GENERAL MOTORS
DCS 7437
URGENT - DISTRIBUTE IMMEDIATELY
Date:

February 16, 2026

Subject: N252536560 - Service Update
Pressure Relief Valve Leak
Models: 2026 Silverado 1500
2026 Silverado 2500 HD/3500 HD
2026 Sierra 1500
2026 Sierra 2500 HD/3500 HD
General Motors is releasing Service Update N252536560 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
N252536560 Pressure Relief Valve Leak
Release Date:
Attention:

February 2026

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 February 29, 2028.
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
Chevrolet
GMC
GMC

Model
Silverado 1500
Silverado 2500 HD/3500 HD
Sierra 1500
Sierra 2500 HD/3500 HD

From

To

2026

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 experience water intrusion due to a hole in the cabin Pressure Relief
Valve.
Dealers are to seal the hole using RTV sealant.

Parts
Quantity
As Req

Part Name
ACDelco RTV

Part No.
*

*Any ACDelco or Aftermarket RTV is acceptable for this repair
Warranty Information
Labor
Labor
Trans.
Net
Operation
Description
Time
Type
Item
9108284
Inspect Only – No Further Action Required
0.2
ZFAT
N/A
9108285
Inspected – Found Holes in Cabin Vent – Plugged with RTV
0.3
ZFAT
*
*The amount identified in “Net Item” should represent the actual sum total of the current GMCC&A Dealer net price for
RTV needed to perform the required repairs, not to exceed $0.05 USD, $0.07 CAD, plus applicable Mark-Up or Landed
Cost (for Export).
Service Procedure

7082902
1.

Locate the Cabin Pressure Relief Vents as shown above. They will be visible looking down between the cabin and
the bed with a flashlight.
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Service Update
N252536560 Pressure Relief Valve Leak

7082903
2.

Inspect the posts at each corner of the Cabin Pressure Relief Vents (both sides) to see if any of them have a hole
as shown above.
a.

If there are no holes, no further action is required.

b.

If there is a hole(s) proceed to step 3.

7082905
3.

Using a whip antenna, long screwdriver, or long and thin prybar, apply RTV to the end and then apply the RTV to fill
any holes in the Pressure Relief Valve on the back of the cab.
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Service Update
N252536560 Pressure Relief Valve Leak
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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