2021 FORD F-350 four wheel drive

Rear Occupant Alert System Audible
Warnings .....................................................163
Garage Door Opener
Universal Garage Door Opener ..............
164
Auxiliary Power Points
Auxiliary Power Points ...............................
168
Wireless Accessory Charger ....................
169
Storage Compartments
Center Console ...............................................
171
Overhead Console ........................................
171
Under Seat Storage ......................................
171
Starting and Stopping the Engine
General Information ...................................
174
Ignition Switch ..............................................
174
Keyless Starting ............................................
175
Starting a Gasoline Engine - 6.2L/7.3L ........................................................................\
.
175
Starting a Diesel Engine - 6.7L Diesel ........................................................................\
..
177
Switching Off the Engine - 6.7L Diesel ........................................................................\
.
182
Engine Idle Shutdown ................................
182
Engine Block Heater ...................................
182
Fuel and Refueling
Safety Precautions .....................................
184
Fuel Quality - E85 .......................................
185
Fuel Quality - Gasoline .............................
186
Fuel Quality - Diesel ...................................
187
Running Out of Fuel ...................................
189
Refueling - Gasoline ...................................
189
Refueling - Diesel ........................................
190
Fuel Consumption .......................................
193Engine Emission Control
Emission Law
................................................
194
Catalytic Converter .....................................
195
Selective Catalytic Reductant System - Diesel ............................................................
197
Diesel Particulate Filter ............................
202
Transmission
Automatic Transmission ..........................
207
Power Take-Off ............................................
212
Four-Wheel Drive
Using Four-Wheel Drive ............................
213
Rear Axle
Limited Slip Differential .............................
221
Electronic Locking Differential ................
221
Brakes
General Information ...................................
223
Hints on Driving With Anti-Lock Brakes ........................................................................\
225
Parking Brake ................................................
225
Hill Start Assist ............................................
225
Traction Control
Principle of Operation ................................
227
Using Traction Control ...............................
227
Stability Control
Principle of Operation ...............................
228
Using Stability Control ..............................
229
Trail Control
What Is Trail Control ...................................
231
Switching Trail Control On and Off .......
231
Setting the Trail Control Speed ..............
231
Canceling the Set Speed ..........................
231
Trail Control Indicators ...............................
231
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Super Duty (TFE) Canada/United States of America, enUSA, Edition date: 202008, Third-Printing- Table of Contents

Terrain Control
Principle of Operation
...............................232
Using Hill Descent Control ......................
232
Parking Aids
Principle of Operation ...............................
234
Rear Parking Aid ..........................................
234
Rear View Camera ......................................
235
360 Degree Camera ..................................
238
Cruise Control
What Is Cruise Control ..............................
242
Switching Cruise Control On and Off ........................................................................\
242
Setting the Cruise Control Speed .........
242
Canceling the Set Speed .........................
243
Resuming the Set Speed .........................
243
Cruise Control Indicators .........................
243
Using Adaptive Cruise Control ...............
243
Driving Aids
Driver Alert ....................................................
250
Lane Keeping System ................................
251
Blind Spot Information System ............
254
Cross Traffic Alert .......................................
259
Steering ..........................................................
262
Pre-Collision Assist ....................................
264
Drive Control ................................................
268
Load Carrying
Load Carrying Precautions .......................
271
Locating the Safety Compliance Certification Labels ................................
272
What Is the Gross Axle Weight Rating ........................................................................\
.
272
What Is the Gross Vehicle Weight Rating ........................................................................\
.
272
What Is the Maximum Loaded Trailer Weight .........................................................
272
What Is the Gross Combined Weight Rating ..........................................................
273 Calculating Payload
...................................
274
Calculating the Load Limit ......................
274
Pickup Bed
Pickup Bed Anchor Points ........................
277
Pickup Bed Ramps .....................................
279
Towing
Towing a Trailer ...........................................
282
Trailer Reversing Aids ................................
283
Trailer Sway Control ..................................
300
Recommended Towing Weights ..........
300
Essential Towing Checks .........................
305
Towing the Vehicle on Four Wheels ......
314
Driving Hints
Economical Driving ......................................
317
Off-Road Driving ..........................................
317
Breaking-In ....................................................
320
Driving Through Water ..............................
320
Snow Plowing ...............................................
321
Floor Mats ......................................................
323
Roadside Emergencies
Roadside Assistance .................................
325
Hazard Flashers ..........................................
326
Fuel Shutoff ..................................................
326
Jump Starting the Vehicle ........................
327
Post-Crash Alert System .........................
329
Transporting the Vehicle ..........................
329
Towing Points ..............................................
330
Customer Assistance
Getting the Services You Need ..............
332
In California (U.S. Only) ............................
333
The Better Business Bureau (BBB) Auto Line Program (U.S. Only) ....................
334
Utilizing the Mediation/Arbitration Program (Canada Only) ......................
335
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Super Duty (TFE) Canada/United States of America, enUSA, Edition date: 202008, Third-Printing- Table of Contents

Battery
If it illuminates while driving, it
indicates a malfunction. Switch
off all unnecessary electrical
equipment and have the system checked
immediately.
Brake System Warning Lamp WARNING: Driving your vehicle
with the warning lamp on is dangerous.
A significant decrease in braking
performance may occur. It may take you
longer to stop your vehicle. Have your
vehicle checked as soon as possible.
Driving extended distances with the
parking brake engaged can cause brake
failure and the risk of personal injury.
This lamp is a dual function lamp and
illuminates when:
• You apply the parking brake with the
ignition on.
• Your vehicle has a brake fault or low
brake fluid level, regardless of parking
brake position. If the lamp illuminates while you
are moving, you may have the
parking brake applied. Be sure
that the parking brake is off.
Have your vehicle checked as
soon as possible if the lamp
continues to illuminate.
Note: Indicators vary depending on region.
Blind Spot Monitor
(If Equipped) Illuminates when you switch this
feature off or in conjunction with
a message. See
Blind Spot
Information System (page 254). Check Fuel Cap
(If Equipped) Illuminates when the fuel cap
may not be properly installed.
Continued driving with this light
on may cause the service engine soon
warning indicator to come on.
Check 4X4
(If Equipped) Illuminates with a message
when a four-wheel drive fault is
present. See Using Four-Wheel
Drive
(page 213).
Cruise Control
(If Equipped) Illuminates when you switch this
feature on. See
Switching
Cruise Control On and Off
(page
242).
Diesel Engine Brake
(If Equipped) Illuminates when you switch the
manual engine brake on. See
General Information
(page
223). Illuminates when you switch the
automatic engine brake on. See
General Information
(page
223).
Diesel Exhaust Fluid
(If Equipped) With the key in the on position,
illuminates when the DEF is
contaminated, low or someone
has tampered with the DEF system. See
Selective Catalytic Reductant System
(page
197).
106
Super Duty (TFE) Canada/United States of America, enUSA, Edition date: 202008, Third-Printing- Instrument Cluster E270480 E151262 E71340 E171217 E234452 E163176

During refueling, it is possible for
you to pump
water-contaminated diesel fuel
into your fuel tank. Your vehicle ’s fuel
system is equipped with a fuel filter and
water separator to remove water from the
fuel. The water in fuel indicator illuminates
when the fuel and water separator has a
significant quantity of water in it and
requires immediate draining.
If the water in fuel indicator illuminates
when the engine is running, stop your
vehicle as soon as safely possible, shut off
the engine, then drain the fuel and water
separator. See Fuel Quality (page 187).
Allowing water to stay in the fuel system,
after the water in fuel indicator illuminates,
could result in extensive damage or failure
of the fuel injection system.
Note: Do not drain the fuel and water
separator while the engine is running. Air will
enter into the fuel system causing the engine
not to operate properly.
Four-Wheel Drive Indicators
(If
Equipped)
4X2 HIGH Illuminates momentarily when
two-wheel drive high is engaged.
4X4 HIGH Illuminates when four-wheel
drive high is engaged.
4X4 LOW Illuminates when four-wheel
drive low is engaged. AUDIBLE WARNINGS AND
INDICATORS
Key in Ignition Warning Chime
Sounds when you open the driver's door
and you have left the key in the ignition.
Keyless Warning Alert
(If Equipped)
Sounds the horn twice when you exit your
vehicle with the intelligent access key, after
the last door is closed and your keyless
vehicle is in RUN, indicating your vehicle is
still on.
Headlamps On Warning Chime
Sounds when you remove the key from the
ignition and open the driver's door and you
have left the headlamps or parking lamps
on.
Parking Brake On Warning Chime
Sounds when you have left the parking
brake on and drive your vehicle. If the
warning chime remains on after you have
released the parking brake, have the
system checked by an authorized dealer
immediately.
109
Super Duty (TFE) Canada/United States of America, enUSA, Edition date: 202008, Third-Printing- Instrument Cluster E181778 E181779 E181780

Driver Alert
Action
Message
Stop and rest as soon as it is safe to do so.
Driver Alert Warning Rest
Now
Take a rest soon.
Driver Alert Warning Rest
Suggested
Drivetrain Action
Message
The electronic locking differential requests that you slow toa certain speed to engage.
To Engage Locking
Differential Slow to XX mph/km/h
The electronic locking differential requests that you releasethe accelerator in order to engage.
To Engage Locking
Differential Release Accelerator Pedal
An electronic locking differential (ELD) system fault is
present. Contact an authorized dealer as soon as possible.
Check Locking Differen-
tial
The transfer case is in the neutral position. This message
indicates that your vehicle is safe to tow with all four wheels on the ground.
Neutral Tow Enabled
Leave Transmission in Neutral
The transfer case is NOT in the neutral position. This messageindicates that your vehicle is NOT safe to be towed with all four wheels on the ground.
Neutral Tow Disabled
Engine Action
Message
The engine has reduced power to help reduce highengine temperature.
Power Reduced to Lower Engine
Temp
129
Super Duty (TFE) Canada/United States of America, enUSA, Edition date: 202008, Third-Printing- Information Displays

Action
Message
Displays when you command a 4x4 shift during
conditions which are potentially harmful to the drive- line components.
To Engage 4x4 Slow to 3 MPH
To Engage 4x4 Slow to 5 km/h
Displays when the 4x4 system requests you releasethe accelerator pedal to complete a 4x4 shift. See Using Four-Wheel Drive (page 213).
To Engage 4x4 Release Acceler-
ator Pedal
Displays when you command a drive mode change toDeep Snow/Sand and the vehicle is in 2H.
For Improved Performance 4x4
Recommended
Displays when you attempt to switch out of 4x4 LOWand Rock Crawl mode is engaged.
To Exit 4x4 LOW Exit Rock
Crawl Mode
Displays when you attempt to select Rock Crawl modeand 4x4 LOW is not engaged.
To Enter Rock Crawl Mode 4x4
LOW is Required
139
Super Duty (TFE) Canada/United States of America, enUSA, Edition date: 202008, Third-Printing- Information Displays

USING FOUR-WHEEL DRIVE
Note:
For important information regarding
the safe operation of this type of vehicle,
see General Information in the Wheels and
Tires chapter.
Note: Do not use 4H or 4L mode on dry,
hard surfaced roads. Doing so can produce
excessive noise, increase tire wear and may
damage drive components. 4X4 mode is
only intended for consistently slippery or
loose surfaces. Use of 4L mode on these
surfaces may produce some noise, such as
occasional clunks, but will not damage drive
components.
Note: If 4X4 low is selected while the
vehicle is moving above 3 mph (5 km/h),
the 4WD system will not perform a shift.
This is normal and should be no reason for
concern. Refer to Shifting to or from 4L (4X4
Low) for proper operation.
Note: You can switch on and switch off the
electronic locking differential by pulling the
4WD control (4WD vehicles) or turning the
electronic locking differential control (2WD
vehicles). See
Electronic Locking
Differential (page 221).
Electronic Shift-On-the-Fly
(ESOF) 4WD system
(If Equipped)
Note: If 4X4 Low is selected while the
vehicle is moving above
3 mph (5 km/h),
the 4WD system will not perform a shift.
This is normal and should be no reason for
concern. Refer to Shifting to or from 4L (4X4
Low) for proper system operation.
Note: Auto-manual hub locks can be
manually locked by rotating the hub lock
control from AUTO to LOCK. For proper operation, make sure that each
hub is fully engaged and that both hub
locks are set to the same position (both
set to LOCK or both set to AUTO). To
engage LOCK, turn the hub locks
completely clockwise; to engage AUTO,
turn the hub locks completely
counterclockwise.
The ESOF 4WD system:
•
Provides 4x4 High engagement and
disengagement while the vehicle is
moving.
• Is operated by a rotary control located
on the instrument panel that allows
you select 4x2, 4x4 High or 4x4 Low
operation.
• Uses auto-manual hub locks that can
be engaged and disengaged
automatically based on the 4x4 mode
selected.
• Will increase fuel economy when used
in the hub lock's recommended AUTO
mode.
4WD Indicator Lights
Note: When a 4X4 system fault is present,
the system will typically remain in whichever
4X4 mode was selected prior to the fault
condition occurring. It will not default to 4X2
in all circumstances. When this warning is
displayed, have your vehicle serviced by an
authorized dealer.
213
Super Duty (TFE) Canada/United States of America, enUSA, Edition date: 202008, Third-Printing- Four-Wheel Drive
(If Equipped)LOC K
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4X2
Momentarily illuminates when
2H is selected.
4X4 HIGH Continuously illuminates when
4H is selected.
4X4 LOW Continuously illuminates when
4L is selected.
CHECK 4X4 Displays when a 4X4 fault is
present.
Using the Electronic Shift on the
Fly 4WD system (If Equipped) 2H (4X2)
For general on-road driving. Sends power
to the rear wheels only and should be used
for street and highway driving. Provides
optimal smoothness and fuel economy at
high speeds. 4H (4X4 HIGH)
Provides mechanically locked four-wheel
drive power to both the front and rear
wheels for use in off-road or winter
conditions such as deep snow, sand or
mud. This mode is not for use on dry
pavement.
4L (4X4 LOW)
Provides mechanically locked four-wheel
drive power to both the front and rear
wheels for use on low traction surfaces,
but does so with additional gearing for
increased torque multiplication. Intended
only for off-road applications such as deep
sand, steep grades, or pulling heavy
objects. 4L (4X4 low) will not engage while
your vehicle is moving above
3 mph
(5 km/h); this is normal and should be no
reason for concern. Refer to Shifting to or
from 4L (4X4 low) for proper operation.
Shifting Between System Modes
Note: Momentarily releasing the accelerator
pedal when a shift in progress message
displays improves engagement or
disengagement performance.
Note: Do not perform this operation if the
rear wheels are slipping or when applying
the accelerator pedal.
Note: Some noise may be heard as the
system shifts or engages; this is normal.
Note: 4X4 high mode is not intended for
use on dry pavement.
You can move the control from 2H or 4H
at a stop or while driving. The information
display may display a message indicating
a 4X4 shift is in progress. Once the shift is
complete the message center will then
display the system mode selected.
Shifting to or from 4L (4X4 low)
Note: Some noise may be heard as the
system shifts or engages; this is normal.
214
Super Duty (TFE) Canada/United States of America, enUSA, Edition date: 202008, Third-Printing- Four-Wheel Drive
(If Equipped)E181778 E181779 E181780 E191851