GENERAL MOTORS
DCS7460
URGENT - DISTRIBUTE IMMEDIATELY
Date:

April 1, 2026

Subject: N252529080 - Service Update
RESS High Voltage Header Plug Missing
Models: 2024 – 2025 Chevrolet Brightdrop 400
2023 – 2025 Chevrolet Brightdrop 600
2024 – 2026 Chevrolet Silverado EV
2025 – 2026 Cadillac ESCALADE IQ
2026 Cadillac ESCALADE IQL
2024 – 2026 GMC Hummer EV
2024 – 2026 GMC Sierra EV
General Motors is releasing Service Update N252529080 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
N252529080 RESS High Voltage Header Plug Missing
Release Date:
Attention:

April 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 April 30, 2028.
For EV Involved Vehicles: The repairs outlined in this bulletin must only be completed at an authorized
EV dealer and repairs must be performed by a technician who has successfully completed the
applicable technical training required to perform this repair.
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
Cadillac
Cadillac
Chevrolet
Chevrolet
Chevrolet
GMC
GMC
GMC

Model

From
2025
2026
2024
2023
2024
2024
2024
2024

ESCALADE IQ
ESCALADE IQL
Brightdrop 400
Brightdrop 600
Silverado EV
HUMMER EV Pickup
HUMMER EV SUV
Sierra EV

To
2026
2026
2025
2025
2026
2026
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 be missing a high voltage header plug on the RESS battery pack drive
motor connector.
Dealers are to inspect the RESS pack connectors and install the proper HV Header Plug if missing.

Parts
Quantity
As
Required
As
Required

X3 Connector Header Plug

Part Name

Part No.
13544801

X1 Connector Service Kit

WPC896*

Reminder: Parts may be removed from SPRINT and Retail Inventory Management (RIM) and be non-returnable. Dealers
should review the affected parts to confirm RIM managed status. Parts may have quantity limiters in effect. Due to the
limited initial parts availability, dealers are encouraged not to order these parts for use as shelf stock.
Information below applies ONLY to PN WPC896 (X1 Connector Service Kit)
US & Canada Dealers
*Kit PN WPC896 required to complete this field action is NOT to be obtained from General Motors Customer Care and
Aftersales (GMCC&A). PN WPC896 can be obtained from the Warranty Parts Center (WPC) using the TSP Dealer
Request Form located on Global Connect<Department - Service Department<Service Forms Application<General
Information tab<WPC - Temporary Service Part (TSP) Request Form. Instructions for submitting are on the form. The
part number is in the table above.
Please make sure to include the VIN as the WPC will be doing a VIN verification. It is estimated that there are only 50
involved vehicles that will require parts being replaced (2% of the total population). If your VIN isn’t on this Field Action
then your order will be cancelled.

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Service Update
N252529080 RESS High Voltage Header Plug Missing
Warranty Information
Labor
Operation
9108287
9108288

Description
Inspect Only – No Problem Found – Includes HV disable, data
collection, and inspection
Inspected – Found Issue - Includes HV disable, data collection,
inspection, and call to TAC

Labor
Time
1.7

Trans.
Type
ZFAT

Net
Item
N/A

1.8

ZFAT

N/A

Please Note: The above labor time(s) are published direct from the Labor Time Guide.
Service Procedure
1.

Perform SPS2 Hybrid/EV Battery Data Retrieval by following the directions in 25-NA-044.

2.

Disable the high voltage system. Refer to High Voltage Disabling in SI.

3.

Lift the vehicle. Refer to Lifting and Jacking the Vehicle in SI.

4.

Remove the High Voltage Battery Tray Lower Rear Reinforcement if applicable. Refer to High Voltage Battery Tray
Lower Rear Reinforcement Replacement in SI.

7080859

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Service Update
N252529080 RESS High Voltage Header Plug Missing

7103870
5.

Inspect the rear of the RESS for the presence of a plug/dust cover/dummy connector in the X3 location as shown
above.
a.

If the RESS has an orange plug with a black lever lock installed, no further action is required.

b.

If the RESS does not have a plug installed, or has only a black dust cover with no lever lock, take photos
of the connector.

7103869
6.

Remove the X1 cable from the X1 connector and inspect for the presence of the black insulator as shown above.
a.

If the black insulator is NOT present, no further action is required.

b.

If the black insulator IS present, take photos of the connector.

Page 3 of 5

Service Update
N252529080 RESS High Voltage Header Plug Missing

7103868
7.

8.

Inspect the X1 cable to see if it has a black insulator in it.
a.

If the black insulator IS present, no further action is required.

b.

If the black insulator IS NOT present, take photos of the cable end.

If directed to take a photo of the connector in either step 4 or 5, or the cable in step 7, contact TAC:
-

U.S. Dealers: Please contact GM Technical assistance (TAC) by initiating TAC CXC (CX Connect) Case in
Global Connect, click on “New TAC Case” found on the Technical Assistance tab.
Canada Dealers: Call 1-800-263-7740 for English or 1-800-263-7960 for French.
If NOT directed to take photos during those steps, or if TAC does not request further action, reinsert the X1 cable
to the X1 connector and place a cap on the X3 connector at this point.

9.

Reinstall the High Voltage Battery Tray Lower Rear Reinforcement. Refer to High Voltage Battery Tray Lower Rear
Reinforcement Replacement in SI.

10. Lower the vehicle. Refer to Lifting and Jacking the Vehicle in SI.
11. Enable the high voltage system. Refer to High Voltage Disabling 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.

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Service Update
N252529080 RESS High Voltage Header Plug Missing
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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