2023 FORD SUPER DUTY ECO mode

WHAT IS THE SELECTIVE
CATALYTIC REDUCTION
SYSTEM
The selective catalytic reduction systemhelps reduce tailpipe emissions andrequires Diesel Exhaust Fluid (DEF) toconvert nitrogen oxides into nitrogen andwater.
HOW DOES THE SELECTIVE
CATALYTIC REDUCTION
SYSTEM WORK
The selective catalytic reduction systeminjects diesel exhaust fluid into the exhaustsystem to enable correct selective catalyticreduction system function.
The usage of diesel exhaust fluid hasincreased from prior model years in orderto meet more stringent emissionsrequirements. The diesel exhaust fluidusage ranges from approximately 2-6%of fuel burned (100.00 gal (378.54 L) offuel requires approximately 2.00 gal(7.57 L)to 6.00 gal (22.71 L) of dieselexhaust fluid) depending on vehicle usage.Factors that influence diesel exhaust fluidusage may include:
•Payload/Towing
•Driving Style
•Altitude
•Humidity
•Temperature
SELECTIVE CATALYTIC
REDUCTION SYSTEM
PRECAUTIONS
WARNING: Keep diesel exhaustfluid out of reach of children. Avoidcontact with skin, eyes or clothing. Incase of contact with your eyes, flushimmediately with water and get promptmedical attention. In case of contactwith your skin, clean immediately withsoap and water. If you swallow anydiesel exhaust fluid, drink plenty ofwater, call a physician immediately.
WARNING: Only refill the dieselexhaust fluid tank in a well ventilatedarea. When you remove the dieselexhaust fluid tank filler cap or a dieselexhaust fluid container cap, ammoniavapors may escape. Ammonia vaporscan be irritating to skin, eyes and mucousmembranes. Inhaling ammonia vaporscan cause burning to the eyes, throat andnose and cause coughing and wateryeyes.
WARNING: Diesel exhaust fluidmust be refilled when low or replacedwhen contaminated or your vehiclespeed becomes limited to 50 mph(80 km/h). In these conditions, drive withcaution and refill diesel exhaust fluidimmediately. If the diesel exhaust fluidbecomes empty or contaminated andfluid is not replaced, your vehiclebecomes limited to engine idle only oncestopped. In these conditions, be cautiouswhere you stop your vehicle because youmay not be able to drive long distancesor maintain highway speeds until yourefill or replace the diesel exhaust fluid.
226
2023 Super Duty (TFH) Canada/United States of America, enUSA, Edition date: 202211, DOMSelective Catalytic Reduction System (If Equipped)

SELECTIVE CATALYTIC
REDUCTION SYSTEM
REQUIREMENTS
Only use diesel exhaust fluid that iscertified by the American PetroleumInstitute (API).
You can purchase diesel exhaust fluid atan authorized dealer, or contact roadsideassistance for help in finding a retailer thatsells diesel exhaust fluid.
Note:Non-certified diesel exhaust fluid usecan cause damage that your Warranty maynot cover
SELECTIVE CATALYTIC
REDUCTION SYSTEM
GUIDELINES
•Diesel exhaust fluid is non-flammable,non-toxic, colorless and water-solubleliquid.
•In order for the system to operatecorrectly you must maintain the dieselexhaust fluid level.
•Do not overfill the diesel exhaust fluidtank.
•Diesel exhaust fluid is corrosive.
•Avoid spilling diesel exhaust fluid onpainted surfaces, carpeting or plasticcomponents. Immediately wipe awayany diesel exhaust fluid that has spilledwith a damp cloth and water. If it hasalready crystallized, use warm waterand a sponge.
•Do not store the diesel exhaust fluidbottle in your vehicle. If it leaks it couldcause damage to interior componentsor release an ammonia odor inside yourvehicle.
•Do not re-use the diesel exhaust fluidcontainer once it is emptied.
•Store diesel exhaust fluid out of directsunlight and in temperatures between23–68°F (-5–20°C).
•The system has a diesel exhaust fluidquality sensor. Dilution of dieselexhaust fluid or use of any other liquidin the selective catalytic reductionsystem leads to a diesel exhaust fluidsystem fault, eventually leading to thevehicle only operating in idle-onlymode.
•Do not dilute diesel exhaust fluid withwater or any other liquid.
FILLING THE SELECTIVE
CATALYTIC REDUCTION
SYSTEM TANK
FILLING THE SELECTIVECATALYTIC REDUCTION SYSTEMTANK IN COLD WEATHER
Diesel exhaust fluid may freeze if theambient temperature is below 12°F (-11°C).Your vehicle has a preheating systemwhich allows diesel exhaust fluid tooperate below 12°F (-11°C). If you do notuse your vehicle for an extended periodwhen the ambient temperature is below12°F (-11°C), the fluid in the tank mayfreeze.
228
2023 Super Duty (TFH) Canada/United States of America, enUSA, Edition date: 202211, DOMSelective Catalytic Reduction System (If Equipped)E163354

The warning lamp illuminates and amessage appears in the informationdisplay if the system becomescontaminated or inoperative.
SELECTIVE CATALYTIC REDUCTION SYSTEM – INFORMATIONMESSAGES
ActionMessage
The distance you can travel before depleting the remainingdiesel exhaust fluid. Refill as soon as possible.DEF Level Range: XX mi/km Refill Now
Your diesel exhaust fluid is nearing empty. Your vehicle’s topspeed will become limited in the displayed distance. You mustreplenish the diesel exhaust fluid to resume normal operationof your vehicle. See Diesel Exhaust Fluid Capacity andSpecification (page 230).
DEF Level Empty SpeedLimited to XX MPH / km/h in XX mi/km
Your remaining diesel exhaust fluid has depleted. Your speedwill be limited upon restart. You must replenish the dieselexhaust fluid to resume normal operation of your vehicle. SeeDiesel Exhaust Fluid Capacity and Specification (page230).
DEF Level Empty SpeedLimited to XX MPH/km/h Upon Restart
The diesel exhaust fluid is empty. You must replenish thediesel exhaust fluid to resume normal operation of yourvehicle. See Diesel Exhaust Fluid Capacity and Specific-ation (page 230).
DEF Level Low SpeedLimited to XX MPH/km/h
The selective catalytic reduction system detects low exhaustfluid. The engine will eventually enter into an idle only mode.You must replenish the diesel exhaust fluid to resume normaloperation of your vehicle. See Diesel Exhaust Fluid Capa-city and Specification (page 230).
DEF Level Empty EngineIdled Soon
The vehicle will enter into an idle only mode. You mustreplenish the diesel exhaust fluid to resume normal operationof your vehicle. See Diesel Exhaust Fluid Capacity andSpecification (page 230).
DEF Level Empty EngineIdled See Manual
The selective catalytic reduction system detects a fault. Thevehicle’s top speed will become limited in the displayeddistance and count down from this point. Have your vehiclechecked as soon as possible.
DEF Fault Speed Limitedto XX MPH/km/h in XXmi/km
231
2023 Super Duty (TFH) Canada/United States of America, enUSA, Edition date: 202211, DOMSelective Catalytic Reduction System (If Equipped)

ActionMessage
The selective catalytic reduction system detects a fault. Thevehicle’s top speed will become limited upon restarting. Haveyour vehicle checked as soon as possible.
DEF Fault Speed Limitedto XX MPH/km/h UponRestart
The selective catalytic reduction system detects a fault. Thevehicle’s top speed is limited. Have your vehicle checked assoon as possible.
DEF Fault Speed Limitedto XX MPH/km/h
The selective catalytic reduction system detects a fault. Theengine will eventually enter into an idle only mode. Have yourvehicle checked as soon as possible.
DEF Fault Engine IdledSoon
232
2023 Super Duty (TFH) Canada/United States of America, enUSA, Edition date: 202211, DOMSelective Catalytic Reduction System (If Equipped)

MANUAL (M)
In manual (M) you can select a specificgear. See Manually Shifting Gears (page235).
Note:We recommend using this mode fordriving on hilly or mountainous roads orwhen towing a trailer. See Towing a Trailer(page 365).
SHIFTING YOUR VEHICLE INTO
GEAR
The transmission selector is on the steeringcolumn.
1.Press and hold the brake pedal.
2.Move the lever to select a position.
3.Press the manual (M) button whenyour vehicle is in drive (D) to enter orexit mode.
AUTOMATIC TRANSMISSION
POSITION INDICATORS
The instrument cluster displays the currentposition.
Note:The position could illuminate on thetransmission selector.
MANUALLY SHIFTING GEARS
SHIFTING USING THE BUTTONSON THE COLUMN SHIFTER
The instrument cluster displays the currentgear. The current gear flashes when yourvehicle cannot shift into the requestedgear. Your vehicle will not shift if therequested gear raises or lowers the enginespeed beyond the limit.
Your vehicle could shift when you fullypress the accelerator or brake pedal.
Note:Prolonged driving with high enginespeed could cause vehicle damage notcovered by vehicle warranty.
Note:Drive modes could affect when thevehicle shifts into the requested gear.
235
2023 Super Duty (TFH) Canada/United States of America, enUSA, Edition date: 202211, DOMAutomatic TransmissionE371381 E341776 E372904

HOW DOES FOUR-WHEEL
DRIVE WORK
Using the Electronic Shift On theFly System (If Equipped)
This four-wheel drive system utilizes a2-speed Electronic Shift On the Fly (ESOF)transfer case which is also known as apart-time system. This system offers thedriver two-wheel drive high, four-wheeldrive high, and four-wheel drive low asavailable modes of operation. When youselect either four-wheel drive high orfour-wheel drive low, the system providesmechanically locked four-wheel drivepower to both the front and rear wheelsfor use in off-road or slippery conditionssuch as deep snow, sand or mud. Whenyou select four-wheel drive low, the systemprovides additional gearing for increasedtorque multiplication for conditions likedeep sand, steep slopes, or pulling heavyobjects. Additionally, the system is capableof recreational flat towing by putting thetransfer case into a neutral position. SeeRecreationally Towing Your Vehicle(page 427).
There is further information available ondriving in unique driving conditions. SeeOff-Road Driving (page 412).
Your vehicle has manual hub locks on thedriver side and passenger side of yourvehicle. For proper operation, make surethat each hub is fully engaged and thatboth hub locks are set to the same position(both set to lock or both set to auto). Toengage lock, turn the hub locks completelyclockwise. To engage auto, turn the hublocks completely counterclockwise.
The ESOF four-wheel drive system:
•Provides 4x4 High engagement anddisengagement while the vehicle ismoving.
•Operates by a push button controllocated on the instrument panel thatallows you select 4x2, 4x4 High or 4x4Low operation.
•Uses auto-manual hub locks. When setto auto, the hubs engage anddisengage automatically based on the4x4 mode you select. When set to lock,the hubs remain engaged at all times.
•Increases fuel economy when used inthe hub lock's recommended automode.
Note:Auto-manual hub locks manuallylock by rotating the hub lock control fromauto to lock.
Note:Hub locks should be in auto modewhen in 4x2 mode. If hub locks are in lockmode in 4x2 mode, there will be additionalnoise from the front axle.
238
2023 Super Duty (TFH) Canada/United States of America, enUSA, Edition date: 202211, DOMFour-Wheel Drive (If Equipped)LOCKOTUAE339076

FOUR-WHEEL DRIVE
PRECAUTIONS
WARNING: Vehicles with a highercenter of gravity (utility and four-wheeldrive vehicles) handle differently thanvehicles with a lower center of gravity(passenger cars). Avoid sharp turns,excessive speed and abrupt steering inthese vehicles. Failure to drive cautiouslyincreases the risk of losing control of yourvehicle, vehicle rollover, personal injuryand death.
WARNING: Do not becomeoverconfident in the ability of four-wheeldrive vehicles. Although a four-wheeldrive vehicle may accelerate better thana two-wheel drive vehicle in low tractionsituations, it won't stop any faster thantwo-wheel drive vehicles. Always driveat a safe speed.
Truck and utility vehicles can differ fromsome other vehicles. Your vehicle could behigher to allow it to travel over roughterrain without getting stuck or damagingunderbody components. The differencesthat make your vehicle so versatile alsomake it handle differently than an ordinarypassenger car. Always maintain steeringwheel control, especially in rough terrain.Since sudden changes in terrain can resultin abrupt steering wheel motion, make sureyou grip the steering wheel from theoutside. Do not grip the spokes. Drivecautiously to avoid vehicle damage fromconcealed objects such as rocks andstumps. Drive slower in strong crosswindswhich can affect the normal steeringcharacteristics of your vehicle. Beextremely careful when driving onpavement made slippery by loose sand,water, gravel, snow or ice.
Note:Your vehicle may come with a frontair dam that can become damaged (due toreduced ground clearance) when taking yourvehicle off-road. This air dam can be takenoff by removing 15 bolts.
Parking
WARNING: If the parking brake isfully released, but the brake warninglamp remains illuminated, the brakesmay not be working properly. Have yourvehicle checked as soon as possible.
WARNING: Apply the parkingbrake, shift into park (P), switch theignition off and remove the key beforeyou leave your vehicle. Failure to followthis instruction could result in personalinjury or death.
On some four-wheel drive vehicles, whenthe transfer case is in the neutral (N)position, the engine and transmissiondisconnects from the rest of the driveline.Therefore, your vehicle is free to roll evenif the automatic transmission is in park (P).Do not leave the vehicle unattended withthe transfer case in the neutral (N)position. Always set the parking brake fullyand turn off the ignition when leaving yourvehicle.
FOUR-WHEEL DRIVE
LIMITATIONS
Do not use four-wheel drive high orfour-wheel drive low mode on dry, hardsurface roads. Doing so can produceexcessive noise, increase tire wear and candamage drive components. Four-wheeldrive high or four-wheel drive low modesare intended for consistently slippery orloose surfaces. Use of four low mode onthese surfaces could produce some noise,such as occasional clunks, but should not
239
2023 Super Duty (TFH) Canada/United States of America, enUSA, Edition date: 202211, DOMFour-Wheel Drive (If Equipped)

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.
245
2023 Super Duty (TFH) Canada/United States of America, enUSA, Edition date: 202211, DOMElectronic Locking Differential (If Equipped)E373433