2021 FORD F-150 Owners Manual

WHAT IS THE ELECTRONIC
LOCKING DIFFERENTIAL
The electronic locking differential is a
device housed in the rear axle, and can
provide additional traction when needed.
HOW DOES THE ELECTRONIC
LOCKING DIFFERENTIAL
WORK - RAPTOR
You can activate the differential
electronically and shift it on the fly within
the operating speed range. The electronic
differential disengages when the vehicle
speed exceeds a set value and it reengages
when the vehicle speed goes below a set
value depending on drive mode. See
Switching the Electronic Locking
Differential On and Off (page 303). The
electronic locking differential is for use in
mud, rocks, sand, or any off-road condition
where you need maximum traction.
Note:
The electronic locking differential can
activate or deactivate automatically based
on speed, four-wheel drive mode, and drive
mode selection. See Switching the
Electronic Locking Differential On and
Off
(page 303).
Note: The electronic locking differential is
for off-road use only and is not for use on
dry pavement. Using the electronic locking
differential on dry pavement results in
increased tire wear, noise and vibration.
Note: The electronic locking differential is
not available in 2H. HOW DOES THE ELECTRONIC
LOCKING DIFFERENTIAL
WORK
You can activate the differential
electronically and shift it on the fly within
the operating speed range. The electronic
differential disengages when the vehicle
speed exceeds a set value, and reengages
when the vehicle speed goes below a set
value. See
Switching the Electronic
Locking Differential On and Off (page
303). It also engages based on certain
selected drive modes. See Selecting a
Drive Mode (page 373). The electronic
locking differential is for use in mud, rocks,
sand, or any off-road condition where you
need maximum traction.
Note: The electronic locking differential can
activate or deactivate automatically based
on speed, four-wheel drive mode, and drive
mode selection.
See Switching the
Electronic Locking Differential On and
Off
(page 303).
Note: The electronic locking differential is
for off-road use only and is not for use on
dry pavement. Using the electronic locking
differential on dry pavement results in
increased tire wear, noise and vibration.
ELECTRONIC LOCKING
DIFFERENTIAL PRECAUTIONS
Operating the Electronic Locking
Differential with a Spare or
Mismatched Tires
On vehicles with an electronic locking
differential, the size of the spare tire can
affect performance of the system. If there
is a significant difference between the two
rear tires, you may have limited electronic
locking differential functionality. If the
system has difficulty disengaging, release
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(If Equipped)

the accelerator pedal and turn the steering
wheel in the opposite direction when
rolling. We recommend engaging and
disengaging the electronic locking
differential at a stop when you mount a
spare on the rear axle.
SWITCHING THE ELECTRONIC
LOCKING DIFFERENTIAL ON
AND OFF - RAPTOR
The button to activate and deactivate the
electronic locking differential is in the
center of the drive mode rotary switch.
To manually activate or deactivate the
electronic locking differential, press the
electronic locking differential button.
Note:
The electronic locking differential can
activate or deactivate automatically based
on speed, four-wheel drive mode, and drive
mode selection. See Selecting a Drive
Mode (page 373).
Rear Electronic Locking Differential Engagement Speed and Availability Automatic Re-
Engagement Speed
Automatic Disen-
gagement Speed
Maximum Engage-
ment Speed
Drive Modes
20 mph (30 km/h)
25 mph (41 km/h)
20 mph (30 km/h)
Normal (4A, 4H)
20 mph (30 km/h)
25 mph (41 km/h)
20 mph (30 km/h)
Sport (4A, 4H)
20 mph (30 km/h)
25 mph (41 km/h)
20 mph (30 km/h)
Slippery (4A, 4H)
20 mph (30 km/h)
25 mph (41 km/h)
20 mph (30 km/h)
Tow/Haul (4A,4H)
No Speed Limit
No Speed Limit
No Speed Limit
Off-Road (4H) 1
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(If Equipped)E308146

Automatic Re-
Engagement Speed
Automatic Disen-
gagement Speed
Maximum Engage-
ment Speed
Drive Modes
No Speed Limit
No Speed Limit
No Speed Limit
Baja (4H)
No Speed Limit
No Speed Limit
No Speed Limit
Rock Crawl (4L) 1
1 Automatically engages when you select this drive mode. You have the ability to manually
override the automatic engagement by pressing the electronic locking differential button. Automatic Re-
Engagement Speed
Automatic Disen-
gagement Speed
Maximum Engage-
ment Speed
4WD Mode
No speed Limit
No speed Limit
No speed Limit
Four-Wheel Drive
Low (4L)
Note: The electronic locking differential
may not engage if you press your accelerator
pedal during an engagement attempt. A
message could display in the instrument
display guiding you to release the
accelerator pedal.
Note: If the electronic locking differential
has difficulty disengaging, release the
accelerator pedal and turn the steering
wheel in the opposite direction while rolling.
Note: The electronic locking differential is
for off-road use only and is not for use on
dry pavement. Using the electronic locking
differential on dry pavement results in
increased tire wear, noise and vibration.
SWITCHING THE ELECTRONIC
LOCKING DIFFERENTIAL ON
AND OFF - 4X4
The button to activate and deactivate the
electronic locking differential is in the
center of the drive mode rotary switch. 303
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To manually activate or deactivate the
electronic locking differential, press the
electronic locking differential button.
Note:
The electronic locking differential can
activate or deactivate automatically based
on speed, four-wheel drive mode, and drive
mode selection. See Selecting a Drive
Mode (page 373).
4X4 Rear Electronic Locking Differential Engagement Speed and Availability Automatic Re-
Engagement Speed
Automatic Disen-
gagement Speed
Maximum Engage-
ment Speed
Drive Modes
20 mph (30 km/h)
25 mph (41 km/h)
20 mph (30 km/h)
Normal (2H, 4A 2
, 4H)
20 mph (30 km/h)
25 mph (41 km/h)
20 mph (30 km/h)
Eco (2H, 4A 2
, 4H)
20 mph (30 km/h)
25 mph (41 km/h)
20 mph (30 km/h)
Sport (2H, 4A 2
, 4H)
20 mph (30 km/h)
25 mph (41 km/h)
20 mph (30 km/h)
Slippery (2H, 4A 2
,
4H)
No Speed Limit
No Speed Limit
No Speed Limit
Deep Snow/Sand
(4H, 4L) 1
No Speed Limit
No Speed Limit
No Speed Limit
Mud/Ruts (4H, 4L) 1
No Speed Limit
No Speed Limit
No Speed Limit
Rock Crawl (4L) 1
20 mph (30 km/h)
25 mph (41 km/h)
No Speed Limit
Tow/Haul Mode
1 Automatically engages when you select these drive modes. You have the ability to
manually override the automatic engagement by pressing the electronic locking differential
button.
2 If available for 4A drive modes.
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(If Equipped)E308146

Automatic Re-
Engagement Speed
Automatic Disen-
gagement Speed
Maximum Engage-
ment Speed
4WD Mode
No speed Limit
No speed Limit
No speed Limit
Four-Wheel Drive
Low (4L)
Note: The electronic locking differential
may not engage if you press your accelerator
pedal during an engagement attempt. A
message could display in the instrument
display guiding you to release the
accelerator pedal.
Note: If the electronic locking differential
has difficulty disengaging, release the
accelerator pedal and turn the steering
wheel in the opposite direction while rolling.
Note: The electronic locking differential is
for off-road use only and is not for use on
dry pavement. Using the electronic locking
differential on dry pavement results in
increased tire wear, noise and vibration.
SWITCHING THE ELECTRONIC
LOCKING DIFFERENTIAL ON
AND OFF - 4X2
The button to activate and deactivate the
electronic locking differential is located in
the center of the Drive mode rotary switch. To manually activate or deactivate the
electronic locking differential, press the
electronic locking differential button.
4X2 Rear Electronic Locking Differential Engagement Speed and Availability Automatic Re-Engagement
Speed
Automatic Disengagement
Speed
Maximum Engagement
Speed
20 mph (30 km/h)
25 mph (41 km/h)
20 mph (30 km/h)
Note: The electronic locking differential
may not engage if you press your accelerator
pedal during an engagement attempt. A
message could display in the instrument
display guiding you to release the
accelerator pedal. Note:
If the electronic locking differential
has difficulty disengaging, release the
accelerator pedal and turn the steering
wheel in the opposite direction while rolling.
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Note:
The electronic locking differential is
for off-road use only and is not for use on
dry pavement. Using the electronic locking
differential on dry pavement results in
increased tire wear, noise and vibration.
ELECTRONIC LOCKING
DIFFERENTIAL INDICATORS If both rear wheel axle shafts
lock together, the indicator in the
cluster is amber, providing
additional traction.
If you select the electronic locking
differential and the indicator in the cluster
is gray or turns from amber to gray while
driving, one of the following has occurred:
• The vehicle speed is too high.
• The accelerator pedal is too high during
an engagement attempt. •
The vehicle is experiencing an anti-lock
brake activation.
• The left and right wheel speed
difference is too high during an
engagement attempt.
If you select the electronic locking
differential and the indicator in the cluster
does not turn on, the following has
occurred:
• The system has malfunctioned and
accompanies a check locking
differential message in the information
display. See your dealer as soon as
possible.
Note: If the vehicle is experiencing an
anti-lock braking event, the electronic
locking differential could momentarily
disengage.
ELECTRONIC LOCKING DIFFERENTIAL – TROUBLESHOOTING
ELECTRONIC LOCKING DIFFERENTIAL – INFORMATION MESSAGES -
RAPTOR Description and Action
Message
The electronic locking differential has been requested andwill engage when the speed condition is met.
To Engage Locking
Differential Slow to XX mph/km/h
Release the accelerator pedal in order to engage.
To Engage Locking
Differential Release Accelerator Pedal
An electronic locking differential system fault is present.Contact an authorized dealer as soon as possible.
Check Locking Differen-
tial
Displays when the electronic locking differential is selected while in 2H.
Locking differential not
available in 2H
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ELECTRONIC LOCKING DIFFERENTIAL – INFORMATION MESSAGES
Description and Action
Message
The electronic locking differential has been requested andwill engage when the speed condition is met.
To Engage Locking
Differential Slow to XX mph/km/h
Release the accelerator pedal in order to engage.
To Engage Locking
Differential Release Accelerator Pedal
An electronic locking differential system fault is present.Contact an authorized dealer as soon as possible.
Check Locking Differen-
tial
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BRAKE PRECAUTIONS
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.
Wet brakes result in reduced braking
efficiency. Gently press the brake pedal a
few times when leaving a car wash or
driving from standing water to dry the
brakes.
Note: Depending on applicable laws and
regulations in the country for which your
vehicle was originally built, the stoplamps
could flash during heavy braking. Following
this the hazard warning flashers could also
turn on when your vehicle comes to a stop.
ANTI-LOCK BRAKING SYSTEM
ANTI-LOCK BRAKING SYSTEM
LIMITATIONS
The anti-lock braking system does not
eliminate the risk of crash when:
• You drive too closely to the vehicle in
front of you.
• Your vehicle is hydroplaning.
• You take corners too fast.
• The road surface is poor.
Note: If the system activates, the brake
pedal could pulse and travel further.
Maintain pressure on the brake pedal. BRAKE OVER ACCELERATOR
- RAPTOR
In the event the accelerator pedal
becomes stuck or entrapped, apply steady
and firm pressure to the brake pedal to
slow the vehicle and reduce engine power.
If you experience this condition, apply the
brakes and bring your vehicle to a safe
stop. Move the transmission to park (P),
switch the engine off and apply the parking
brake. Inspect the accelerator pedal for
any interference. If none are found and the
condition persists, have your vehicle towed
to the nearest authorized dealer.
Note:
Certain drive modes can disable
brake over accelerator for off-road driving.
BRAKE OVER ACCELERATOR
In the event the accelerator pedal
becomes stuck or entrapped, apply steady
and firm pressure to the brake pedal to
slow the vehicle and reduce engine power.
If you experience this condition, apply the
brakes and bring your vehicle to a safe
stop. Move the transmission to park (P),
switch the engine off and apply the parking
brake. Inspect the accelerator pedal for
any interference. If none are found and the
condition persists, have your vehicle towed
to the nearest authorized dealer.
LOCATING THE BRAKE FLUID
RESERVOIR
See
Under Hood Overview (page 504).
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