17408 (Bulletin

Service Update
17408 CT6 LGW Turbocharger Noise/Potential Failure
Reference Number:
Attention:
Release Date:
Revision:
N172123420
November 2017
00
This service update includes vehicles in dealer inventory and customer vehicles that return to the
dealership for any reason. This bulletin will expire at the end of the involved vehicle’s New Vehicle Limited
Warranty period.
Make
Cadillac
Model
CT6
Model Year
From
To
2016
2018
RPO
LGW
Description
3.0 V6 Twin-Turbo Engine
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
Potential turbo turbine wheel failure/MIL illuminated with DTC P0299 or P16E7.
Reprogram ECM with a new calibration.
Parts
No parts are required for this procedure.
Warranty Information
Labor
Operation
9102941*
9103492**
Description
Engine Control Module Reprogramming with SPS
Module Programming Not Required
Labor
Time
0.3
0.2
Trans.
Type
ZFAT
ZFAT
Net
Item
N/A
N/A
*To avoid warranty transaction rejections, the SPS Warranty Claim Code must be entered when submitting this
transaction.
** SPS Warranty Claim Code is NOT required when submitting this transaction.
Service Procedure
Note: Carefully read and follow the instructions below.

DO NOT attempt to order the calibration number from GM Customer Care and Aftersales. The calibration numbers
required for this service procedure are programmed into control modules via a Multiple Diagnostic Interface (MDI)
with the calibration update. If you cannot access the calibration, call the Techline Customer Support Center and it
will be provided.

DO NOT program a control module unless directed to by a service procedure or a service bulletin. If the control
module is not properly configured with the correct calibration software, the control module will not control all of the
vehicle features properly.

Ensure the programming tool is equipped with the latest software and is securely connected to the data link connector.
If there is an interruption during programming, programming failure or control module damage may occur.

Stable battery voltage is critical during programming. Any fluctuation, spiking, over voltage or loss of voltage will
interrupt programming. When required install the EL-49642 SPS Programming Support Tool to maintain system
voltage. If not available, connect a fully charged 12 V jumper or booster pack disconnected from the AC voltage
supply. DO NOT connect a battery charger.

Turn OFF or disable systems that may put a load on the vehicles battery such as; interior lights, exterior lights
(including daytime running lights), HVAC, radio, etc.

During the programming procedure, follow the SPS prompts for the correct ignition switch position.

Clear DTCs after programming is complete. Clearing powertrain DTCs will set the Inspection/Maintenance (I/M)
system status indicators to NO.

Refer to K20 Engine Control Module: Programming and Setup in SI for additional information on programming.
Note: If the Same Calibration/Software Warning is noted on the SPS Controller screen, do NOT attempt to program the
module. No further action is required. Refer to the Warranty section of the bulletin and use labor operation code 9103492,
Module Programming Not Required.
Copyright 2017 General Motors. All Rights Reserved.
Page 1 of 2
Service Update
17408 CT6 LGW Turbocharger Noise/Potential Failure
1.
Reprogram the engine control module. Refer to K20 Engine Control Module: Programming and Setup in SI.
2.
Record SPS Warranty Claim Code on job card for warranty transaction submission.
Dealer Responsibility
Whenever a vehicle subject to this service update enters your vehicle inventory, or is in your facility for service in the
future, and the vehicle is still covered under the New Vehicle Limited Warranty, you must take the steps necessary to be
sure the service update correction has been made before selling or releasing the vehicle.
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.
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 2
GLOBAL SAFETY FIELD INVESTIGATIONS
DCS4606
URGENT - DISTRIBUTE IMMEDIATELY
Date:
November 3rd, 2017
Subject: 17408 - Service Update
CT6 LGW Turbocharger Noise/Potential Failure
Models: 2016-2018 Cadillac CT6
Equipped with LGW (3.0 V6 Twin-Turbo Engine)
To:
All General Motors Dealers
General Motors is releasing Service Update 17408 today. The total number of
U.S. vehicles involved is approximately 5,200. Please see the attached
bulletin for details.
Global Warranty Management (GWM)
The Investigate Vehicle History (IVH) screen in the GWM system will be updated today,
November 3rd, 2017. A list of involved vehicles in dealer new inventory is attached to
this message. Please hold all warranty transactions until IVH has been updated.
END OF MESSAGE
GLOBAL SAFETY FIELD INVESTIGATIONS