NHTSA ID Number: 11027714
Manufacturer Communication Number: N252494003-02
TSB/Document Date: 2026-01-21
Summary
Certain vehicles listed above, may have a condition where the connecting rod and/or crankshaft engine components in these vehicles may have manufacturing defects that can lead to engine damage and engine failure. This special coverage covers if an engine failure occurs in the vehicle as a result of the condition described above for a period of 10 years or 150,000 miles (240,000 km), whichever occurs first, from the date the vehicle was originally placed in service, regardless of ownership. For vehicles covered by Vehicle Service Contracts, all eligible claims with repair orders on or after May 23, 2025, are covered by this special coverage and must be submitted using the labor operation codes provided with this bulletin. Claims with repair orders prior to May 23, 2025, must be submitted to the Service Contract provider. Vehicle owners or lessees who paid for repairs referenced in this Special Coverage (“Customers”) are eligible for reimbursement of their reasonable and customary expenses in accordance with the procedures specified below. The conditional right to reimbursement is provided by GM solely in the interest of customer satisfaction and is personal to Customers. Customers may not assign and GM does not consent to any assignment of any Customer’s right to submit reimbursement claims, or to receive reimbursement, or any other rights granted by this Special Coverage to any third party, including but not limited to service contract providers, and this Special Coverage is not intended to and does not confer any third party beneficiary, subrogation or contribution rights, or any other rights to reimbursement, against GM, whether in law, equity or otherwise, on any third parties. Dealers are to replace the engine. The repairs will be made at no charge to the customer.
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TSB/Document ID: N252494003-02
Replacement Service Bulletin Number:
MFR Communication Date: 2026-01-21
MFR Internal Campaign ID/Software Version:
Communication Type: Service Campaign
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem:
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GENERAL MOTORS
DCS7413
URGENT - DISTRIBUTE IMMEDIATELY
Date:
January 20, 2026
Subject: REVISION: N252494000-10 – Safety Recall and N252494003-02 –
Special Coverage
L87 Engine Loss of Propulsion
Revised Parts Table
Models: 2021-2024 Cadillac Escalade
2021-2024 Cadillac Escalade ESV
2021-2024 Chevrolet Silverado 1500
2021-2024 Chevrolet Suburban
2021-2024 Chevrolet Tahoe
2021-2024 GMC Sierra 1500
2021-2024 GMC Yukon
2021-2024 GMC Yukon XL
These bulletins are being revised to update the required oil in the parts table for
U.S dealers only. Please discard all previous copies of bulletin N252494000 and
N252494003 (*Updated Information).
The following Mobil 1 FS 0W-40 information applies to U.S. dealers only.
Other markets, including Canada, Mexico, and Export markets, will be
communicated once available.
*Updated Information - GM will now authorize Mobil 1 FS 0W-40 for L87 field action
oil changes (N252494000 and N252494003). Mobil 1 Supercar 0W-40 remains the
priority product to use for L87 field action oil changes to sell down existing
inventory, with FS 0W-40 available as a secondary option.
All Mobil 1 Supercar 0W-40 inventory purchased for the L87 field actions must be
depleted before fully transitioning to Mobil 1 FS 0W-40. L87 field action claims for
oil changes using either product will be accepted and reimbursed in full through
March 31, 2026. Beginning April 1, 2026, GM will only reimburse L87 field action
oil changes performed with Mobil 1 FS 0W-40.
As a reminder, 0W-40 FS is available at a competitive price and should be used
for all customer paid maintenance visits.
Also note: Technical Service Bulletin 25-NA-339: Engine Oil Change Mobil 1
Supercar 0W40 DexosR Customer Pay Maintenance is being canceled, please
submit all claims before 2/20/26.
END OF MESSAGE
Special Coverage
N252494003 L87 Engine Loss of Propulsion
Release Date:
Revision Description:
Attention:
January 2026
Revision:
02
This bulletin is being revised to update the required oil in the parts table. Please discard
all previous copies of bulletin N252494003. (*Updated Information).
The following Mobil 1 FS 0W-40 information applies to U.S. dealers only. Other markets, including
Canada, Mexico, and Export markets, will be communicated once available.
*Updated Information - GM will now authorize Mobil 1 FS 0W-40 for L87 field action oil changes
(N252494000 and N252494003). Mobil 1 Supercar 0W-40 remains the priority product to use for L87
field action oil changes to sell down existing inventory, with FS 0W-40 available as a secondary option.
All Mobil 1 Supercar 0W-40 inventory purchased for the L87 field actions must be depleted before fully
transitioning to Mobil 1 FS 0W-40. L87 field action claims for oil changes using either product will be
accepted and reimbursed in full through March 31, 2026. Beginning April 1, 2026, GM will only reimburse
L87 field action oil changes performed with Mobil 1 FS 0W-40.
As a reminder, 0W-40 FS is available at a competitive price and should be used for all customer paid
maintenance visits.
Model Year
Make
Cadillac
Cadillac
Chevrolet
Chevrolet
Chevrolet
GMC
GMC
GMC
Model
Escalade
Escalade ESV
Silverado 1500
Suburban
Tahoe
Sierra 1500
Yukon
Yukon XL
From
2021
2021
2021
2021
2021
2021
2021
2021
To
2024
2024
2024
2024
2024
2024
2024
2024
Attention: Involved vehicles are identified on the Applicable Warranties section in Investigate Vehicle History (IVH). This
site should always be checked to confirm vehicle involvement prior to beginning any required inspections and/or repairs.
Condition
Special
Coverage
Certain vehicles listed above, may have a condition where the connecting rod and/or crankshaft engine
components in these vehicles may have manufacturing defects that can lead to engine damage and
engine failure.
This special coverage covers if an engine failure occurs in the vehicle as a result of the condition
described above for a period of 10 years or 150,000 miles (240,000 km), whichever occurs first, from the
date the vehicle was originally placed in service, regardless of ownership.
For vehicles covered by Vehicle Service Contracts, all eligible claims with repair orders on or after May
23, 2025, are covered by this special coverage and must be submitted using the labor operation codes
provided with this bulletin. Claims with repair orders prior to May 23, 2025, must be submitted to the
Service Contract provider.
Correction
Vehicle owners or lessees who paid for repairs referenced in this Special Coverage (“Customers”) are
eligible for reimbursement of their reasonable and customary expenses in accordance with the
procedures specified below. The conditional right to reimbursement is provided by GM solely in the
interest of customer satisfaction and is personal to Customers. Customers may not assign and GM
does not consent to any assignment of any Customer’s right to submit reimbursement claims, or to
receive reimbursement, or any other rights granted by this Special Coverage to any third party,
including but not limited to service contract providers, and this Special Coverage is not intended to and
does not confer any third party beneficiary, subrogation or contribution rights, or any other rights to
reimbursement, against GM, whether in law, equity or otherwise, on any third parties.
Dealers are to replace the engine. The repairs will be made at no charge to the customer.
Page 1 of 4
Special Coverage
N252494003 L87 Engine Loss of Propulsion
Parts
Quantity
1
1
1
1
1
1
6
1
2
1
1
8
2
2
8
10
2
1
1
2
2
1
1
8
Part Name
ENGINE*
ENGINE*
BELT, ACSRY DRV PRIM
BELT, ACSRY DRV AUX
SEAL, A/C CMPR & CNDSR HOSE
SEAL, A/C CMPR & CNDSR HOSE
BOLT,ENG MT FRM SI
GASKET, ENG OIL CLR
RETAINER,TRANS FLUID CLR PIPE CONN
SEAL,EXH SYS
SEAL,EXH SYS
GASKET,INT MANIF
GASKET,W/PMP
SEAL,TRANS FLUID CLR PIPE FTG
BOLT,ENG MT ENG SI
BOLT,EXH MANIF
GASKET,EXH MANIF
PIPE,FUEL FEED INTER
PIPE,FUEL FEED INTER
SEAL KIT,F/INJR O-RING*
SEAL KIT,F/INJR O-RING*
GASKET,F/PMP BRKT
SEAL,OIL LVL IND
OIL, ENG MOBIL 1 FS 0W40
8
OIL, ENG 0W40+ Dexos R++
8
OIL,ENG 0W20 Dexos
4
COOLANT,ENG (1 GALLON) Dexcool
1
1
1
1
1
HOSE ENGINE OIL COOLER
RADIATOR*
RADIATOR*
RADIATOR*
RADIATOR*
Part No.
12740076
19420611
12669858
12658178
13579648
13579649
11549180
23129010
22988272
15035747
15077362
12626354
12682391
85639955
11548998
11546600
12657093
12679463
12703668
12726902
19432442
12679867
24504031
88862479
(US)
19432866
(US)
19432331(US)
19432456(CA)
12346290(US)
10953464(CA)
85724972
85575817
85575818
85575815
85575814
*Note: Use the VIN and the GM Electronic Parts Catalog (EPC) to determine which part to order if two or more part
numbers are listed for the same part, as it may vary by vehicle options.
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. There are a
small number of vehicles anticipated that will need this fix. Due to the limited initial parts availability, dealers are
encouraged not to order these parts for use as shelf stock.
Note: Choose the applicable one of the oil parts numbers above, Oil/Fluid will be supplied by your Oil Distributor.
Warranty Information
Labor
Operation
For vehicles
WITHIN the
New
Vehicle,
Powertrain
Limited
Warranty or
Description
Engine Replacement
Escalade/Tahoe/Suburban/Yukon/Yukon XL
2WD w/ F47
2WD w/o F47
4WD w/ F47
4WD w/o F47
Silverado/Sierra
Labor
Time
Trans.
Type
ZREG
18.3
18.2
18.4
18.3
Page 2 of 4
Net
Item
N/A
Special Coverage
N252494003 L87 Engine Loss of Propulsion
CPO
Powertrain
Warranty,
utilize the
regular
warranty
labor op.
2WD
4WD
18.5
18.6
ADD TIMES (applies to all vehicles/option combinations):
Recover/Recharge R1234YF AC system
Recover/Recharge R134A AC system
Inspection and Diagnosis
1.2
0.3
1.0
For vehicles
OUTSIDE
of the New
Vehicle,
Powertrain
Limited
Warranty or
CPO
Powertrain
Warranty,
utilize labor
op 9900927
9900928
Diagnosis Only – No Further Action Required
9900929
Customer Reimbursement Approved
- For USA and Canada dealers only
- For Export dealers only
Customer Reimbursement Denied – For USA dealers only
9900930
**
Up To
1.0
N/A
0.2
N/A
ZREG
N/A
ZREG
**
ZREG
***
For USA and Canada: Submit the dollar amount reimbursed to the Customer in Net/Reimbursement. Submit $20.00
USD ($25.00 CAD) administrative allowance in Net/Admin Allowance.
For Export: Submit the dollar amount reimbursed to the Customer in Net/Reimbursement.
*** Submit $10.00 administrative allowance in Net/Admin Allowance.
Please Note: The above labor time(s) are published direct from the Labor Time Guide.
Service Procedure
1.
Verify any of the field actions (N252494000, N252494001, N252494002) have been completed and closed in IVH
prior to moving forward with this bulletin.
2.
A vehicle may come in with a seized engine, P0016 code, or a knocking noise.
3.
If a vehicle is exhibiting any of these conditions, check it for basic maintenance/neglect.
•
If the vehicle is not showing any obvious signs of neglect and has a seized engine or a P0016 code,
replace the engine. Refer to Engine Replacement in SI.
•
If the vehicle IS showing signs of neglect such as low/no oil level, has been hydrolocked, etc, the vehicle
is NOT covered under this special coverage.
•
If the vehicle has a knocking noise, run the L87 PicoScope Test per field action #N252494000.
Determine whether to replace the engine based on the results of that test.
•
If the vehicle has a valvetrain or other top end issue, it is NOT COVERED under this special coverage.
Courtesy Transportation – For USA & Canada
Courtesy transportation is available for Customers whose vehicles are involved in a product program and still within the
warranty coverage period. See General Motors Service Policies and Procedures Manual for courtesy transportation
program details.
Customer Notification
General Motors will notify Customers of this special coverage on their vehicle.
Page 3 of 4
Special Coverage
N252494003 L87 Engine Loss of Propulsion
Customer Reimbursement
Customer requests for reimbursement of previously paid repairs to correct the condition described in this bulletin are to
be submitted to the dealer prior to or by May 31, 2026. See General Motors Service Policies and Procedures Manual
(USA & Canada) or local Policies and Procedures, for details.
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
Page 4 of 4
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