Service Update
18169 10 Speed Transmission Delayed Shifting
Reference Number:
Attention:

Release Date:
Revision:

N182162210

May 2018
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
Chevrolet
GMC

Model
Escalade
Tahoe
Yukon / Yukon XL / Yukon
Denali / Yukon Denali XL

Model Year
From
To
2018

2018

RPO

Description

MF6
L86

Transmission, 10-Spd Automatic
6.2L V8 Ecotec3 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

Certain 2018 model year Cadillac Escalade, Chevrolet Tahoe, and GMC Yukon / Yukon XL / Yukon
Denali / Yukon Denali XL vehicles equipped with a 10-speed automatic transmission (RPO MF6), and a
6.2L engine (RPO L86) may experience a 2 to 3 second delayed engagement when shifting between
park, reverse, or drive (performing garage shifts). Customers may also experience a hard shift, with a
possible bang or clunk. If the vehicle is on an incline the customer may experience a short roll back due
to the hesitation.
Dealers are to reprogram the transmission control module (TCM) with an updated calibration.

Parts
No parts are required for this repair.
Warranty Information
Labor
Operation
9103696*
9103866**

Description
TCM Reprogramming with Service Programming System (SPS)
Module Programming Not Required

Labor
Time
0.7
0.2

Trans.
Type
ZFAT
ZFAT

Net
Item
N/A
N/A

* To avoid warranty transaction rejections, the SPS Warranty Claim Code(s) 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.

•

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 PSC-550 or EL49642 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.

•

Clear DTCs after programming is complete. Clearing powertrain DTCs will set the Inspection/Maintenance (I/M)
system status indicators to NO.

•

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
9103866, Module Programming Not Required.

1.

Reprogram transmission control module. Refer to K71 Transmission Control Module: Programming and Setup in SI.
•

Complete the Service Fast Learn Procedure through the TIS2Web Setup Procedure or through GDS Special
Functions after programming on these vehicles.

Copyright 2018 General Motors. All Rights Reserved.

Page 1 of 2

Service Update
18169 10 Speed Transmission Delayed Shifting
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
DCS4757
URGENT - DISTRIBUTE IMMEDIATELY
Date:

May 18, 2018

Subject: 18169 Service Update
10 Speed Transmission Delayed Shifting
Models: 2018 Cadillac Escalade, Chevrolet Tahoe, and GMC Yukon / Yukon
XL / Yukon Denali / Yukon Denali XL Equipped with:
•
•
To:

L86 (6.2L V8 Ecotec3 Engine)
MF6 (Transmission, 10-Spd Automatic)

All General Motors Dealers

General Motors is releasing Service Update 18169 today. The total number of
U.S. vehicles involved is approximately 36,404. Please see the attached
bulletin for details.
Global Warranty Management (GWM)
The Investigate Vehicle History (IVH) screen in the GWM system will be updated May,
19, 2018. 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