2023 FORD SUPER DUTY differential

Four-Wheel Drive Precautions..............239
Four-Wheel Drive Limitations................239
Switching Four-Wheel Drive On and Off........................................................................240
Selecting a Four-Wheel Drive Mode.....241
Four-Wheel Drive Modes.........................242
Four-Wheel Drive Indicators...................242
Transfer Case Fluid Capacity andSpecification............................................242
Four-Wheel Drive – Troubleshooting........................................................................242
Electronic Locking Differential
What Is the Electronic LockingDifferential................................................245
How Does the Electronic LockingDifferential Work.....................................245
Electronic Locking DifferentialPrecautions...............................................245
Switching the Electronic LockingDifferential On and Off - 4x4.............245
Switching the Electronic LockingDifferential On and Off - 4x2..............247
Electronic Locking Differential Indicators........................................................................247
Electronic Locking Differential –Troubleshooting.....................................248
Brakes
Brake Precautions......................................249
Anti-Lock Braking System......................249
Brake Over Accelerator.............................249
Locating the Brake Fluid Reservoir......249
Checking the Brake Fluid.........................249
Brake Fluid Specification.........................250
Brakes – Troubleshooting.......................250
Electric Parking Brake
What Is the Electric Parking Brake.......253
Applying the Electric Parking Brake......253
Applying the Electric Parking Brake in anEmergency................................................253
Manually Releasing the Electric ParkingBrake............................................................253
Automatically Releasing the ElectricParking Brake...........................................254
Electric Parking Brake Audible Warning........................................................................254
Releasing the Electric Parking Brake ifthe Vehicle Battery Has Run Out ofCharge........................................................254
Electric Parking Brake – Troubleshooting........................................................................254
Diesel Engine Exhaust Brake
Diesel Engine Exhaust Brake –Precautions...............................................256
Using the Diesel Engine Exhaust Brake........................................................................256
Diesel Engine Exhaust Brake Indicators........................................................................257
Diesel Engine Exhaust Brake Gauge.....257
Diesel Engine Exhaust Brake –Troubleshooting......................................257
Diesel Engine Exhaust Brake Videos........................................................................257
Reverse Brake Assist
What Is Reverse Brake Assist.................258
How Does Reverse Brake Assist Work........................................................................258
Reverse Brake Assist Precautions........258
Switching Reverse Brake Assist On andOff................................................................259
Overriding Reverse Brake Assist...........259
Reverse Brake Assist Indicators............259
Reverse Brake Assist – Troubleshooting.......................................................................260
Cross Traffic Braking
What Is Cross Traffic Braking.................262
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2023 Super Duty (TFH) Canada/United States of America, enUSA, Edition date: 202211, DOMTable of Contents

Automatic Regen Control Off
See Diesel Particulate Filter(page 221).
Auto Hold Active
See Auto Hold Indicators(page 266).
Auto Hold Unavailable
See Auto Hold Indicators(page 266).
Blind Spot Monitor
See Blind Spot InformationSystem (page 327).
Cruise Control
See Cruise Control (page 294).
Distance Indication
See Distance IndicationIndicator (page 342).
Diesel Engine Brake
See Diesel Engine ExhaustBrake (page 256).
Electronic Locking Differential
See Electronic LockingDifferential (page 245).
Four-Wheel Drive
See Four-Wheel Drive (page238).
Note:Some indicators appear differentdepending on vehicle options.
Front Airbag
See Airbags (page 57).
Front Fog Lamp
See Using the Front FogLamps (page 120).
High Beam
See Using the High BeamHeadlamps (page 117).
Hill Descent
See Hill Descent Control (page277).
Lane Centering
See Lane Centering Indicators(page 306).
Lane Keeping System
See Lane Keeping SystemIndicators (page 320).
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2023 Super Duty (TFH) Canada/United States of America, enUSA, Edition date: 202211, DOMInstrument ClusterE362285 E323448 E323449 E323542 E332905 E381968 E171217 E234452 E325779 E181778 E181779 E181780 E67017 E67019 E163171 E297977 E382218

WHAT IS THE ELECTRONIC
LOCKING DIFFERENTIAL
The electronic locking differential is adevice housed in the rear axle and whenactivated, allows both wheels on that axleto turn at the same speed. The electroniclocking differential provides additionaltraction should your vehicle become stuck.
HOW DOES THE ELECTRONIC
LOCKING DIFFERENTIAL
WORK
You can activate the differentialelectronically and shift it on the fly withinthe operating speed range. The electronicdifferential disengages when the vehiclespeed exceeds a set value and it reengageswhen the vehicle speed drops below a setvalue. See Switching the ElectronicLocking Differential On and Off (page245). The electronic locking differentialcould engage based on certain selecteddrive modes. See Selecting a Drive Mode(page 311). The electronic lockingdifferential is for use in mud, rocks, sand,or any off-road condition where you needmaximum traction.
Note:The electronic locking differential isfor off-road use only and is not for use ondry pavement. Using the electronic lockingdifferential on dry pavement results inincreased tire wear, noise and vibration.
Note:The electronic locking differentialactivates or deactivates automaticallybased on speed, four-wheel drive mode, anddrive mode selection. See Switching theElectronic Locking Differential On andOff (page 245).
ELECTRONIC LOCKING
DIFFERENTIAL PRECAUTIONS
Operating the Electronic LockingDifferential with a Spare orMismatched Tires
On vehicles with an electronic lockingdifferential, the size of the spare tire canaffect performance of the system. If thereis a significant difference between the tworear tires, you may have limited electroniclocking differential functionality. If thesystem has difficulty disengaging, releasethe accelerator pedal and turn the steeringwheel in the opposite direction whenrolling. We recommend engaging anddisengaging the electronic lockingdifferential at a stop when you mount aspare on the rear axle.
SWITCHING THE ELECTRONIC
LOCKING DIFFERENTIAL ON
AND OFF - 4X4
Press the electronic lock differential switchto engage and disengage the lockingdifferential.
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2023 Super Duty (TFH) Canada/United States of America, enUSA, Edition date: 202211, DOMElectronic Locking Differential (If Equipped)E373433

4X4 Rear Electronic Locking Differential Engagement Speed and Availability
Automatic Re-Engagement SpeedAutomatic Disen-gagement SpeedMaximum Engage-ment SpeedDrive Modes
20 mph (30 km/h)25 mph (41 km/h)20 mph (30 km/h)Eco (2H, 4H)
20 mph (30 km/h)25 mph (41 km/h)20 mph (30 km/h)Tow/Haul Mode(2H,4H)
20 mph (30 km/h)25 mph (41 km/h)20 mph (30 km/h)Normal (2H, 4H)
20 mph (30 km/h)25 mph (41 km/h)20 mph (30 km/h)Slippery (2H, 4H)
No Speed LimitNo Speed LimitNo Speed LimitOff-Road (4H, 4L)1
No Speed LimitNo Speed LimitNo Speed LimitRock Crawl (4L)2
1 Engages when you select these drive modes. You have the ability to manually overridethe automatic engagement by pressing the electronic locking differential.2 Engages when you select these drive modes. You have the ability to manually overridethe automatic engagement by pressing the electronic locking differential. Only availablewith Tremor Package.
Automatic Re-Engagement SpeedAutomatic Disen-gagement SpeedMaximum Engage-ment Speed4WD Mode
No Speed LimitNo Speed LimitNo Speed LimitFour-Wheel DriveLow (4L)
Note:The electronic locking differentialmay not engage if you press the acceleratorpedal during an engagement attempt. Amessage could display in the instrumentcluster display guiding you to release theaccelerator pedal.
Note:Switching the electronic lockingdifferential off while turning results indisengagement difficulties. If the electroniclocking differential has difficultydisengaging, release the accelerator pedaland turn the steering wheel back and forthin small increments while maintainingcontrol and following a straight line.
Note:The electronic locking differential isfor off-road use only and is not for use ondry pavement. Using the electronic lockingdifferential on dry pavement results inincreased tire wear, noise and vibration.
Note:Do not perform this operation whencruise control or trail control is selected andactive. The system may not engage ordisengage as expected.
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2023 Super Duty (TFH) Canada/United States of America, enUSA, Edition date: 202211, DOMElectronic Locking Differential (If Equipped)

SWITCHING THE ELECTRONIC
LOCKING DIFFERENTIAL ON
AND OFF - 4X2
Press the electronic locking differentialswitch to engage and disengage theelectronic locking differential.
4X2 Rear Electronic LockingDifferential Engagement Speed andAvailability
AutomaticRe-Engage-ment Speed
AutomaticDisengage-ment Speed
MaximumEngagementSpeed
20 mph(30 km/h)25 mph(41 km/h)20 mph(30 km/h)
Note:The electronic locking differential canactivate or deactivate automatically basedon speed, four-wheel drive mode, and drivemode selection. See Selecting a DriveMode (page 311).
Note:The electronic locking differentialmay not engage if you press the acceleratorpedal during an engagement attempt. Amessage could display in the instrumentcluster display guiding you to release theaccelerator pedal.
Note:Switching the electronic lockingdifferential off while turning results indisengagement difficulties. If the electroniclocking differential has difficultydisengaging, release the accelerator pedaland turn the steering wheel back and forthin small increments while maintainingcontrol and following a straight line.
Note:The electronic locking differential isfor off-road use only and is not for use ondry pavement. Using the electronic lockingdifferential on dry pavement results inincreased tire wear, noise and vibration.
Note: Do not perform this operation whencruise control or trail control is selected andactive. The system may not engage ordisengage as expected.
ELECTRONIC LOCKING
DIFFERENTIAL INDICATORS
If both rear wheel axle shaftslock together, the indicator in thecluster is amber, providingadditional traction.
If you select the electronic lockingdifferential and the indicator in the clusteris gray or turns from amber to gray whiledriving, one of the following has occurred:
•The vehicle speed is too high.
•The accelerator pedal is too high duringan engagement attempt.
•The vehicle is experiencing an anti-lockbrake activation.
•The left and right wheel speeddifference is too high during anengagement attempt.
If you select the electronic lockingdifferential and the indicator in the clusterdoes not turn on, the following hasoccurred:
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2023 Super Duty (TFH) Canada/United States of America, enUSA, Edition date: 202211, DOMElectronic Locking Differential (If Equipped)E373432 E325779

•The system has malfunctioned andaccompanies a check lockingdifferential message in the informationdisplay. See your dealer as soon aspossible.
Note:If the vehicle is experiencing ananti-lock braking event, the electroniclocking differential may momentarilydisengage.
ELECTRONIC LOCKING DIFFERENTIAL – TROUBLESHOOTING
ELECTRONIC LOCKING DIFFERENTIAL – INFORMATION MESSAGES
Description and ActionMessage
An electronic locking differential system fault is present.Contact an authorized dealer as soon as possible.Check Locking Differen-tial
Release the accelerator pedal to engage.To Engage LockingDifferential ReleaseAccelerator Pedal
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2023 Super Duty (TFH) Canada/United States of America, enUSA, Edition date: 202211, DOMElectronic Locking Differential (If Equipped)

WHAT IS TRAIL TURN ASSIST
Trail turn assist can reduce the turningradius of your vehicle by applying thebrakes to the inside rear wheel inlow-speed, high steering-angle maneuvers.
TRAIL TURN ASSIST
PRECAUTIONS
Note:Do not use trail turn assist on dry,hard surfaced roads. Doing so can produceexcessive noise, increase tire wear and maydamage drive line, or braking components.Trail turn assist is only intended for slippery,or loose surfaces.
You may hear noise from the anti-lockbrake system while trail turn assist isactive. This is normal operation.
TRAIL TURN ASSIST
LIMITATIONS
Trail turn assist can only be used when thevehicle’s four-wheel drive system is in thefour-wheel drive high (4H), or four-wheeldrive low (4L) modes.
Trail Turn Assist cannot be used when thevehicle’s rear differential is locked. If therear differential has recently been lockedprior to Trail Turn Assist being turned on,Trail Turn Assist may not activate until itcan confirm that the rear differential isunlocked.
SWITCHING TRAIL TURN
ASSIST ON AND OFF
While your vehicle is in four-wheel drivehigh (4H) or four-wheel drive low (4L),press the trail turn assist button to switchthe feature on. Trail turn assist is on at thistime but does not activate until the:
•Vehicle speed is less than 12 mph(19.3 km/h).
•Rear differential is fully unlocked.
•Steering wheel is almost fully turnedto the left or right.
Switch trail turn assist off by performingany of the following:
•Press the trail turn assist button again.
•Select two-wheel drive high (2H), orfour-wheel drive auto (4A).
•Switch on the rear locking differential.
TRAIL TURN ASSIST
INDICATORS
When trail turn assist is on, oneof these two indicators will bedisplayed, depending on thedirection of the vehicle’s lastturn. When the feature isavailable but not in use, theindicator will be gray. When the feature isactive the indicator will be green.
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2023 Super Duty (TFH) Canada/United States of America, enUSA, Edition date: 202211, DOMTrail Turn Assist (If Equipped)E338899 E338900

TRAIL TURN ASSIST –
TROUBLESHOOTING
TRAIL TURN ASSIST –INFORMATION MESSAGES
DetailsMessage
Switch to four-wheeldrive low (4L) or four-wheel drive high (4H) toactivate trail turn assist.See Selecting a Four-Wheel Drive Mode(page 241).
Trail TurnAssist Avail-able in 4L or4H
Trail turn assist systemmalfunction could bepresent. If this conditionpersists, have yourvehicle serviced.
Trail TurnAssist NotAvailable SeeManual
You have activated trailturn assist.Trail TurnAssist ON
You have switched trailturn assist off.Trail TurnAssist OFF
TRAIL TURN ASSIST –FREQUENTLY ASKED QUESTIONS
Why does Trail Turn Assist not activateafter unlocking the rear differential?
The rear differential may not be fullydisengaged. When possible, turn offthe rear axle locker while drivingstraight before using trail turn assist.If you are already in a tight turn whenyou encounter this situation, drivingthe vehicle for a short distance inreverse could allow the differential tofully disengage.
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2023 Super Duty (TFH) Canada/United States of America, enUSA, Edition date: 202211, DOMTrail Turn Assist (If Equipped)