240-pixel TFT-LCD display with 171-pixels per inch,
combined with a HD camera designed specifically to
enhance rear view lane width and maximize low-light
situations. A water-shedding hydrophobic coating is
applied to the camera to keep it clean to maintain
visibility regardless of the driving conditions.
Drivers can disable the mirror’s video streaming
function by flipping the toggle on the underside of the
mirror. This will revert it to a traditional electrochromatic
rearview mirror.
Streaming Video Mirror Vision Zone

Safety — Rear Camera Mirror with
Streaming Video

4446663

1.
2.
3.
4.
5.

4446638

Blind Zone.
Streaming Video in Rearview Mirror.
Blind Zone.
Traditional Rearview Mirror Vision Zone.
Streaming Video Mirror Vision Zone

Bulletin No.: 16-NA-112

April, 2016

Page 17

Rear Camera Mirror — Camera Location

4479192

The camera that provides the Rear Camera Mirror
image is above the license plate, next to the Rear
Vision Camera (RVC).

Safety — Surround Vision and
Triggered Video Recording
Surround Vision
Notice: The Surround Vision cameras have blind
spots and will not display all objects near the
corners of the vehicle. Folding side mirrors that are
out of position will not display the surround view
correctly.
Surround Vision displays an image of the area
surrounding the vehicle, along with the front or rear
camera views in the center stack. The front camera is in
the grille or near the front emblem, the side cameras
are on the bottom of the outside rearview mirrors, and
the rear camera is above the license plate.

4451337

1 = Areas displayed by the Surround Vision cameras.
2 = Areas not displayed by the Surround Vision
cameras.
Triggered Video Recording
In select markets, the CT6 will be equipped with the
world’s first surround view integrated video recorder.
Called “Triggered Video Recording”, the feature
enables the vehicle’s four-camera, 360-degree camera/
recording capability – an enabler to gathering
information relating to traffic/security events. Playback
is via the CT6’s 10.2-inch (259 mm) CUE display.
The system records the 360° camera views to an SD
card. Only images are recorded, no sound. An SD card
will be needed for this system. The recommended SD
card is an 8-32GB SDHC card with FAT32 file system,
Class 4 and over.

Page 18

April, 2016

Bulletin No.: 16-NA-112

Insert the SD card into the card reader located in the
trunk. Opening the trunk will disable recording to safely
remove the SD card. Other files should not be stored on
the same SD card as the surround vision recorder files.
Storing other files on the same card may increase
recording start up and playback time or result in a loss
of data. There are approximately 12 hours of video
storage based on an 8GB SD card. This could vary
based on exterior lighting conditions. The recorded
video is stored in five minute long files.

Steering — Active Rear Steering
Overview
The Cadillac CT6 is equipped with an electric power
steering system that uses a rack-mounted electric
motor. This type of system maximizes driveability and
directional stability, which helps ensure the driver’s
comfort and safety. The electric power steering system
provides steering assist to the driver by using an
electric motor rather than a conventional hydraulic
power steering pump. The power steering control
module uses a combination of inputs from the torque
sensor and motor rotational sensor, as well as vehicle
speed, to determine the amount of assist required to
steer the vehicle.
Active Rear Steering
Active Rear Steering (ARS) is standard on the Platinum
edition and offered as an option on the Luxury and
Premium vehicles. This will be part of the Active
Chassis package. The ARS system improves
low-speed maneuverability and increases agility at
higher speeds. At low speeds, the rear wheels will turn
in the opposite direction of the front wheels. The
system allows the rear wheels to turn in unison with the
front wheels at higher speeds, which helps the vehicle
change direction much better. The result is a full-size
car that handles like a mid-size sports sedan.
Active Rear Steering Smart Actuator
The ARS system consists of a smart actuator that
contains the control module and motor and the linkage
that transmits the force from the actuator to the rear
steering knuckle and wheels. The ARS system is
controlled by the electronic brake control module
(EBCM), which uses inputs including vehicle speed,
steering wheel angle sensor, and steering wheel angle
rate of change to determine the correct rear wheel
steering angle. The EBCM uses the Chassis GMLAN
bus to command the Rear Wheel Steering Control
Module (RWSCM) to turn the rear wheels. The
RWSCM provides feedback to the EBCM over the
Chassis GMLAN bus for the steering position and rate
of change. The ARS system can mechanically move
4.6° but the controller limits movement to 3.5°. Below
22.3 mph (36 km/h) the rear wheels are turned out of
phase with the front wheels in both forward and
reverse. Above 22.3 mph (36 km/h) the rear wheels
steer in phase with the front wheels.

4482176

1. Rear Cradle
2. Actuator: 12V Electro-mechanical actuator
directly controls rear wheel angles
3. Toe Links

Structure
For the CT6, engineers developed new body
construction techniques and technologies allowing
various types of advanced and lightweight materials to
be combined within the manufacturing environment,
including proprietary aluminum spot welding technology
that is more efficient and helps reduce weight. Laser
welding, flow drill fasteners and self-piercing rivets are
also employed, along with roughly 591 feet
(180 meters) of advanced structural adhesives.
Thirteen high-pressure aluminum die castings in the
lower body construction reduce complexity and are
significant contributors to the architecture’s low mass.
The CT6 has all aluminum exterior body panels.

Bulletin No.: 16-NA-112

April, 2016

Page 19

Front Suspension

4484853

•
•

1 = Aluminum
2 = Steel

Suspension
Electronic Suspension Control System
The 2016 Cadillac CT6 is available with electronic
suspension control. The rigid body structure firmly
resists twisting forces and provides a solid foundation
for the front and rear frames and the suspension
system. The CT6 offers selectable-mode magnetic ride
control that utilizes magneto-rheological technology.
The vehicle has 3 modes which are Tour, Sport and
Snow / Ice that are user selectable and change the
characteristics of the suspension system. The
electronic suspension control system utilizes the latest
generation in magneto rheological technology to
independently control each of the shock absorbers and
struts. Magneto-rheological technology independently
controls the fluid viscosity in each strut and shock
absorber. Front struts and rear shock absorbers contain
an internal electrical coil and micron-sized metal
particles in the magneto-rheological fluid. The
suspension control module uses pulse width modulated
(PWM) current to the electric coil within each strut or
shock. The PWM current increases the fluid viscosity
by aligning the metal particles within it, which increases
or decreases the suspension damping force during
both compression and rebound.

4481463

The CT6 comes equipped with a high arm multi-link
short/long arm suspension. The control arms are made
from forged aluminum to reduce weight. The multi-link
suspension replaces the lower control arms with two
lower links. This allows for improved steering feel and
improved ride.
• Dark Blue: Cast Aluminum
• Light Blue: Wrought Aluminum
Rear Suspension

4481563

The 5-link rear suspension uses forged aluminum
control links to increase strength and reduce weight.
The long suspension links minimize caster and camber
change. Multiple outer ball joints and cross-braces
improve handling, steering precision, and agility.
• Dark Blue: Cast Aluminum
• Light Blue: Wrought Aluminum

Page 20

April, 2016

Bulletin No.: 16-NA-112

Transfer Case — Rear-Wheel Drive and
All-Wheel Drive

Front and Rear Frames

Overview
The driveline in the 2016 Cadillac CT6 uses either a
rear-wheel drive (RWD) or an all-wheel drive (AWD)
configuration. The RWD configuration uses a
longitudinally mounted engine and transmission to
transfer power through the two-piece propeller shaft to
the rear drive axle. The AWD configuration adds an
active transfer case after the transmission that splits
the power between the one-piece front propeller shaft
and the two-piece rear propeller shaft. AWD is standard
on all V6 models.
Transfer Case

4481234

Front Frame
The individual underbody components contribute
directly to the overall strength of the unibody, as well as
to the overall handling performance of the vehicle. The
front and rear cradles are a hollow-cast aluminum to
reduce weight. The front and rear frames serve as a
foundation for the front and rear suspension. The
frames are also an integral part of the unibody
structure. The front frame serves as a foundation for the
front suspension and for the front axle on all-wheel
drive (AWD) equipped vehicles.

4481166

The CT6 AWD features a Magna model MP 3713G
one-speed transfer case. Software calibrations tune an
on-demand torque biasing friction clutch. When a driver
enters a turn, clutch torque decreases based on the
various GM LAN inputs, such as steering angle and
vehicle speed to prevent crowhop or driveline binding
from occurring at low speeds.

4481345

Rear Frame
The rear frame, which attaches to the body rail through
rubber insulators, is the foundation for the rear
suspension components and the rear axle.

Bulletin No.: 16-NA-112

April, 2016

Page 21

Transfer Case Clutch

4481052

4481126

The torque split between the front and rear axle is not
fixed, which differs from an open center differential
transfer case. The active design can transfer 0 to
100 percent of the torque to the front axle. The torque
transfer is adjusted based on multiple inputs including:
wheel slip, engine speed, throttle position, transmission
gear and the selected driving mode. Torque is moved to
the front axle through an active wet clutch within the
transfer case. The actuator motor to turns a worm gear
that rotates the shift shaft that actuates a scissor
mechanism and applies the clutch.

Transmissions — HydraMatic™ 8L45
Automatic 8-Speed Transmission —
RPO M5N and 8L90 Automatic 8-Speed
Transmission — RPO M5X

4479842

Typical view of the 8L45

Typical view of the 8L90
HydraMatic™ 8L45 and 8L90
The all new, GM developed HydraMatic™ 8L45/8L90
eight-speed automatic transmission packaged on the
CT6 enhances performance and efficiency, while
delivering exceptional refinement and world-class shift
responsiveness that rivals the world’s best dual-clutch
transmissions.
With four simple gearsets for optimal efficiency and five
clutches (two brake clutches and three rotating
clutches), creative packaging enables the new
eight-speed automatic to fit the same space as
previous six-speed automatics – and the powerflow
only has two open clutches per gear for low spin
losses, enhancing efficiency. Extensive use of
aluminum and magnesium also make it similar in mass
to six-speed configurations. The greater overall
performance and efficiency enabled by the 8L45/8L90
in the CT6 is due in part to a new, wider 7.0 overall gear
ratio spread, which enhances off-the-line performance
with a more aggressive first gear ratio of 4.56, helping
achieve quicker 0-60 mph (0-97 km/h) times.
For performance driving, the transmission offers full
manual control via steering wheel paddles. A new
transmission controls system and unique algorithms
deliver shift performance that rivals the dual-clutch/
semi-automatic transmissions found in many high
performance cars, but with the smoothness and
refinement that comes with a conventional automatic
fitted with a torque converter.
A new, Gen III transmission controller analyzes and
executes commands 160 times per second. Smaller
steps between gears keep the engine within the sweet
spot of the RPM band, making the most of its
horsepower and torque to optimize performance and
efficiency. Additionally, a torque converter design with a
turbine damper complements performance with
excellent refinement at low RPM.

Page 22

April, 2016

8L45 and 8L90 Application
The 8L45 will be mated with the 2.0L Turbo and the
3.6L V6 engine and the 8L90, which is designed and
tuned for higher power outputs, is matched with the
3.0L V6 twin turbocharged engine.
When inspecting the transmission fluid level, refer
to this procedure: Transmission Fluid Level and
Condition Check in SI

Towing the Vehicle — Recreational
Vehicle Towing
Towing the Vehicle
Have the vehicle towed on a flatbed car carrier. A wheel
lift tow truck could damage the vehicle.
Recreational Vehicle Towing
Recreational vehicle towing means towing the vehicle
behind another vehicle such as a motor home. If the
vehicle must be towed, a dolly should be used.
Vehicles with all-wheel drive cannot be dolly towed.
To dolly tow a rear-wheel drive vehicle from the rear
perform the following:
1. Attach the dolly to the tow vehicle following the
dolly manufacturer instructions.
2. Put the rear wheels on the dolly.
3. Shift the transmission to P (Park).

Bulletin No.: 16-NA-112

4. Firmly set the parking brake.
5. Use an adequate clamping device designed for
towing to ensure that the front wheels are locked
into the straight-ahead position.
6. Secure the vehicle to the dolly following the
manufacturer instructions.
7. Release the parking brake only after the vehicle
being towed is firmly attached to the towing
vehicle.
8. Turn OFF the ignition.
In the Event of a Collision
In the event of a collision, CT6 vehicles requiring
structural repairs should be sent to a Cadillac
Aluminum Repair Network (CARN) facility. These
approved facilities have the training, equipment and
tools necessary to properly perform structural repairs,
restoring the vehicle as close to its pre-collision
condition as possible. In Canada, Cadillac dealers that
determine a CT6 requires structural repair or quarter
panel replacement should refer the vehicle to one of the
Cadillac certified aluminum repair facilities in Canada.

__________________________________________________________________

Special Tools
The following new tools were released for the
2016 CT6:

Special Tools — Tool Number and Description
Tool Number

Description

CH-50732-A

Strut Rod Nut Wrench

DT-50806-10

Bushing Replacer Adapter

DT-51263

Pinion Flange Installer

DT-51750

Pinion Seal Installer (RDM)

J-28540-A

RDM Output Seal Installer

DT-51976

FDU Output Seal Installer

DT-51977

FDU Pinion Seal Installer

J-44467

FDU Intermediate Shaft Remover

Training Courses
The majority of the systems found on this vehicle are
taught in GM’s core curriculum from a conceptual
theory and operation perspective. The North American
technical training core curriculum structure is system
based.

To access all of the available training courses in the
United States, visit the following website:
www.centerlearning.com
In Canada, Go to GM GlobalConnect and select
Centre of Learning

Bulletin No.: 16-NA-112

April, 2016

Page 23

Training Course Name or System — Course Number and Description
Course Name or System

Course Number and Description

New Model Feature
2016 Cadillac CT6 New Model Feature

#10316.65W — 2016 Cadillac CT6 New Model Feature (United
States and Canada)

Engine
Gasoline, 4 Cylinder L4, 2.0L, SIDI, DOHC, VVT, DCVCP,
TURBOCHARGED — RPO LTG
Gasoline, 6 CYL, V6, 3.0L, DI, DOHC, VVT, TWIN
TURBOCHARGED — RPO LGW
Gasoline, 6 Cylinder, V6, 3.6L, DI, DOHC, VVT — RPO LGX

#16440.17D-V — Engines: New and Updates for RPOs LCV,
LTG, LL0 (United States Only)
#16043.16H — Gen 2 Overhaul/Repair Certification
(Canada Only)
#16440.20D — Engines: New and Updates for RPOs LF4,
LGX, LGW, L3A, LV7, LE2 and LWN (United States Only)

Transmission
HydraMatic™ 8-Speed Automatic Transmissions — RPO M5N
and M5X

#17440.16D (VCT) — Transmissions: New and Updates for
Aisin AF50-8, 8L45/8L90 Automatic Transmissions (United
States Only)
#17038.05D1/D2 — 8L90 Transmission Operation and
Diagnosis (Canada Only)
#17038.06V — 8L90 Unit Repair (Canada Only)

Safety Systems Forward Collision Alert / Lane Departure
Warning and Rear Vision Camera

#22048.42W1-W3 GM Safety Systems 1-3 (United States and
Canada)

Version Information
Version

1

Modified

—

Trademark Footnotes
Apple® is a Registered Trademark of Apple Inc.
Bose® is a Registered Trademark of the Bose
Corporation
Bose® Panaray® is a Registered Trademark of the
Bose Corporation
Bose® VideoWave® and Articulated Array® are
Registered Trademarks of the Bose Corporation
The Bluetooth® Word Mark and Logos are
Registered Trademarks Owned by Bluetooth
SIG, Inc.
dexos® is a Registered Trademark of General
Motors LLC

dexos1® Icons are Registered Logos of General
Motors LLC
Google® is a Registered Trademark of Google Inc.
HydraMatic™ is a Trademark of General
Motors LLC
iPhone® is a Registered Trademark of Apple Inc.
OnStar® is a Registered Trademark of OnStar LLC
Siri® Eyes Free Voice Recognition Software is a
Registered Trademark of Apple Inc.
Siri® is a Registered Trademark of Apple Inc.
StabiliTrak® is a Registered Trademark of General
Motors LLC

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 equipment, tools, 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 GM dealer for information on whether your vehicle may benefit from the
information.

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