electronic Parts Catalog) to determine which clamp to order.
Warranty Information
Labor
Operation
9108281
9108282

Labor
Time
0.3
2.2

Description
Inspect Only – No Further Action Required
Replace Hose Clamp (includes filling coolant)

Trans.
Type
ZFAT

Net
Item
N/A

Service Procedure
1.

Hoist and raise the vehicle. Refer to Lifting and Jacking in SI.

7080976
2.

Looking through the engine oil drain plug access hole, inspect the hose clamp shown above.

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Service Update
N252541390 Coolant Hose Disconnecting

7080977
Note: The Rear Cradle Shear Plate has been removed in the above picture for graphical clarity only. It does not need to
be removed for inspection.
3.

Verify there is not a bright blue hose clamp release pin connected to the hose clamp as shown above.

4.

Verify no bright blue hose clamp release pins can be seen elsewhere along the radiator outlet hose.

5.

If there is NOT a bright blue release pin attached to the coolant hose, no further action is required. If the bright blue
release pin IS present, proceed to the next step.

6.

Remove the Rear Cradle Sheer Plate. Refer to Rear Cradle Sheer Plate Replacement in SI.

7.

Place a drain pan beneath the vehicle and disconnect the hose to drain.

8.

Install the NEW hose clamp.

9.

Fill the cooling system. Refer to Cooling System Draining and Filling in SI.

10. Reinstall the Rear Cradle Shear Plate. Refer to Rear Cradle Shear Plate Replacement in SI.
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.
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.
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Service Update
N252541390 Coolant Hose Disconnecting
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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