Customer Satisfaction Program – 44120 Cracked 2-3-4-6-8 Clutch Piston – 2016 Cadillac Chevrolet GMC

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Customer Satisfaction Program
44120 Cracked 2-3-4-6-8 Clutch Piston

Subject:	44120 Cracked 2-3-4-6-8 Clutch Piston
Models:	2016 Cadillac CT6
	2016 Chevrolet Silverado LD
	2016 GMC Sierra LD

Make	Model	Model Year		RPO	Description
		From	To
Cadillac	CT6	2016	2016	M5X	8-Speed Auto Trans (8L90)
Chevrolet	Silverado LD			M5U
GMC	Sierra LD

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	Certain 2016 model year Cadillac CT6, Chevrolet Silverado LD and GMC Sierra LD vehicles, equipped with an 8-speed automatic transmission, may have a condition in which the 2-3-4-6-8 Clutch Piston is out of specification. Parts as installed exhibited a crack condition as cast after machining. As a result the vehicle could exhibit 1-2 upshift slipping or a flaring condition.
Correction	Replace the transmission.

Parts Information

Note: Use the Vehicle Identification Number (VIN), SI and the GM Electronic Parts Catalog to determine which parts to order.

Quantity	Part Name	Part No.
1	Transmission Assembly	24281107
1	Transmission Assembly	24281336
1	Transmission Assembly	24279030
1	Transfer Case Adapter Gasket	24245110 GM Genuine 24245110 Transfer Case Adapter Gasket Package Weight: 1.234 pounds The package length is 20.32 centimeters The package height is 0.508 centimeters The package width is 20.32 centimeters Buy on Amazon Price incl. tax, excl. shipping Last update on 2026-06-10 / Affiliate links / Images from Amazon Product Advertising API
1	Transmission Fluid Cooler Pipe Fitting Seal	23135703 GM 23135703 SEAL-TRANS FLUID CLR PIPE FTG Genuine Oem: Yes, Category 2: Cooling, Item Name: Pipe Assembly Gasket, Category 1: Cooling System Brand: GM, Fitment Type: Direct Replacement, Part Ref# On Diagram: ONLY PART REFERENCE #3 ON THE DIAGRAM IS Manufacturer Part Number: 23135703, Category 3: Transmission Oil Cooler, Quantity Needed: 1 $15.50 Buy on Amazon Price incl. tax, excl. shipping Last update on 2026-06-09 / Affiliate links / Images from Amazon Product Advertising API
1	Exhaust System Seal – RH	15077362 Genuine GM 15077362 Exhaust System Seal General Motors OEM product Package Dimensions: 0.762 H x 9.652 L x 9.144 W (centimetres) Package Weight: 0.02 pounds Country of Origin : China $20.99 Buy on Amazon Price incl. tax, excl. shipping Last update on 2026-06-10 / Affiliate links / Images from Amazon Product Advertising API
1	Exhaust System Seal – LH	15035747 29 Reviews Genuine GM 15035747 Exhaust Manifold Pipe Seal Product Type: Auto Part Package Quantity: 1 Made In China Package Dimensions: 12.7Cm (L) X 8.382Cm (W) X 3.048Cm (H) $19.99 Buy on Amazon Price incl. tax, excl. shipping Last update on 2026-06-10 / Affiliate links / Images from Amazon Product Advertising API
1	Exhaust Pipe Clamp	20779889 GM Genuine Parts 20779889 Exhaust Pipe Clamp Helps provide a tight seal for your vehicle's exhaust connections Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE) GM Genuine Parts are designed, engineered and tested to rigorous standards, and are backed by General Motors GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle GM regularly updates production and service part designs to integrate new materials and technologies $24.58 Buy on Amazon Price incl. tax, excl. shipping Last update on 2026-06-17 / Affiliate links / Images from Amazon Product Advertising API
4	Front Axle Prop Shaft Bolt	11548472 No products found.
2	Transmission Mount Bolts	11547366
2	Rear Prop Shaft Retainer	23107857 Genuine GM Retainer Part# 23107857 Genuine General Motors part that fits your specific vehicle Retainer Part Number: 23107857 Manufactured to meet specifications for fit, form, and function Buy on Amazon Price incl. tax, excl. shipping Last update on 2026-06-09 / Affiliate links / Images from Amazon Product Advertising API
6	Transmission Torque Converter Bolt	24503068 GM 24503068 BOLT/SCREW-DRV BELT TENSR BRKT Genuine General Motors part that fits your specific vehicle Tensioner Bracket Bolt Screw Part Number: 24503068 Manufactured to meet specifications for fit, form, and function $14.76 Buy on Amazon Price incl. tax, excl. shipping Last update on 2026-06-10 / Affiliate links / Images from Amazon Product Advertising API
1	Front Axle Prop Shaft Slip Yoke Boot Clamp	26064275 GM Genuine 26064275 Propeller Shaft Plunge Boot Shroud Clamp, Rear genuine oem factory part exact fit durable best in quality this is not an aftermarket part $19.49 Buy on Amazon Price incl. tax, excl. shipping Last update on 2026-06-09 / Affiliate links / Images from Amazon Product Advertising API
1	Catalytic Converter Gasket (At Converter)	22759470 General Motors 22759470, Catalytic Converter Gasket Genuine General Motors OEM product $27.43 Buy on Amazon Price incl. tax, excl. shipping Last update on 2026-06-10 / Affiliate links / Images from Amazon Product Advertising API
6	Rear Prop Shaft Bolt	11611279
8	Front Axle Prop Shaft Bolt	11547241
2	Air Conditioning Evaporator Seal	13579649 O-Ring" title="Customer Satisfaction Program - 44120 Cracked 2-3-4-6-8 Clutch Piston - 2016 Cadillac Chevrolet GMC 22"> GM Genuine Parts 13579649 Air Conditioning Line O-Ring Product Type: O Rings Package Dimensions: 3.048 H x 0.508 L x 3.048 W (centimeters) Package Weight: 0.004 kilograms Country of Origin : Mexico $14.25 Buy on Amazon Price incl. tax, excl. shipping Last update on 2026-06-10 / Affiliate links / Images from Amazon Product Advertising API
2	Air Conditioning Evaporator TXV Seal	13579646 GM Seal Front section, 3/4 id. Rear section, 3/4 id. Type 1. Type 2. 2013-2017. 2.4L, rear. 2.0L, large. Condenser & lines. 2.0L turbo, with hybrid. Without hybrid, rear, upper. 3.6L & 3.0L twin-turbo, lower. $19.84 Buy on Amazon Price incl. tax, excl. shipping Last update on 2026-06-10 / Affiliate links / Images from Amazon Product Advertising API
2	Transmission Fluid Auxiliary Cooler Retainer	23385887
2	Front Suspension Strut Bolt	11561309
2	Front Lower Control Arm Front Bolt	11547107
2	Front Lower Control Arm Rear Bolt	11547108
2	Front Wheel Drive Shaft Nut	11612295
1	Front Wheel Drive Intermediate Shaft Retaining Ring	23269759
8	Drivetrain and Front Suspension Cradle Bolt	11548391
6	Automatic Transmission Flex Plate Bolt	11588468 11588468 BOLT 4.115 Genuine General Motors part that fits your specific vehicle Flywheel Bolt Part Number: 11588468 Manufactured to meet specifications for fit, form, and function $210.63 Buy on Amazon Price incl. tax, excl. shipping Last update on 2026-06-09 / Affiliate links / Images from Amazon Product Advertising API

Warranty Information

Service Procedure

Replace the transmission. Refer to Transmission Replacement, Transmission Replacement (LGW Engine), Transmission Replacement (LTG Engine), or Transmission Replacement (LGX Engine) in SI.

Dealer Responsibility

All new, used, GM Certified Used, courtesy transportation vehicles, dealer shuttle vehicles, etc. in dealers’ possession and subject to this program 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.

Dealers are to service all vehicles subject to this program at no charge to customers, regardless of mileage, age of vehicle, or ownership, through July 31, 2018. Customers who have recently purchased vehicles sold from your vehicle inventory, and for which there is no customer information indicated on the involved vehicle listing, are to be contacted by the dealer. Arrangements are to be made to make the required correction according to the instructions contained in this bulletin. A copy of the customer letter is provided in this bulletin for your use in contacting customers. Program follow-up cards should not be used for this purpose, since the customer may not as yet have received the notification letter.

In summary, whenever a vehicle subject to this program enters your vehicle inventory, or is in your facility for service through July 31, 2018, you must take the steps necessary to be sure the program correction has been made before selling or releasing the vehicle.

Dealer Reports

For dealers with involved vehicles, a listing with involved vehicles has been prepared and will be provided to U.S. and Canadian dealers through the GM GlobalConnect Recall Reports, or sent directly to export dealers. The listing may contain customer names and addresses obtained from Motor Vehicle Registration Records. The use of such motor vehicle registration data for any purpose other than follow-up necessary to complete this program is a violation of law in several states/provinces/countries. Accordingly, you are urged to limit the use of this report to the follow-up necessary to complete this program.

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, Section 6.1.10 – Courtesy Transportation, for details.

Customer Notification

USA & Canada – General Motors will notify customers of this recall on their vehicle (see copy of customer letter included with this bulletin).

Export – Letters will be sent to known owners of record located within areas covered by the US National Traffic and Motor Vehicle Safety Act. For owners outside these areas, dealers should notify customers using the attached sample letter.

August 2016

Dear General Motors Customer:

We have learned that your 2016 model year Cadillac CT6, Chevrolet Silverado LD or GMC Sierra LD equipped with an 8-speed automatic transmission, may have a condition in which the 2-3-4-6-8 Clutch Piston is out of specification. Parts as installed exhibited a crack condition as cast after machining. As a result the vehicle could exhibit 1-2 upshift slipping or a flaring condition.

Your satisfaction with your [vehicle name] is very important to us, so we are announcing a program to prevent this condition or, if it has occurred, to fix it.

What We Will Do: Your GM dealer will replace the transmission. This service will be performed for you at no charge until August 31, 2018. After that, any applicable warranty will apply.

What You Should Do: To limit any possible inconvenience, we recommend that you contact your dealer as soon as possible to schedule an appointment for this repair. By scheduling an appointment, your dealer can ensure that the necessary parts will be available on your scheduled appointment date.

If you have any questions or need any assistance, just contact your dealer or the appropriate Customer Assistance Center at the number listed below.

We sincerely regret any inconvenience or concern that this situation may cause you. We want you to know that we will do our best, throughout your ownership experience, to ensure that your GM vehicle [or if only one model involved, list name] provides you many miles of enjoyable driving.

Terry M. Inch

Executive Director

Global Connected Customer Experience

Enclosure

44120

GLOBAL SAFETY FIELD INVESTIGATIONS
DCS4126
URGENT – DISTRIBUTE IMMEDIATELY
Date: July 29, 2016
Subject: 44120 – Customer Satisfaction Program
Cracked 2-3-4-6-8 Clutch Piston
Models: 2016 Cadillac CT6 Equipped w/ 8-Spd Automatic (RPO M5X)
2016 Chevrolet Silverado LD Equipped w/ 8-Spd Automatic (RPO M5U)
2016 GMC Sierra LD Equipped w/ 8-Spd Automatic (RPO M5U)
To: All Cadillac, Chevrolet and GMC Dealers
General Motors is releasing Customer Satisfaction Program 44120 today. The total number of U.S. vehicles involved is approximately 884. Please see the attached bulletin for details.
Customer Letter Mailing
The customer letter mailing will begin on August 11, 2016.
Global Warranty Management (GWM)
The Investigate Vehicle History (IVH) screen in the GWM system will be updated July 29, 2016. A list of involved vehicles in dealer new inventory is attached to this message. Please hold all warranty transactions until the VIN appears in IVH.
END OF MESSAGE
GLOBAL SAFETY FIELD INVESTIGATIONS

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