Customer Satisfaction Program
48040 - Wire Harness To TCM Controller Wear-Thru Causing DTCs
To Set
Reference Number:
Attention:

Make
Cadillac

Release Date:
Revision:

N16204804

November 2016
00

This program is in effect until December 31, 2018.

Model
CT6

Model Year
From
To
2016
2016

RPO

Description

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

Certain 2016 model year Cadillac CT6 vehicles, may have a condition in which a heater hose clamp at
the right rear of the engine compartment may come into contact with the engine electrical harness. This
contact may eventually wear the harness causing the engine to run rough and have the potential for an
unwanted transmission downshift, or loss of power steering assist.
Inspect the vehicle for engine harness clearance. Install a revised engine harness retainer, reorient the
heater hose clamp if required and repair or replace any affected wiring.

Parts
Quantity
1
1
1
2
2
1
2
1
1
1
2
2
2
8
2

Part Name
Automatic Transmission Retainer
Catalytic Converter Gasket
Exhaust Pipe Clamp
Exhaust System Front Gasket
Turbo Exhaust Pipe Gasket
Heater Inlet Hose
Heater Inlet Hose Clamp
Engine Harness Clip
Air Conditioning Compressor and Condenser Hose Seal
Air Conditioning Compressor and Condenser Hose Seal
Front Suspension Strut Bolt
Front Wheel Drive Shaft Nut
Front Lower Control Arm Front Bolt
Drivetrain and Front Suspension Cradle Bolt
Engine Coolant

2
As
Required
As
Required
As
Required
As
Required
(submit as
Net Item)

Transmission Fluid Auxiliary Cooler Retainer
Wire Splice (Salmon)

Part No.
15304748
22759470
23436598
22997477
12638677
23507149**
11547607**
19130464**
13579648**
13579646**
11561309**
11612295**
11547107**
11548391**
12346290
(US)**
10953464
(CN)**
23385887**
19300089**

Wire Splice (Blue)

19300090**

Wire Splice (Yellow)

19300091**

Woven Polyester Electrical Tape (PET) – Part Number 1089482 (preferred) or
Equivalent Anti-Abrasion Tape or Electrical Tape

Obtain from
Kent
Automotive*

Note: Use the VIN and the GM Electronic Parts Catalog (EPC) to determine which parts to order.
* To obtain the PET, contact Kent Automotive at 1-888-937-5368 (USA), 1-800-563-1717 (Canada), or www.kentautomotive.com and request the special order part number 1089482. Dealers that do not have a Kent Automotive
account or representative must advise the Customer Service Representative that the part(s) is being used for this GM
bulletin to obtain special bulletin pricing. Do not order from GMCCA.
** Part only needs to be replaced if the engine is removed from the vehicle.

Copyright 2016 General Motors. All Rights Reserved.

Page 1 of 14

Customer Satisfaction Program
48040 - Wire Harness To TCM Controller Wear-Thru Causing DTCs
To Set
Warranty Information
Labor
Operation
9102739

Description
Inspect Engine Harness and Install Automatic Transmission
Retainer
LGW
LGX
Add: Wire Harness Repair
LGX
LGW

Labor
Time

Trans.
Type
ZFAT

Net
Item
*

1.5
2.0
13.1
14.0

* The amount identified in “Net Item” should represent the actual sum total of the current GMCC&A Dealer net price for
woven polyester electrical tape (PET) needed to perform the required repairs, not to exceed $0.31 USD, $0.43 CAD, plus
applicable Mark-Up or Landed Cost (for Export).
Service Procedure
3.0L Engine Harness Inspection Procedure
1.

Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI.

Warning: In order to avoid being burned, do not service the exhaust system while it is still hot. Service the system when
it is cool.
Warning: Avoid contact with HOT components. Wear safety glasses and protective gloves to avoid personal injury.
2.

Remove the right side warm up three-way catalytic converter. Refer to Warm Up Three-Way Catalytic Converter
Replacement (Right, LGW) in SI.

4626696
3.

Verify the engine harness (1) is NOT contacting the heater inlet hose clamp (2).


If the engine harness is NOT contacting the heater inlet hose clamp, proceed to step 4.



If the engine harness is contacting the heater inlet hose clamp, proceed to the Engine Harness Repair Procedure
in this bulletin.

Page 2 of 14

Customer Satisfaction Program
48040 - Wire Harness To TCM Controller Wear-Thru Causing DTCs
To Set

4626701

4626703
4.

Verify the engine harness clip is secured in the correct location (1).


If the engine harness clip is secured in the correct location, proceed to the next step.



If the engine harness clip is NOT secured in the correct location, replace the engine harness clip and secure it in
the upper hole as shown above.

Page 3 of 14

Customer Satisfaction Program
48040 - Wire Harness To TCM Controller Wear-Thru Causing DTCs
To Set

4626706
5.

Remove the engine harness automatic transmission retainer from the bellhousing stud (1).

6.

Mark the location of the engine harness automatic transmission retainer and cut it off of the engine harness.

4626707
7.

Measure 25 mm (1 in) toward the outboard side of the vehicle and place a mark on the engine harness.

Page 4 of 14

Customer Satisfaction Program
48040 - Wire Harness To TCM Controller Wear-Thru Causing DTCs
To Set

4626708
8.

Install a NEW automatic transmission retainer (1) on the engine harness.

9.

Cut the excess off of the strap and secure to the automatic transmission bellhousing stud.

10. Install the right side warm up three-way catalytic converter. Refer to Warm Up Three-Way Catalytic Converter
Replacement (Right, LGW) in SI.
11. Lower the vehicle. Refer to Lifting and Jacking the Vehicle in SI.
3.6L Engine Harness Inspection Procedure
1.

Open the hood and install fender covers.

2.

Remove the intake manifold cover. Refer to Intake Manifold Cover Replacement (LGX).

4626710
3.

Verify the engine harness (1) is NOT contacting the heater inlet hose clamp (2).


If the engine harness is NOT contacting the heater inlet hose clamp, proceed to step 4.



If the engine harness is contacting the heater inlet hose clamp, proceed to the Engine Harness Repair Procedure
in this bulletin.

Page 5 of 14

Customer Satisfaction Program
48040 - Wire Harness To TCM Controller Wear-Thru Causing DTCs
To Set

4626711

4626703
4.

5.

Verify the engine harness clip is secured in the correct location (1).


If the engine harness clip is secured in the correct location, proceed to the next step.



If the engine harness clip is NOT secured in the correct location, replace the engine harness clip and secure it in
the upper hole as shown above.

Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI.
Warning: In order to avoid being burned, do not service the exhaust system while it is still hot. Service the system
when it is cool.
Warning: Avoid contact with HOT components. Wear safety glasses and protective gloves to avoid personal injury.

6.

Remove the warm up three-way catalytic converter. Refer to Warm Up Three-Way Catalytic Converter Replacement
(Right, LGX) in SI.

Page 6 of 14

Customer Satisfaction Program
48040 - Wire Harness To TCM Controller Wear-Thru Causing DTCs
To Set

4626706
7.

Remove the engine harness automatic transmission retainer from the bellhousing stud (1).

8.

Mark the location of the engine harness automatic transmission retainer and cut it off of the engine harness.

4626707
9.

Measure 25 mm (1 in) toward the outboard side of the vehicle and place a mark on the engine harness.

Page 7 of 14

Customer Satisfaction Program
48040 - Wire Harness To TCM Controller Wear-Thru Causing DTCs
To Set

4626708
10. Install a NEW automatic transmission retainer (1) on the engine harness.
11. Cut the excess off of the strap and secure to the automatic transmission bellhousing stud.
12. Install the warm up three-way catalytic converter. Refer to Warm Up Three-Way Catalytic Converter Replacement
(Right, LGX) in SI.
13. Install the intake manifold cover. Refer to Intake Manifold Cover Replacement (LGX).
14. Remove fender covers and close the hood.
Engine Harness Repair Procedure
1.

Remove the engine from the vehicle. Refer to Engine Replacement (LGX) or Engine Replacement (LGW).

4626715
2.

Remove the electrical tape from the affected area of the engine harness.
Note: If the engine wiring harness is damaged beyond repair, contact the GM Technical Assistance Center (TAC) for
further assistance.

3.

Repair the damaged wires. Refer to Wire to Wire Repair - Engine Controls and Fuel in SI.

4.

Wrap woven polyester electrical tape (PET) or equivalent anti-abrasion tape or electrical tape around the spliced
section of the engine harness wires.
Page 8 of 14

Customer Satisfaction Program
48040 - Wire Harness To TCM Controller Wear-Thru Causing DTCs
To Set

4626716
5.

Cut off the engine harness clip (1).

4626703
6.

Install a NEW engine harness clip and install in the upper hole (1).

Page 9 of 14

Customer Satisfaction Program
48040 - Wire Harness To TCM Controller Wear-Thru Causing DTCs
To Set

4626706
7.

Remove the engine harness automatic transmission retainer from the bellhousing stud (1).

8.

Mark the location of the engine harness automatic transmission retainer and cut it off of the engine harness.

4626707
9.

Measure 25 mm (1 in) toward the outboard side of the vehicle and place a mark on the engine harness.

Page 10 of 14

Customer Satisfaction Program
48040 - Wire Harness To TCM Controller Wear-Thru Causing DTCs
To Set

4626708
10. Install a NEW automatic transmission retainer (1) on the engine harness.
11. Cut the excess off of the strap and secure to the automatic transmission bellhousing stud.

4626717
12. Remove the heater inlet hose (1).
13. Install a NEW heater inlet hose.

Page 11 of 14

Customer Satisfaction Program
48040 - Wire Harness To TCM Controller Wear-Thru Causing DTCs
To Set

4626718
14. Position the front clamp in the 6 o’clock (down) position.
15. Install the engine into the vehicle. Refer to Engine Replacement (LGX) or Engine Replacement (LGW).
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, dealertraded, 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 December 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 followup 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 December 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, Sections 1.4 and 6.1.10, for
courtesy transportation program details.

Page 12 of 14

Customer Satisfaction Program
48040 - Wire Harness To TCM Controller Wear-Thru Causing DTCs
To Set
Customer Notification
USA & Canada - General Motors will notify customers of this program 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.

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 13 of 14

Customer Satisfaction Program
48040 - Wire Harness To TCM Controller Wear-Thru Causing DTCs
To Set
December 2016
This notice applies to your vehicle, VIN: ________________________________
Dear General Motors Customer:
We have learned that your 2016 model year Cadillac CT6 may have been built with a heater hose clamp at the right
rear of the engine compartment that may come into contact with the engine electrical harness. This contact may
eventually wear the harness causing the engine to run rough and have the potential for unwanted transmission
downshift, or loss of power steering assist.
Your satisfaction with your CT6 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 inspect your vehicle for engine harness clearance, install a revised engine
harness retainer, reorient the heater hose clamp if required, and repair or replace any affected wiring. This service will
be performed for you at no charge until December 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 concerns that your dealer is unable to resolve, please contact the appropriate Customer
Assistance Center at the number listed below.
Division
Cadillac
Puerto Rico – English
Puerto Rico – Español
Virgin Islands

Number
1-800-458-8006
1-800-496-9992
1-800-496-9993
1-800-496-9994

Text Telephones (TTY)
1-800-833-2622

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 CT6 provides you many miles of enjoyable
driving.
Terry M. Inch
Executive Director
Global Connected Customer Experience
48040

Page 14 of 14

GLOBAL SAFETY FIELD INVESTIGATIONS
DCS4260
URGENT - DISTRIBUTE IMMEDIATELY
Date:

November 17, 2016

Subject: 48040 - Customer Satisfaction Program
Wire Harness To TCM Controller Wear-Thru Causing DTCs To Set
Models: 2016 Cadillac CT6
To:

All General Motors Dealers

General Motors is releasing Customer Satisfaction Program 48040 today. The
total number of U.S. vehicles involved is approximately 501. Please see the
attached bulletin for details.
Customer Letter Mailing
The customer letter mailing will begin on December 5, 2016.
Global Warranty Management (GWM)
The Investigate Vehicle History (IVH) screen in the GWM system will be updated
November 18, 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