GLOBAL SAFETY FIELD INVESTIGATIONS
DCS5709
URGENT - DISTRIBUTE IMMEDIATELY
Date:

March 9, 2021

Subject: REVISION – N202321841-02 – Service Update
Transmission Clutch Spring Retaining Ring
Revised Warranty section
Models: 2021 Chevrolet Trailblazer
Equipped with Automatic Transmission (RPO M3F)
To:

All General Motors Dealers

This bulletin has been revised to update the labor time. Please discard all
copies of N202321841-01.

END OF MESSAGE
GLOBAL SAFETY FIELD INVESTIGATIONS

Service Update
N202321841 Transmission Clutch Spring Retaining Ring
Release Date:
Revision Description:
Attention:

March 2021

Revision:

02

This bulletin has been revised to update the labor time. Please discard all copies of
N202321841-01.

On January 12, 2021 an inspection procedure was made available and vehicles that passed the
inspection could be delivered and closed using the “Inspect Only – Vehicle Passed Inspection (No Further
Action Required)” labor code 9105547. For vehicles which did not pass inspection and were held, parts
are now available to complete this repair and floor plan reimbursement has been added to this bulletin.
All involved vehicles that are in New and Unsold dealer inventory must be held and not delivered to
customers, dealer traded, or used for demonstration purposes until the inspection contained in this
bulletin has been performed on the vehicle.
This service update involves vehicles in dealer inventory only and will expire February 28, 2022.

Make
Chevrolet

Model
Trailblazer

Model Year
From
To
2021
2021

RPO
M3F

Description
Automatic Transmission, 9T4X

This inspection and service procedure should be performed on vehicles in dealer inventory only. Involved vehicles are
marked “open” on the Investigate Vehicle History screen 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

Correction

On certain vehicles equipped with automatic transmissions, the clutch spring retaining ring may not be
fully seated. Vehicles with this condition may set DTC Code P0747 and the MIL light (malfunction
indicator light) will illuminate. This typically occurs at low mileage.
Dealers will inspect the transmission by following the procedure and if it fails, the transmission will be
replaced.

Parts
Trailblazer M3F
Quantity
1
6
3
1
1
2
1
1
2
2
2
3
3
4
3
2
1
2
3
4
1

Part Name
TRANSMISSION
TRANSMISSION FLUID
SEAL, TRANS FLUID CLR HOSE FTG (O RING) (AT DIFF CLR)
GASKET
GASKET, EXH SYS FRT
NUT, (M12X1.75X95)
SEAL, PWR TRFER U CVR TO INTER DRV SHF
RETAINER, PWR TRFER U PROP
NUT, RR WHL DRV SHF (M24X1.5,50 OD,22THK)
WASHER, RR WHL DRV SHF
RING
BOLT, TRANS (M10X1.5X15 9.8 PL)
BOLT, ENG MT ENG SI (M12 X 1.75 X 61) (04.085) (ACDelco #11547918)
BOLT, DRV MOT MT (RHS) (SINGLE USE) (M10X1.5X50) (04.085)
BOLT, ENG MT ENG SI (M12 X 1.75 X 61) (04.085) (ACDelco #11547918)
BOLT, ENG MT ENG SI (SINGLE USE) (12X1.75X55)
SEAL
BOLT, DRIVETRAIN & FRT SUSP CRADLE RR
BOLT, TRANS MT STRUT BRKT (SINGLE USE) (M12X1.75X56)
NUT, (M12X1.75X95)
BOLT, ENG MT BRKT (SINGLE USE) (M12X1.75X85.9)

Part No.
24283290
88865601 US
19420142 CN
25874797
42598654
13499082
11603179
23206807
23206808
11611687
11547142
42721955
11588468
11547918
11546406
11547918
11589276
84501585
11549247
11610906
11603179
11589279

Parts should only be ordered when inspection determines that it is necessary to replace parts.
It is estimated that only 12% involved vehicles will require parts replaced. Due to the small number of vehicles
anticipated that will need this fix and the limited initial parts availability, dealers are encouraged not to order
these parts for use as shelf stock.
Reminder: Parts may be removed from Retail Inventory Management (RIM). Dealers should review the affected parts
to confirm RIM managed status. Parts may have quantity limiters in effect.
Copyright 2021 General Motors. All Rights Reserved.

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Service Update
N202321841 Transmission Clutch Spring Retaining Ring
Warranty Information
Labor
Operation
9105547
9105613
9105614

Description
Inspect Only – Vehicle Passed Inspection (No Further Action
Required)
Replace Transmission (includes inspection)
Floor Plan Reimbursement – NEW INVENTORY ONLY

Labor
Time
0.5

Trans.
Type
ZFAT

Net
Item
N/A

11.9
N/A

N/A
ZFAT

N/A
*

Note: To avoid having to “H” route the floor plan transaction for wholesale approval, it must be submitted prior to the
repair transaction.
Floor Plan Reimbursement – NEW INVENTORY ONLY
*

USA & Canada Only – For vehicles eligible for floor plan reimbursement, the amount should be submitted in Net
Item/Miscellaneous. This amount should represent the product of the vehicle’s average daily interest rate (see table
below) multiplied by the actual number of days the vehicle was in dealer inventory and not available for sale due to
not passing inspection. This reimbursement is limited to the number of days from the date the inspection procedure
was sent (January 12, 2021) to the date the repair is completed, and the vehicle is ready for sale (not to exceed 57
days):
Floor Plan Reimbursement Amount
Vehicle
USA
Canada
2021 Chevrolet Trailblazer
$3.12
$4.11

Service Procedure
Important: This test should be performed with the engine idling and no use of the accelerator pedal (or engine revving).
1.
Start vehicle and warm up for 1 minute.
2.
Apply the parking brake before starting the test.
3.
While applying the brakes AT ALL TIMES, shift the transmission from P (park) to R (reverse), N (neutral) and to D
(drive) waiting 3 seconds between shifts.
4.
Reverse the steps from D (drive), N (neutral), R (reverse) and to P (park) waiting 3 seconds between shifts while
continuing applying the brakes.
5.
Repeat this process 30 times and look for a “shift bump” going into or coming out of D (drive).
6.
If no shift bumps are felt, no further action is required. Verify the vehicle engages in park and does NOT move or roll
with the park brake disengaged.
7.
If shift bumps are felt, replace the transmission. Refer to Transmission Replacement in SI.
Dealer Responsibility
Dealers must take the steps necessary to ensure that the service update inspection and service procedure has been
made to all involved vehicles in dealer inventory before selling or dealer-trading the vehicle, but no later than February
28, 2022.
All new, used, GM Certified Used, courtesy transportation vehicles, dealer shuttle vehicles, etc. in dealers' possession
and subject to this bulletin 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 Used vehicles currently in the dealers’ inventory within the Certified Pre-Owned Inventory System
(CPOIS) 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 CPOIS system, or once again be used in the CTP program.
Dealer Reports
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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