power steering CADILLAC CT4 2021 User Guide

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 12/4/20
234 DRIVING AND OPERATING
Caution
Spinning the tires or holding the
vehicle in one place on a hill using
only the accelerator pedal may
damage the transmission. The
repair will not be covered by the
vehicle warranty. If the vehicle is
stuck, do not spin the tires. When
stopping on a hill, use the brakes to
hold the vehicle in place.
Manual Mode (Mechanical
Shifter)
Tap ShiftCaution
Driving with the engine at a high
rpm without upshifting while using
Tap Shift, could damage the vehicle.
Always upshift when necessary
while using Tap Shift.
Vehicles with Tap Shift have controls
on the back of the steering wheel to
manually shift the automatic
transmission.
To enter Permanent Tap Shift Mode:1. Move the shift lever from D (Drive) to M (Manual Mode). While in Tap
Shift Mode, the M on the
instrument cluster will become
highlighted, and the current gear is
indicated.
2. Tap the left control to downshift, and the right control to upshift. To
shift to the lowest available gear,
press and hold the left control. 3. To exit, move the shift lever back
to D (Drive).
With the shift lever in D (Drive) and
not in Permanent Tap Shift Mode, the
tap shift controls will activate a
temporary tap manual shift mode,
allowing the transmission to be
manually shifted. While in Temporary
Tap Shift Mode, the D on the
instrument cluster will be highlighted
and the current gear shown.
Automatic shifts return after no
manual shifts have been done for
seven to 10 seconds. The Temporary
Tap Shift Mode can also be
deactivated by holding the right
upshift control briefly.
While using Tap Shift, the vehicle will
have firmer, quicker shifting. You can
use this for sport driving or when
climbing or descending hills, to stay in
gear longer, or to downshift for more
power or engine braking.
The transmission will only allow you
to shift into gears appropriate for the
vehicle speed and engine revolutions
per minute (rpm). The transmission
will not automatically shift to the next

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 12/4/20
236 DRIVING AND OPERATING
Temporary Tap Shift Mode
To enter Temporary Tap Shift Mode:1. With the transmission in D (Drive) and not in Permanent Tap Shift
Mode, the Tap Shift controls will
activate a Temporary Tap Shift
Mode, allowing the transmission to
be manually shifted. While in
Temporary Tap Shift Mode, the D
on the instrument cluster will be
highlighted and the current gear
shown.
2. To shift to the lowest available gear, press and hold the left
control.
3. To deactivate, hold the right control briefly. Automatic shifts
return after no manual shifts have
been done for seven to 10 seconds.
While using Tap Shift, the vehicle will
have firmer, quicker shifting. This can
be used for sport driving or when
climbing or descending hills, to stay in
gear longer, or to downshift for more
power or engine braking.
The transmission will only allow
shifting into gears appropriate for the
vehicle speed and engine revolutions per minute (rpm). If shifting is
prevented for any reason, the M or D
will flash in the instrument cluster.
The transmission will not
automatically shift to the next higher
gear if the engine rpm is too high.
It will only automatically shift to the
next lower gear if the engine rpm is
much too low.
Drive Systems
All-Wheel Drive
Vehicles with this feature always send
engine power to all four wheels. It is
fully automatic, and adjusts itself as
needed for road conditions.
Brakes
Electric Brake Boost
Vehicles equipped with electric brake
boost have hydraulic brake circuits
that are electronically controlled when
the brake pedal is applied during
normal operation. The system
performs routine tests and turns off
within a few minutes after the vehicle
is turned off. Noise may be heardduring this time. If the brake pedal is
pressed during the tests or when the
electric brake boost system is off, a
noticeable change in pedal force and
travel may be felt. This is normal.
Antilock Brake
System (ABS)
The Antilock Brake System (ABS)
helps prevent a braking skid and
maintain steering while braking hard.
If there is a problem with ABS, this
warning light stays on. See
Antilock
Brake System (ABS) Warning Light
0 100.
ABS does not change the time needed
to get a foot on the brake pedal and
does not always decrease stopping
distance. If you get too close to the
vehicle ahead, there will not be
enough time to apply the brakes if

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 12/4/20
DRIVING AND OPERATING 237
that vehicle suddenly slows or stops.
Always leave enough room ahead to
stop, even with ABS.
Using ABS
Do not pump the brakes. Just hold the
brake pedal down firmly. Hearing and
feeling ABS operate is normal.
Braking in Emergencies
ABS allows steering and braking at the
same time. In many emergencies,
steering can help even more than
braking.
Electric Parking Brake
The Electric Parking Brake (EPB) can
always be applied, even if the vehicle
is off. In case of insufficient electrical
power, the EPB cannot be applied or
released. To prevent draining the
battery, avoid unnecessary repeated
cycles of the EPB.
The system has a red parking brake
status light and an amber service
parking brake warning light. See
Electric Parking Brake Light0100 and
Service Electric Parking Brake Light
0 100. There are also parking
brake-related Driver Information
Center (DIC) messages.
Before leaving the vehicle, check the
red parking brake status light to
ensure that the parking brake is
applied.
EPB Apply
To apply the EPB:
1. Be sure the vehicle is at a complete stop.
2. Press the EPB switch momentarily.
The red parking brake status light will
flash and then stay on once the EPB is
fully applied. If the red parking brake status light flashes continuously, then
the EPB is only partially applied or
there is a problem with the EPB.
A DIC message will display. Release
the EPB and try to apply it again.
If the light does not come on, or keeps
flashing, have the vehicle serviced. Do
not drive the vehicle if the red parking
brake status light is flashing. See your
dealer.
If the amber service parking brake
warning light is on, press the EPB
switch. Continue to hold the switch
until the red parking brake status light
remains on. If the amber service
parking brake warning light is on, see
your dealer.
If the EPB is applied while the vehicle
is moving, the vehicle will decelerate
as long as the switch is pressed. If the
switch is pressed until the vehicle
comes to a stop, the EPB will remain
applied.
The vehicle may automatically apply
the EPB in some situations when the
vehicle is not moving. This is normal,
and is done to periodically check the

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 12/4/20
DRIVING AND OPERATING 243
My Mode
My Mode is used to personalize
everyday driving. This mode is
designed to allow the driver to
configure vehicle systems to their own
preference for city or normal driving.
Through the center stack, the
following vehicle systems may be
available for customization in
this mode.
.Engine Sound: Stealth, Tour
(Default), Sport, Track
.Steering: Tour (default), Sport,
Track
.Suspension: Tour (default), Sport,
Track
.Brake Response: Tour (default),
Sport, Track
For information on the range of
settings, see “Driver Mode
Customization ”. V-Mode (V-Series Only)
V-Mode is used to personalize
dynamic driving. This mode is
designed to allow the driver to
configure vehicle sub-systems to their
own preference for maximum
handling. V-Mode further enhances
the drivers experience by adding a
powertrain customization. Through
the center stack, the following vehicle
systems may be available for
customization in this mode.
.Engine Sound: Stealth, Tour, Sport
(default), Track
.Steering: Tour, Sport (default),
Track
.Suspension: Tour, Sport, (default),
Track
.Powertrain: Tour, Sport, (default),
Track, Snow/Ice
.PTM: OFF, WET, DRY, SPORT, RACE
1, RACE 2
.Brake Response: Tour, Sport, Track
For information on the range of
settings, see “Driver Mode
Customization ”.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 12/4/20
244 DRIVING AND OPERATING
Mode Selection Attributes
Modes:TOUR
Default SPORT TRACK SNOW/ICE
Powertrain TourTourTrack Snow/Ice
Throttle Progression TourTourTrack Snow/Ice
Transmission Shift Mode TourSport Track Tour
Engine Sound TourSport Track Tour
Steering TourSport Track Tour
Suspension (if equipped with Magnetic Ride
Control) Tour
Sport Track Tour
Traction and Stability Control TourTourTrack Tour
Competitive Driving Mode (if equipped) Not Available Available Not Available Not Available
Performance Traction Mode (if equipped) Not Available Not Available Available Not Available
Brake Response TourSport Track Tour
Throttle Progression
Adjusts throttle sensitivity by
selecting how quick or slow the
throttle reacts to input.
.Snow/Ice - The accelerator pedal
reduces engine torque at small
pedal inputs. This allows better
wheel control on slippery surfaces.
.Track - The accelerator pedal
adjusts to give maximum control
during the highest level of spirited
driving.
Transmission Shift Mode
Sport or Track –Dynamic
Performance Mode (DPM) allows the
transmission to hold the current gear after a quick release of a heavily
applied accelerator pedal. This
provides greater engine braking and
enhanced vehicle control without
using the paddles. DPM recognizes
aggressive cornering, heavy braking,
and high acceleration to select and

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 12/4/20
DRIVING AND OPERATING 245
hold lower gears when not using
paddles. The shifts are also firmer to
increase the quickness of shifting.
Engine Sound
Adjusts the volume of engine noise.
The sound level changes when the
variable exhaust valves open.
Steering (Assist Effort)
Adjusts from a lighter steering feel in
Tour Mode to reduced assist in Sport
and Track Mode for more
steering feel.
Magnetic Ride Control (If Equipped)
Adjusts the shock dampening
firmness from a comfort in Tour Mode
to an optimized responsiveness tune
in Sport and Track.
Stability Control
.Competitive Mode allows less
computer control to permit some
slide and drift and is selected with
the TCS/StabiliTrak button–only
available in Sport Mode.
.StabiliTrak/Electronic Stability
Control (ESC) can be turned off by
pressing and holding the TCS/
StabiliTrak button for five seconds.
Brake Response
Adjusts brake pedal sensitivity by
selecting how quick or slow the brakes
respond to input.
Driver Mode Customization
The following settings can be changed
using the Driver Mode Customization
Menu. See “Settings>Vehicle>Drive
Mode Customization ”in the center
stack to customize My Mode or
V-Mode.
Engine Sound
Engine sound adjusts the volume of
engine noise. The settings range from
quietest to loudest volume from
Stealth through Track.
–Stealth, Tour, Sport, Track Steering
Steering adjusts the effort required to
turn the steering wheel. The steering
wheel offers better feedback in the
Tour setting, but requires more effort
in the Sport and Track settings.
–Tour, Sport, Track
Suspension
Suspension adjusts the firmness of the
suspension in the vehicle. Suspension
adjusts the stiffness of the shocks and
/ or springs. The ride is more
comfortable at lower settings and is
stiffer at higher settings for better
control.
–Tour, Sport, Track
Powertrain
Powertrain adjusts the throttle
response, gear shifting and engine
performance. Throttle response
increases in the Sport, Track, and
Snow/Ice settings, and gear shifting is
more aggressive.
–Tour, Sport, Track, Snow/Ice

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 12/4/20
DRIVING AND OPERATING 247
Selecting PTM states may modify
other V-Mode customization options.
Off, Wet, Dry, Sport, Race 1, Race 2.
PTM 1–WET
.Intended for all driver skill levels.
.Wet or damp conditions only —not
intended for use in heavy rain or
standing water.
.StabiliTrak/ESC is on and engine
power is reduced based on
conditions.
PTM 2 –DRY
.For use by less experienced drivers
or while learning a new track.
.Dry conditions only.
.StabiliTrak/ESC is on and engine
power is slightly reduced.
PTM 3 –SPORT
.For use by drivers who are familiar
with the track.
.Dry conditions only.
.Requires more driving skill than
mode 2.
.StabiliTrak/ESC is on and more
engine power is available than in
mode 2. PTM 4
–RACE 1
.For use by drivers who are familiar
with the track.
.Dry conditions only.
.Requires more driving skill than
modes 2 or 3.
.StabiliTrak/ESC is off and available
engine power is the same as
mode 3.
PTM 5 –RACE 2
.For use by experienced drivers who
are familiar with the track.
.Dry conditions only.
.Requires more driving skill than in
other modes.
.StabiliTrak/ESC is off and engine
power is available for maximum
cornering speed.
Press and release
gto turn off PTM
and return to the TCS and StabiliTrak/
ESC systems. The traction off light
i
and StabiliTrak Off lightiwill
go out.
Launch Control
If equipped, Launch Control is
available within Competitive Driving
Mode and Performance Traction
Management (PTM) to allow high
levels of vehicle acceleration in a
straight line. Launch Control is a form
of traction control that manages tire
spin while launching the vehicle. This
feature is intended for use during
closed course race events where
consistent zero to 60 and quarter mile
times are desirable.
Launch Control is only available when
the following criteria are met:
.Competitive Driving Mode is
selected or any of the Performance
Traction Management modes are
selected. The traction off light
comes on in the instrument cluster
and the appropriate Driver
Information Center (DIC) message
displays.
.The vehicle is not moving.
.The steering wheel is pointing
straight.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 11/23/20
336 VEHICLE CARE
FusesUsage
13 –
14 –
15 –
16 –
17 –
18 Display/Infotainment/ USB/Multi-function
control module
19 Airbag/ Automatic occupant sensing /
Data link connection/
Wireless charging
module/ Virtual key
module
20 Power steering column module/
Electronic steering
column lock 2
21 Driver monitor system/Performance
data recorder
22 –
23 –
24 – Fuses
Usage
25 USB
26 –
27 –
28 –
29 –
30 –
31 Headlamp level
32 –
33 Body ignition/IP ignition
34 Exhaust valve
35 Transmission control module ignition/
Engine control
module ignition/Shift
ignition/Brake
ignition
36 Shift module
37 Body control module 1/Electronic
park brake switch
38 Center stack module Fuses
Usage
39 Steering wheel controls
40 Body control module 2
41 Body control module 3
42 Body control module 4
Circuit
Breakers Usage
CB1 Auxiliary power outlet 1
CB2 Auxiliary power outlet 2
Relays Usage
1 Run after park/ Accessory
2 Run crank
3 –
4 –
5 –

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 11/23/20
374 VEHICLE CARE
Caution
To avoid surface damage on wheels
and wheel trim, do not use strong
soaps, chemicals, abrasive polishes,
cleaners, or brushes. Use only GM
approved cleaners. Do not drive the
vehicle through an automatic car
wash that uses silicon carbide tire/
wheel cleaning brushes. Damage
could occur and the repairs would
not be covered by the vehicle
warranty.
Brake System
Visually inspect brake lines and hoses
for proper hook-up, binding, leaks,
cracks, chafing, etc. Inspect disc brake
pads for wear and rotors for surface
condition. Inspect drum brake linings/
shoes for wear or cracks. Inspect all
other brake parts.
Steering, Suspension, and
Chassis Components
Visually inspect steering, suspension,
and chassis components for damaged,
loose, or missing parts or signs of
wear at least once a year.Inspect power steering for proper
attachment, connections, binding,
leaks, cracks, chafing, etc.
Visually check constant velocity joint
boots and axle seals for leaks.
Body Component Lubrication
Lubricate all key lock cylinders, hood
hinges, liftgate hinges, and the steel
fuel door hinge, unless the
components are plastic. Applying
silicone grease on weatherstrips with a
clean cloth will make them last
longer, seal better, and not stick or
squeak.
Underbody Maintenance
At least twice a year, spring and fall,
use plain water to flush any corrosive
materials from the underbody. Take
care to thoroughly clean any areas
where mud and other debris can
collect.
Do not directly power wash the
transfer case and/or front/rear axle
output seals. High pressure water can
overcome the seals and contaminate
the fluid. Contaminated fluid will
decrease the life of the transfer case
and/or axles and should be replaced
Sheet Metal Damage
If the vehicle is damaged and requires
sheet metal repair or replacement,
make sure the body repair shop
applies anti-corrosion material to
parts repaired or replaced to restore
corrosion protection.
Original manufacturer replacement
parts will provide the corrosion
protection while maintaining the
vehicle warranty.
Finish Damage
Quickly repair minor chips and
scratches with touch-up materials
available from your dealer to avoid
corrosion. Larger areas of finish
damage can be corrected in your
dealer's body and paint shop.
Chemical Paint Spotting
Airborne pollutants can fall upon and
attack painted vehicle surfaces
causing blotchy, ring-shaped
discolorations, and small, irregular

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 11/23/20
SERVICE AND MAINTENANCE 381
oil life system must be reset. Your
trained dealer technician can perform
this work. If the engine oil life system
is reset accidentally, service the
vehicle within 5 000 km (3,000 mi)
since the last service. Reset the oil life
system when the oil is changed. See
Engine Oil Life System0314.
Air Conditioning Desiccant
(Replace Every Seven Years)
The air conditioning system requires
maintenance every seven years. This
service requires replacement of the
desiccant to help the longevity and
efficient operation of the air
conditioning system. This service can
be complex. See your dealer.
Tire Rotation and Required
Services Every 12 000 km
(7,500 mi)
Rotate the tires, if recommended for
the vehicle, and perform the following
services. See Tire Rotation0352.
.Check engine oil level and oil
life percentage. If needed, change
engine oil and filter, and reset oil
life system. See Engine Oil0312 and
Engine Oil Life System 0314.
.If equipped, check the air filter
life percentage. If necessary, replace
the engine air filter and reset the
engine air filter life system. See
Engine Air Filter Life System 0315.
If the vehicle is not equipped with
the engine air filter life system,
inspect the engine air cleaner filter.
See Engine Air Cleaner/Filter 0316.
.Check engine coolant level. See
Cooling System 0317.
.Check windshield washer fluid level.
See Washer Fluid 0323.
.Check tire inflation pressures. See
Tire Pressure 0346.
.Inspect tire wear. See Tire Inspection
0 352.
.Visually check for fluid leaks.
.Inspect brake system. See Exterior
Care 0370.
.Visually inspect steering,
suspension, and chassis
components for damage, including
cracks or tears in the rubber boots,
loose or missing parts, or signs of
wear at least once a year. See
Exterior Care 0370.
.Inspect power steering for proper
attachment, connections, binding,
leaks, cracks, chafing, etc.