NHTSA ID Number: 10183209
Manufacturer Communication Number: 20NA211
TSB/Document Date: 2020-11-30
Summary
2021 Cadillac
Escalade New Model Features
does not automatically increase ground clearance.
AERO
This mode also is not programmable in the configurable
settings, but may be manually selected by the driver
when the transfer case setting is in 4-LO. Only
available on four-wheel drive vehicles, this mode
increases ride height by 51 mm (2 in.). This feature
does not automatically increase ground clearance.
A SERVICE LEVELING UNAVAILABLE message may
display for any of the following reasons:
• system thermal conditions
• system voltage is too low but above the Diagnostic
Trouble Code (DTC) threshold
• various inhibits or safety situations that do not
allow the system to respond to a target height
change
Service Considerations
Service Mode Setting
Bulletin No.: 20-NA-211
Alignment Mode
Alignment mode optimizes the vehicle height to provide
the most accurate wheel alignment. Enable this mode
when the vehicle is driven onto the alignment rack.
To enable alignment mode, ensure the vehicle is at
normal ride height and shift the vehicle into NEUTRAL.
Alignment mode automatically disables when vehicle
speed exceeds 16 km/h (10 MPH).
Alignment mode can be manually enabled and disabled
through the infotainment center. Select the Suspension
option under the Settings/Vehicle menu and place the
transmission in the NEUTRAL position.
Air Suspension Operation with Door(s) or
Hood Open
The air suspension temporarily suspends all height
changes while the hood or any door is open.
System Over-Temperature
If the air suspension is under heavy use, the system
may temporarily suspend all height changes to allow
the air compressor to cool. During this time, if a height
change is requested, the LEVELING SYSTEM
UNAVAILABLE message will display in the driver
information center.
Suspension Lowered for Stability
If a malfunction in the electronic stability control system
occurs, the air suspension lowers the vehicle at higher
speeds to provide increased stability. The driver
information center may display a VEHICLE
LOWERING FOR STABILITY message.
Excessive Vehicle Loading
If the air suspension detects excessive vehicle loading,
ride height is limited to Normal Height mode.
Air Suspension Service
If the driver information center displays the SERVICE
LEVELING SYSTEM message, the owner should be
advised to bring the vehicle to an authorized dealer
immediately.
Electronic Suspension Control System
5619593
When the air suspension system is in service mode, all
air suspension operations, including raising and
lowering the vehicle and air compressor operation, are
disabled. Service mode is useful when the vehicle is
being towed on a flat bed or during vehicle service
when the vehicle is placed on the hoist.
Service mode automatically enables when the vehicle
is raised on a hoist or a floor jack. Service mode
automatically disables when vehicle speed exceeds 16
km/h (10 MPH). Service mode can be manually
enabled and disabled easily through the infotainment
center by selecting the Suspension option under the
Settings/Vehicle menu.
Note: If the vehicle automatically enters suspension
service mode, the vehicle must be driven at a speed of
16 km/h (10 MPH) to disable service mode, or manually
disable service mode using GDS2.
The electronic suspension control system individually
controls the damping force of four shock absorbers in
order to keep the vehicle's body as steady as possible.
Changes of the damping forces take milliseconds.
Suspension characteristics can be changed at any time
by activating the sport mode or tour mode.
The electronic suspension control system consists of
the following major components:
• suspension control module
• four corner vertical accelerometers
• four shock absorber actuators, which are
integrated within the shock absorbers
The suspension control module controls the damping
forces according to the following factors:
• vehicle speed
• steering wheel position
• engine torque
• brake pressure
Bulletin No.: 20-NA-211
October, 2020
The suspension control module evaluates these inputs
to control the shock absorbers separately, providing an
enhanced ride and comfort level over the widest
possible range of operating conditions.
Suspension Control Module
The suspension control module controls the system
functions and detects failures. The suspension control
module receives serial data input information from the
four suspension vertical accelerometers that are
directly connected to the module and by other systems.
The suspension control module commands variable
levels of current to each shock absorber actuator.
Suspension Vertical Accelerometers
The vertical accelerometers measure the change in
velocity, or rate of suspension movement. The
suspension control module can adjust the suspension
damping based on the vertical accelerometer’s input.
The suspension control module supplies a common 5
volt reference and a ground circuit to each of the four
corner vertical accelerometers. The accelerometers
supply a signal of 0.3–4.7 volts to the suspension
control module.
Shock Absorber Actuators
The shock absorber actuators are integrated within the
shock absorbers. The electronic suspension control
system uses a proportional valve that is located in the
external bypass of the displacement module.
Adjustment is performed by current control. The current
range is 0–5 amps. The actuators respond to
commands of the suspension control module within
milliseconds.
Driver Information Center Message
The electronic suspension control system uses the
instrument cluster for the display functions. When the
suspension control module detects a fault that sets a
DTC, it sends a message on the serial data line to the
instrument cluster, which will display the SERVICE
SUSPENSION SYSTEM message.
The suspension control module has the ability to store
DTCs as current or history codes. Most electronic
suspension control system malfunctions will display a
message in the instrument cluster and set a DTC. As
long as the DTC is present, the message will be
displayed.
Actions taken when a malfunction is detected remain
until the ignition is turned OFF, even if the malfunction
is not present anymore.
If a malfunction is no longer present, the DTC is stored
as a history code. After 40 consecutive malfunction-free
ignition cycles the DTC is erased.
Wheel and Tire Features
Various wheel and tire combinations are available for
the 2021 Cadillac Escalade. All vehicles include a
spare tire and wheel changing tools mounted in a well
under the rear cargo compartment.
Page 61
Tire Pressure Monitoring System with Tire Fill Alert
The tire pressure monitoring system warns the driver
when a significant loss or gain of tire pressure occurs in
any of the four tires. The driver can choose to display
individual tire pressures and their locations on the
driver information center.
The tire pressure monitoring system uses the Body
Control Module (BCM), remote control door lock
receiver, driver information center, instrument panel
cluster, a Radio Frequency (RF) transmitting pressure
sensor in each wheel/tire assembly, and the serial data
circuit to perform the system functions. Each sensor
has an internal power supply.
The tire pressure monitoring system also features a tire
fill alert, with visual and audible alerts (light flashes and
horn chirps). The alerts assist inflates an underinflated
tire to the recommended tire pressure without the need
to check a gauge or the instrument panel. Tire fill alert
only functions once the tire pressure is low enough to
trigger the Malfunction Indicator Lamp (MIL) on the
dashboard. When the driver starts filling the
underinflated tire, the corner lamp nearest to that tire
will begin to flash. When the recommended pressure is
reached, the horn sounds once and the turn signal
lamps stop flashing and briefly turn solid. If the tire is
overinflated by more than 35 kPa (5 psi), the horn will
sound multiple times and the turn signal lamp will
continue to flash for several seconds after filling stops.
To release and correct the pressure, while the turn
signal lamp is still flashing, briefly press the center of
the valve stem. When the recommended pressure is
reached, the horn sounds once.
If the BCM detects a low tire pressure condition or a
malfunction in the system, it will send a serial data
message to the instrument cluster requesting the
appropriate tire pressure monitor indicator to illuminate
as well as the appropriate data message to display on
the driver information center, if equipped. Both the
indicator icon and driver information center message
can be cleared by adjusting the tire pressures to the
recommended pressures and driving the vehicle above
40 km/h (25 MPH) for at least 2 minutes.
Service Considerations
If power is disconnected from the BCM, or if the vehicle
battery is disconnected, each tire pressure monitor
sensor’s identification is retained, but all tire pressure
information is lost. Under these circumstances, the
BCM cannot assume that the tire pressures were
maintained over an unknown period. The driver
information center displays all dashes and the scan tool
indicates a default tire pressure value of 220 kPa (32
PSI) for each tire. Driving the vehicle above 40 km/
h (25 MPH) for at least 2 minutes activates the sensors
and sends the correct tire pressures to the driver
information center. The tire pressure monitor
diagnostic/sensor activation tool, or equivalent, may
also activate the tire pressure sensors.
The BCM has the ability to detect malfunctions within
the tire pressure monitor system. In the event a DTC is
set, the tire pressure monitor indicator icon on the
instrument cluster flashes for 1 minute and remains
illuminated for the remainder of the key cycle. After the
instrument cluster bulb check has been completed, the
Page 62
October, 2020
indicator flashes again for 1 minute and remains
illuminated if the DTC remains current. Any malfunction
detected causes the driver information center to display
a SERVICE TIRE PRESSURE MONITOR SYSTEM
message.
Tire Pressure Monitoring System Learn Procedure
The tire pressure monitor sensor learn procedure must
be performed after every tire rotation, BCM
replacement, or tire pressure sensor replacement.
Tire Pressure Monitor Learn Procedure Steps
The tire pressure monitor sensor and Radio Frequency
(RF) diagnostic tool allow the tire pressure sensors to
be learned without transmitting RF data between the
tire pressure sensors and the vehicle. When using the
diagnostic tool, each tire pressure sensor identification
is learned to the diagnostic tool and stored internally.
The diagnostic tool connects to the vehicle DLC using
the OBD2 interface module, which is part of the
diagnostic tool kit. Next, the stored tire pressure sensor
information is loaded into the BCM to learn the tire
pressure sensors to prevent the vehicle from learning
errant nearby tire pressure sensor information from
other vehicles in the service facility, especially if the tire
pressure sensor batteries are low. This is the new GM
recommended method to learn tire pressure sensors.
Bulletin No.: 20-NA-211
In order for the steering column to lock, the steering
column lock module must receive three inputs:
1. The BCM power mode is off.
2. The vehicle is stationary based on zero speed
reported from all Antilock Braking System (ABS)
wheel speed sensors.
3. The driver or passenger door is opened as
reported by the BCM.
The steering column lock module monitors the column
lock system; if a malfunction is detected, a Diagnostic
Trouble Codes (DTCs) is set. In addition, the driver
information center displays the SERVICE COLUMN
LOCK NOW message.
Belt-Driven Electric Power Steering System
The belt-driven electric power steering system consists
of the following components:
Drive Belt and Ball Nut Mechanism
The belt-driven electric power assist steering system
reduces the amount of effort needed to steer the
vehicle. The power steering control module and motor
attach to the base of the steering gear housing. The
motor applies power assist through the belt drive and a
ball nut mechanism. The ball nut mechanism translates
the rotational movement of the drive belt system to
lateral movement of the steering gear.
Overview
The 2021 Cadillac Escalade features electric
rack-and-pinion steering with a variable power assist
feature tuned to provide less assistance at highway
speeds and more assistance for less steering effort
when maneuvering at low speeds, for example in tight
spaces. A heated steering wheel is also available.
Steering System Features
Key features of the variable power assist steering
system include the following:
Energy-Absorbing Steering Column
The 2021 Cadillac Escalade uses an energy-absorbing
steering column. The energy-absorbing feature,
collapsible steering shaft, and breakaway mounting
features help reduce the chance of injury to the driver in
the event of an accident.
Steering Column Lock
The steering column lock module controls the steering
wheel theft deterrent lock function by locking the
column electronically. When a valid key is used to start
the vehicle, the Body Control Module (BCM) recognizes
this and sends an encrypted password to the steering
column lock module. The steering column lock module
then compares its own stored password to the
encrypted password sent by the BCM. If the data
matches, the steering column will be unlocked.
5619594
1. Drive Belt
2. Power Steering Motor
Drive Belt and Power Steering Motor
Power Steering Motor
The power steering motor is a permanent magnet motor
that is used to provide steering assist. The motor is
powered by a 12 V, three-phase Alternating Current
(AC). The electric power steering control module
controls the Pulse Width Modulated (PWM) motor drive
circuit to drive the three-phase motor.
Bulletin No.: 20-NA-211
October, 2020
Power Steering Control Module
The power steering control module uses input from the
torque sensor, motor rotational sensor, battery voltage
circuit, and high speed CAN 1 serial data circuit to
determine the level of motor assist needed. Vehicle
speed and engine speed from the high speed CAN 1
serial data circuit are also used to adjust the amount of
steering assist needed to steer the vehicle. At low
speeds, more assist is provided for easy turning during
parking maneuvers. At higher speeds, less assist is
provided for improved road feel and directional stability.
The power steering control module calculates the
power steering motor temperature based on time and
commanded current sent to the power steering motor.
The power steering control module may reduce the
amount of current commanded to the power steering
motor when the calculated temperature parameter is
exceeded. As the current is reduced, the amount of
steering assist provided is also reduced.
Torque Sensor
The torque sensor is attached to the steering gear
housing, near the input shaft of the rack and pinion
steering gear. It communicates the driver’s steering
intent to the electric power steering module. The
electric power steering module uses torque sensor
information to determine the level of assist provided by
the electric power steering motor. It attaches to the
power steering motor via the torque sensor wiring
harness connector.
Steering Gear
The power steering control module and motor are
attached to the base of the steering gear housing. The
power steering control module calculates the amount of
power assist supplied by the motor through the drive
belt and ball nut mechanism to the steering rack.
Page 63
Power Assist Electronic Steering System
Service Considerations
Any malfunction detected that disables steering assist
displays the SERVICE POWER STEERING message
on the driver information center. Additionally, the power
steering control module calculates an internal system
temperature, which is used to protect the power
steering system from damage caused by excessive
temperatures. When the calculated temperature
exceeds a pre-determined threshold, the current
command to the power steering motor reduces. The
result of the reduction in current is a temporary
reduction of power assist. Full assist returns once the
calculated temperature drops below the pre-determined
threshold. This normal condition does not require
repair.
The power steering assist motor and control module
are serviced as an assembly. See Service Information
(SI) for detailed instructions on replacement and use of
special tools for locking the column and for proper drive
belt tension.
Power Steering Control Module Calibrations
Centering of the steering angle sensor and software
endstop learning might be required after certain service
procedures are performed. Some of these procedures
are necessary after replacement of the steering gear,
steering column, power steering assist motor/module,
inner and/or outer tie rods.
Software Endstop Learning
The software endstops are learned automatically and
do not require any additional procedures.
PDI Special Instructions
Interior - “Transport Mode On" may display on the DIC
or the red battery light may flash. To turn the mode off,
start the engine, activate hazard flashers, press brake
pedal and turn the ignition key to the crank position for
15 seconds.
5619595
1.
2.
3.
4.
Steering Gear
Torque Sensor
Power Steering Motor
Power Steering Control Module
5627457
Page 64
October, 2020
Bulletin No.: 20-NA-211
Interior - To use the 110V A/C power outlet, at each
new ignition cycle, push the 100V A/C power button to
enable. The 110V power button (shown circled above)
is located to the left of the steering wheel.
Interior - Ensure the hands-free liftgate is set to “Open
and Close" under setting in the infotainment.
Exterior - Enable the function of the running boards to
deploy, through the Settings icon on the Home Page of
the infotainment display. (Vehicle, Running Boards,
Automatic Running Boards; - Deploy Running Boards).
Open any door and confirm the running board on that
side of the vehicle deploys.
Infotainment - If vehicle has RPO IOT (Navigation),
ensure that the Nav SD card that is located beneath the
USB hub in the armrest console is inserted correctly,
and is functional.
New Special Tools for 2021 Full-Size SUV’s (U.S. Launch)*
Tool Name
Tool Number
Availability
Divisions
Installer, Pinion
Seal and Side
Bearing
DT-52896
Shipped as Essential
Replacer,
Pinion
Bearing Cup
DT-52898
Available through LTP
(Loan Tool Program) only
Replacer, RDM
Mount Bushing
DT-52899
Available through LTP
(Loan Tool Program) only
Spreader, RDM
Rear Cover
DT-52900
Available through LTP
(Loan Tool Program) only
Bridge, RDM
Side
Bearing Cap
DT-52901
Available through LTP
(Loan Tool Program) only
Fixture, RDM
Rotating
DT-52902
Available through LTP
(Loan Tool Program) only
Remover, Axle
Flange and
Shaft
DT-52903
Shipped as Essential
Installer,
Pinion Seal
DT-52904
Available through LTP
(Loan Tool Program) only
(Luxury model)
Installer, RH
Output Seal
DT-52905
Available through LTP
(Loan Tool Program) only
(Luxury model)
Installer, LH
Output Seal
DT-52906
Available through LTP
(Loan Tool Program) only
(Luxury model)
* In Canada, these Special Tools will be Shipped as Essential.
Version Information
Version
1
Modified
Released October 19, 2020
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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TSB/Document ID: 20NA211
Replacement Service Bulletin Number:
MFR Communication Date: 2020-10-19
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Communication Type: Service Bulletin/Repair Instructions
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