GENERAL MOTORS
DCS7355
URGENT - DISTRIBUTE IMMEDIATELY
Date:

October 20, 2025

Subject: REVISION: N242450640-01 - Special Coverage
Turbocharger Replacement
Revised Part and Warranty sections
Models: 2021 Buick Encore GX
2021 Chevrolet Trailblazer
This bulletin is being revised to update the turbocharger part number and update
labor code 9900901 to include warranty information. Please discard all previous
copies of bulletin N242450640.

END OF MESSAGE

Special Coverage
N242450640 Turbocharger Replacement
Release Date:
Revision Description:

Attention:

October 2025

Revision:

01

This bulletin is being revised to update the turbocharger part number and update labor
code 9900901 to include warranty information. Please discard all previous copies of
bulletin N242450640.

This Special Coverage can be seen in the Applicable Warranties section in Investigate Vehicle History
(IVH).

Make

Model

Buick

Encore GX

Chevrolet

Trailblazer

Model Year
From
To

RPO

2021

LIH

2021

Description
ENGINE-GAS (E0-15),3 CYL,
1.2L, DI, L3, DOHC, VVT,
TURBO, ALUM, CSS PRIME

Involved vehicles are identified on the Applicable Warranties section in GM Global Warranty Management system. This
site should always be checked to confirm vehicle involvement prior to beginning any required inspections and/or repairs.
Condition

Special
Coverage

Certain 2021 model year Buick Encore GX and Chevrolet Trailblazer vehicles, equipped with a 1.2L
engine, may have a condition that could cause the turbocharger to fail. If this condition occurs, the
Malfunction Indicator Lamp (Check Engine Light) will illuminate, and a diagnostic trouble code will set.
Additionally, a message may be displayed indicating the vehicle’s available engine power is reduced.
This special coverage covers the condition described above for a period of 15 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
November 6, 2024, 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 November 6, 2024, 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 turbocharger as necessary. The repairs will be made at no charge to the
customer.

Parts
Quantity
1
1
1
1
1
1
1
2
4
1
1
2

Part Name
Turbocharger
Vacuum Tank Kit
Exhaust Pipe Clamp
Catalytic Converter Gasket
Exhaust System Gasket
PCV Vacuum Hose
Gasket, turbocharger
Gasket, turbocharger oil drain
Turbocharger Nut
Turbocharger Oil Seal
Turbocharger Washer
Vacuum Tank Bolts

Part No.
19434771*
25205791
55513359
12641115
13499082
55513554
55494843
55514397
11612078
55487539
55497445
11588723

Important: *In the event that part number 19434771 is not available, please order part number 25204082.
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.

Page 1 of 3

Special Coverage
N242450640 Turbocharger Replacement
Due to the limited initial parts availability, dealers are encouraged not to order these parts for use as shelf
stock.
Warranty Information
Labor Operation
9900900
For vehicles
WITHIN the New
Vehicle, Powertrain
Ltd, CPO
Powertrain Ltd, or
Emission Ltd
Warranty, utilize
the regular
warranty labor op.
For vehicles
OUTSIDE of the
New Vehicle,
Powertrain Ltd,
CPO Powertrain
Ltd, or Emission
Ltd Warranty,
utilize labor op
9900901.
9900902
9900903

Description
Diagnostic Time Only – No Repair Required
Compressor Air Intake Turbocharger Replacement
Add: Install Vacuum Tank Kit
Add: Diagnosis Time

Customer Reimbursement Approved
- For USA and Canada dealers only
- For Export dealers only
Customer Reimbursement Denied – For USA dealers only

Labor
Time
0.1-1.0
3.3
0.3
0.1-1.0

N/A
0.2
N/A

Trans.
Type
ZREG
ZREG

Net
Item
N/A
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.

**

Submit $10.00 administrative allowance in Net/Admin Allowance.

Service Procedure
A vehicle may come in with a customer complaint or DTC that leads to turbocharger replacement. The most frequent
complaints include a cold start rattle noise or P0299 DTC, for which you may refer to 23-NA-058 for more diagnosis info.
•

If the diagnosis DOES lead to turbocharger replacement, refer to Compressor Air Intake Turbocharger
Replacement in SI.

•

If replacing the turbocharger and the vehicle is not already equipped with a Vacuum Tank Kit, install one as well
per SI instructions under Turbocharger Wastegate Actuator Vacuum Tank Replacement.

•

If the diagnosis DOES NOT lead to turbocharger replacement, no further action is covered under the scope of
this field action. Inform the customer that any additional diagnosis or repair needed must be covered by standard
warranty, customer pay, or a goodwill adjustment as applicable.

Customer Notification
General Motors will notify Customers of this special coverage on their vehicle (see copy of typical Customer letter included
with this bulletin).
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 November 30, 2025. 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 2 of 3

Special Coverage
N242450640 Turbocharger Replacement
November 2024
This notice applies to your vehicle, VIN: _____________________________________
Dear General Motors Customer:
As the owner of a 2021 model year Buick Encore GX or Chevrolet Trailblazer, your satisfaction with our product is very
important to us.
This letter is intended to make you aware that some 2021 model year Buick Encore GX or Chevrolet Trailblazer
vehicles, equipped with a 1.2L engine, may have a condition that could cause the turbocharger to fail. If this condition
occurs, the Malfunction Indicator Lamp (Check Engine Light) will illuminate, and a diagnostic trouble code will set.
Additionally, a message may be displayed indicating the vehicle’s available engine power is reduced.
Do not take your vehicle to your GM dealer as a result of this letter unless you believe that your vehicle has the
condition as described above.
What We Have Done: General Motors is providing owners with additional protection for the condition described above.
If this condition occurs on your 2021 model year Buick Encore GX or Chevrolet Trailblazer within 15 years of the date
your vehicle was originally placed in service or 150,000 miles (240,000 km), whichever occurs first, the condition will be
repaired for you at no charge. Diagnosis or repair for conditions other than the condition described above is not
covered under this special coverage program. For customer’s vehicles already outside of the above years and/or miles,
we are still offering reimbursement if the issue occurred within the years and miles stated above. Please follow the
reimbursement steps below.
What You Should Do: If you believe that your vehicle has the condition described above, repairs and adjustments
qualifying under this special coverage must be performed by a General Motors dealer. You may want to contact
your GM dealer to find out how long they will need to have your vehicle so that you may schedule the appointment at a
time that is convenient for you. This will also allow your dealer to order parts if they are not already in stock. Keep this
letter with your other important glove box literature for future reference.
Reimbursement: If you already paid for repairs for the condition described in this letter, and those repairs were
completed prior to this mailing, please complete the enclosed reimbursement form and present it to your dealer with
all required documents. Working with your dealer will expedite your request, however, if this is not convenient, you may
mail the completed reimbursement form and all required documents to Reimbursement Department, PO Box 33170,
Detroit, MI 48232-5170. The completed form and required documents must be presented to your dealer or received by
the Reimbursement Department by November 30, 2025, unless state law specifies a longer reimbursement period.
The right to submit reimbursement claims is provided by GM solely in the interest of customer satisfaction and is
personal to vehicle owners and lessees who previously paid for repairs referenced in this Special Coverage
(“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.
If you have any questions or need any assistance, please contact your dealer or the appropriate Customer Assistance
Center at the number listed below.
For the hearing or speech impaired, please contact our Customer Assistance Center using the Telecommunication
Relay Service by dialing 711 then providing the appropriate Customer Assistance Center number for your vehicle.
Division
Number
Buick
1-800-521-7300
Chevrolet
1-800-222-1020
Puerto Rico – English
1-866-467-9700
Puerto Rico – Español
1-866-467-9700
Virgin Islands
1-866-467-9700
We are sorry for any inconvenience you may experience; however, we have taken this action in the interest of your
continued satisfaction with our products.
Neelie O’Connor
Global Executive Director
Customer Experience Operations
Enclosure
N242450640
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