brake fluid RAM CHASSIS CAB 2023 Owners Manual

5
ENGINE BREAK-IN RECOMMENDATIONS —
DIESEL ENGINE .................................................... 128
PARKING BRAKE ................................................ 128

DIESEL EXHAUST BRAKE (ENGINE BRAKING) .. 129
AUTOMATIC TRANSMISSION.............................. 130 Ignition Park Interlock ................................... 131Brake/Transmission Shift Interlock (BTSI)
System .......................................................... 131
8-Speed Automatic Transmission —
If Equipped .................................................... 132
6-Speed Automatic Transmission —
If Equipped .................................................... 135
AUXILIARY SWITCHES — IF EQUIPPED ............. 139
FOUR-WHEEL DRIVE OPERATION —
IF EQUIPPED ........................................................ 140
Electronically Shifted Transfer Case
(8-Speed Transmission) — If Equipped ....... 140Electronically Shifted Transfer Case
(6-Speed Transmission) —
If Equipped..................................................... 143
Manually Shifted Transfer Case —
If Equipped..................................................... 145
LIMITED-SLIP DIFFERENTIAL ............................ 147
POWER TAKE OFF (PTO) OPERATION —
IF EQUIPPED ........................................................ 147
HYDRAULIC POWER STEERING .........................148
Power Steering Fluid Check .......................... 148

CRUISE CONTROL SYSTEMS — IF EQUIPPED .... 148

Cruise Control ............................................... 149
Adaptive Cruise Control (ACC) ...................... 150 PARKSENSE FRONT/REAR PARK ASSIST —
IF EQUIPPED ....................................................... 159
ParkSense Sensors ....................................... 159
ParkSense Warning Display ......................... 159
ParkSense Display ........................................ 159Enabling And Disabling ParkSense .............. 162
Service The ParkSense Park Assist System ...162

Cleaning The ParkSense System ................. 162
ParkSense System Usage Precautions........ 162
LANESENSE — IF EQUIPPED ............................. 163
LaneSense Operation ................................... 163Turning LaneSense On Or Off ....................... 164
LaneSense Warning Message ...................... 164Changing LaneSense Status ........................ 166
Turn Signal Activated Blind Spot Assist —
If Equipped..................................................... 166
PARKVIEW REAR BACK UP CAMERA............... 166
SURROUND VIEW CAMERA SYSTEM —
IF EQUIPPED ........................................................ 168
TRAILER CAMERAS — IF EQUIPPED ................. 173 Trailer Surround View Camera System —
If Equipped..................................................... 173AUX Camera — If Equipped ........................... 176
ENGINE RUNAWAY ............................................. 176
REFUELING THE VEHICLE—
GASOLINE ENGINE ............................................. 177
Loose Fuel Filler Cap Message ................... 177
REFUELING THE VEHICLE — DIESEL ENGINE... 177
Diesel Exhaust Fluid...................................... 178 VEHICLE LOADING .............................................. 180
Gross Vehicle Weight Rating (GVWR) ......... 180
Payload .......................................................... 180Gross Axle Weight Rating (GAWR)................ 180Tire Size ......................................................... 181
Rim Size ......................................................... 181
Inflation Pressure .......................................... 181Curb Weight ................................................... 181
Loading .......................................................... 181
TRAILER TOWING ................................................ 181
Common Towing Definitions......................... 181
Trailer Hitch Type and Maximum Trailer
Weight ............................................................ 185
Trailer Towing Weights (Maximum Traile
r Weight Ratings) .......................................... 186Trailer And Tongue Weight .......................... 186
Towing Requirements .................................. 186Towing Tips ................................................... 192
SNOWPLOW — IF EQUIPPED.............................. 192
Before Plowing .............................................. 192

Snowplow Prep Package Model Availability....193

Over The Road Operation With Snowplow
Attached......................................................... 193
Operating Tips ............................................... 193General Maintenance ................................... 193

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7
SAFETY TIPS ........................................................ 321 Transporting Passengers .............................. 321Transporting Pets ......................................... 322
Connected Vehicles....................................... 322
Safety Checks You Should Make Inside The
Vehicle ........................................................... 322Periodic Safety Checks You Should Make
Outside The Vehicle ...................................... 323Exhaust Gas ................................................... 324Carbon Monoxide Warnings ......................... 324
IN CASE OF EMERGENCY
HAZARD WARNING FLASHERS ........................ 325
ASSIST AND SOS SYSTEM — IF EQUIPPED ...... 326
JACKING AND TIRE CHANGING.......................... 329 4500/5500 Models ...................................... 329Preparations For Jacking .............................. 329Jacking Instructions 4500 And
5500 Series ................................................... 330To Stow The Flat Or Spare — If Equipped ... 332
Hub Caps/Wheel Covers —If Equipped ........ 332
JUMP STARTING .................................................. 333
Preparations For Jump Start......................... 333Jump Starting Procedure .............................. 334
IF YOUR ENGINE OVERHEATS ........................... 335
GEAR SELECTOR OVERRIDE .............................. 336 6–Speed Transmission — If Equipped ........ 336 MANUAL PARK RELEASE ................................... 337
8–Speed Transmission — If Equipped ......... 337
FREEING A STUCK VEHICLE .............................. 338
TOWING A DISABLED VEHICLE ......................... 339
Two-Wheel Drive Models .............................. 340Four-Wheel Drive Models ............................. 340
Emergency Tow Hooks — If Equipped .......... 341
ENHANCED ACCIDENT RESPONSE SYSTEM
(EARS) .................................................................. 341
EVENT DATA RECORDER (EDR) ........................ 341
SERVICING AND MAINTENANCE
SCHEDULED SERVICING ................................... 342
Maintenance Plan — Gasoline Engine ......... 344Maintenance Plan — Diesel Engine ............ 346
ENGINE COMPARTMENT .................................... 350
6.4L Gasoline Engine ................................... 3506.7L Diesel Engine ........................................ 351Checking Oil Level ......................................... 352
Adding Washer Fluid .................................... 352
Maintenance-Free Battery ............................ 352
Pressure Washing ......................................... 353 VEHICLE MAINTENANCE .................................... 353
Engine Oil ...................................................... 353
Engine Oil Filter ............................................. 354Engine Air Cleaner Filter .............................. 355
Air Conditioner Maintenance ....................... 357
Accessory Drive Belt Inspection ................... 359Draining Fuel/Water Separator Filter .......... 360
Engine Mounted Fuel Filter Replacement ... 361Underbody Mounted Fuel Filter
Replacement ................................................. 362

Priming If The Engine Has Run Out Of Fuel ...363

Intervention Regeneration Strategy —
Message Process Flow ................................ 364Diesel Exhaust Fluid (DEF) ........................... 364
Body Lubrication ........................................... 364
Windshield Wiper Blades.............................. 365
Exhaust System ............................................ 367
Cooling System ............................................. 368Charge Air Cooler — Inter-Cooler ................. 370
Brake System ............................................... 371Automatic Transmission ............................... 372
Rear Axle And 4x4 Front Driving Axle
Fluid Level ..................................................... 374
Transfer Case ............................................... 374Noise Control System Required
Maintenance & Warranty ............................ 374
Fuses.............................................................. 377
Bulb Replacement ........................................ 384

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8
TIRES ..................................................................... 389 Tire Safety Information ................................ 389
Tires — General Information ......................... 397Tire Types ....................................................... 400
Spare Tires — If Equipped ............................ 401
Wheel And Wheel Trim Care ........................ 403
Snow Traction Devices ................................. 404Tire Rotation Recommendations ................. 405
DEPARTMENT OF TRANSPORTATION UNIFORM
TIRE QUALITY GRADES ...................................... 406
Treadwear ...................................................... 406Traction Grades ............................................. 407
Temperature Grades ..................................... 407
STORING THE VEHICLE ...................................... 407
BODYWORK .......................................................... 407 Protection From Atmospheric Agents .......... 407
Body And Underbody Maintenance.............. 408
Preserving The Bodywork ............................. 408
INTERIORS ........................................................... 409
Seats And Fabric Parts.................................. 409
Plastic And Coated Parts .............................. 409Leather Surfaces ........................................... 410Glass Surfaces .............................................. 410
TECHNICAL SPECIFICATIONS
VEHICLE IDENTIFICATION NUMBER (VIN) ....... 411
BRAKE SYSTEM .................................................. 411
Hydraulic Brake Assist —If Equipped ........... 411 WHEEL AND TIRE TORQUE SPECIFICATIONS .. 411
Torque Specifications ................................... 411
FUEL REQUIREMENTS— GASOLINE ENGINE ... 413
6.4L Engine ................................................... 413
Reformulated Gasoline ................................ 413Materials Added To Fuel ............................... 413
Gasoline/Oxygenate Blends ......................... 414

Do Not Use E-85 In Non-Flex Fuel Vehicles ....414

CNG And LP Fuel System Modifications ...... 414Methylcyclopentadienyl Manganese
Tricarbonyl (MMT) In Gasoline...................... 414Fuel System Cautions ................................... 415
FUEL REQUIREMENTS – DIESEL ENGINE ....... 415
Fuel Specifications ....................................... 416
Biodiesel Fuel Requirements ....................... 416
FLUID CAPACITIES ............................................. 418
ENGINE FLUIDS AND LUBRICANTS .................. 419
CHASSIS FLUIDS AND LUBRICANTS ................ 421
CUSTOMER ASSISTANCE
SUGGESTIONS FOR OBTAINING SERVICE FOR
YOUR VEHICLE .................................................... 422
Prepare For The Appointment ...................... 422Prepare A List ................................................ 422Be Reasonable With Requests..................... 422 IF YOU NEED ASSISTANCE ................................ 422
Roadside Assistance..................................... 422FCA US LLC Customer Center....................... 424
FCA Canada Inc. Customer Center .............. 424
Mexico............................................................ 424
Puerto Rico And US Virgin Islands ............... 424
Customer Assistance For The Hearing Or
Speech Impaired(TDD/TTY) .......................... 424
Service Contract ........................................... 424
WARRANTY INFORMATION ................................ 425
MOPAR® PARTS ................................................. 425
REPORTING SAFETY DEFECTS .......................... 425
In The 50 United States And
Washington, D.C............................................ 425
In Canada ...................................................... 426
PUBLICATION ORDER FORMS .......................... 426
GENERAL INFORMATION.................................... 427
CHANGE OF OWNERSHIP OR ADDRESS .......... 427

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12 Yellow Warning Lights
Adaptive Cruise Control (ACC) Fault Warning Light Úpage 105
Anti-Lock Brake System (ABS) Warning Light Úpage 108
Cruise Control Fault Warning Light Úpage 108
Engine Check/Malfunction Indicator Warning Light (MIL) Úpage 105
Electronic Stability Control (ESC) Active Warning Light Úpage 106
Electronic Stability Control (ESC) OFF Warning Light Úpage 106
LaneSense Warning Light Úpage 106
Low Washer Fluid Warning Light Úpage 106
Low Fuel Warning Light
Úpage 107
Low Coolant Level Warning Light Úpage 107
Loose Fuel Filler Cap Warning Light Úpage 107
Service Forward Collision Warning (FCW) Light Úpage 108
Service LaneSense Warning Light Úpage 108
Service 4WD Warning Light Úpage 108
Tire Pressure Monitoring System (TPMS) Warning Light Úpage 107
Yellow Warning Lights

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13
Yellow Indicator Lights Cargo Indicator Light Úpage 108
Cold Ambient Derate Mode Indicator Light Úpage 109
Diesel Exhaust Brake Indicator Light Úpage 109
Forward Collision Warning (FCW) Off Indicator Light Úpage 108
Low Diesel Exhaust Fluid (DEF) Indicator Light Úpage 109
NEUTRAL Indicator Light Úpage 109
4WD Lock Indicator Light Úpage 109
4WD Low Indicator Light Úpage 109
4WD High Indicator Light
Úpage 109
Snowplow Mode Indicator Light Úpage 109
TOW/HAUL Indicator Light Úpage 108
Trailer Merge Assist Indicator Light Úpage 108
Wait To Start Indicator Light Úpage 109
Water In Fuel Indicator Light Úpage 109
Yellow Indicator Lights1

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GETTING TO KNOW YOUR INSTRUMENT PANEL103
RED WARNING LIGHTS
Seat Belt Reminder Warning Light
This warning light indicates when the
driver or passenger seat belt is
unbuckled. When the ignition is first
placed in the ON/RUN or ACC/ON/RUN
position and if the driver’s seat belt is unbuckled,
a chime will sound and the light will turn on. When
driving, if the driver or front passenger seat belt
remains unbuckled, the Seat Belt Reminder Light
will flash or remain on continuously and a chime
will sound Ú page 288.
Air Bag Warning Light

This warning light will illuminate to indicate
a fault with the air bag, and will turn on for
four to eight seconds as a bulb check
when the ignition is placed in the ON/RUN
or ACC/ON/RUN position. This light will illuminate
with a single chime when a fault with the air bag has
been detected, it will stay on until the fault is
cleared. If the light is not on during startup, stays on,
or turns on while driving, have the system inspected
at an authorized dealer as soon as possible.

Brake Warning Light
This warning light monitors various brake
functions, including brake fluid level and
parking brake application. If the brake
light turns on it may indicate that the parking brake is applied, that the brake fluid level
is low, or that there is a problem with the Anti-Lock
Brake System reservoir.
If the light remains on when the parking brake has
been disengaged, and the fluid level is at the full
mark on the master cylinder reservoir, it indicates
a possible brake hydraulic system malfunction or
that a problem with the Brake Booster has been
detected by the Anti-Lock Brake System (ABS) /
Electronic Stability Control (ESC) system. In this
case, the light will remain on until the condition has
been corrected. If the problem is related to the
brake booster, the ABS pump will run when
applying the brake, and a brake pedal pulsation
may be felt during each stop.
The dual brake system provides a reserve braking
capacity in the event of a failure to a portion of the
hydraulic system. A leak in either half of the dual
brake system is indicated by the Brake Warning
Light, which will turn on when the brake fluid level
in the master cylinder has dropped below a
specified level.
The light will remain on until the cause is corrected.
NOTE:The light may flash momentarily during sharp
cornering maneuvers, which change fluid level
conditions. The vehicle should have service
performed, and the brake fluid level checked.
If brake failure is indicated, immediate repair is
necessary.
Vehicles equipped with the Anti-Lock Brake System
(ABS) are also equipped with Electronic Brake
Force Distribution (EBD). In the event of an EBD
failure, the Brake Warning Light will turn on along
with the ABS Light. Immediate repair to the ABS
system is required.
Operation of the Brake Warning Light can be
checked by turning the ignition switch from the OFF
position to the ON/RUN position. The light should
illuminate for approximately two seconds. The light
should then turn off unless the parking brake is
applied or a brake fault is detected. If the light does
not illuminate, have the light inspected by an
authorized dealer.
The light also will turn on when the parking brake
is applied with the ignition switch in the ON/RUN
position.NOTE:This light shows only that the parking brake is
applied. It does not show the degree of brake appli
-
cation.
WARNING!
Driving a vehicle with the red brake light on is
dangerous. Part of the brake system may have
failed. It will take longer to stop the vehicle. You
could have a collision. Have the vehicle checked
immediately.
3

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GETTING TO KNOW YOUR INSTRUMENT PANEL105
Electric Power Steering (EPS) Fault
Warning Light
This warning light will turn on when
there's a fault with the EPS system
Úpage 148.
Trailer Brake Disconnected Warning Light
This warning light will illuminate when the
Trailer Brake has been disconnected
Úpage 181.
Transmission Temperature Warning Light
This warning light will illuminate to warn
of a high transmission fluid temperature.
This may occur with strenuous usage
such as trailer towing. If this light turns
on, stop the vehicle and run the engine at idle or
slightly faster, with the transmission in PARK or
NEUTRAL, until the light turns off. Once the light
turns off, you may continue to drive normally.
Door Open Warning Light
This indicator will illuminate when a door
is ajar/open and not fully closed.
NOTE:If the vehicle is moving there will also be a single
chime.
YELLOW WARNING LIGHTS
Adaptive Cruise Control (ACC) Fault
Warning Light — If Equipped
This warning light will illuminate to
indicate a fault in the ACC system.
Contact a local authorized dealer for
service Ú page 150.
Engine Check/Malfunction Indicator
Warning Light (MIL)
The Engine Check/Malfunction Indicator
Light (MIL) is a part of an Onboard
Diagnostic System called OBD II that
monitors engine and automatic
transmission control systems. This warning light
will illuminate when the ignition is in the ON/RUN
position before engine start. If the bulb does not
come on when turning the ignition switch from OFF
to ON/RUN, have the condition checked promptly.
Certain conditions, such as a loose or missing gas
cap, poor quality fuel, etc., may illuminate the light
after engine start. The vehicle should be serviced if
the light stays on through several typical driving
styles. In most situations, the vehicle will drive
normally and will not require towing.
WARNING!
Continued operation with reduced assist could
pose a safety risk to yourself and others. Service
should be obtained as soon as possible.
WARNING!
If you continue operating the vehicle when the
Transmission Temperature Warning Light is
illuminated you could cause the fluid to boil over,
come in contact with hot engine or exhaust
components and cause a fire.
CAUTION!
Continuous driving with the Transmission
Temperature Warning Light illuminated will
eventually cause severe transmission damage
or transmission failure.
3

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GETTING TO KNOW YOUR INSTRUMENT PANEL109
Snowplow Mode Indicator Light —
If Equipped
This indicator light will illuminate when
Snowplow mode has been activated
Úpage 192.

Cold Ambient Derate Mode Indicator Light —
If Equipped

This indicator light will illuminate when a
derate (engine power reduction) is
activated for protection of the
turbocharger in cold ambient
temperatures.
Diesel Exhaust Brake Indicator Light —
If Equipped
This indicator light will illuminate when
the Diesel Exhaust Brake has been
activated, and is in full strength mode
Ú page 129.
4WD Lock Indicator Light
This light alerts the driver that the vehicle
is in the 4WD Lock mode. The front and
rear driveshafts are mechanically locked
together, forcing the front and rear
wheels to rotate at the same speed Ú page 140.
4WD Low Indicator Light — If Equipped
This light alerts the driver that the vehicle
is in the 4WD Low mode. The front and
rear driveshafts are mechanically locked
together forcing the front and rear
wheels to rotate at the same speed. Low range
provides a greater gear reduction ratio to provide
increased torque at the wheels Ú page 140.
4WD High Indicator Light — If Equipped
This light alerts the driver that the vehicle
is in the 4WD High mode. The front and
rear driveshafts are mechanically locked
together forcing the front and rear
wheels to rotate at the same speed.
NEUTRAL Indicator Light — If Equipped
This light alerts the driver that the 4WD
power transfer case is in the NEUTRAL
mode and the front and rear driveshafts
are disengaged from the powertrain.
Low Diesel Exhaust Fluid (DEF) Indicator
Light — If Equipped
The Low DEF Indicator will illuminate if
the vehicle is low on DEF Ú page 364.
Wait To Start Indicator Light — If Equipped
This indicator light will illuminate for
approximately two seconds when the
ignition is turned to the RUN position. Its
duration may be longer based on colder
operating conditions. Vehicle will not initiate start
until telltale is no longer displayed Ú page 117.
NOTE:The Wait To Start Indicator Light may not illuminate
if the intake manifold temperature is warm
enough.
Water In Fuel Indicator Light — If Equipped
The Water In Fuel Indicator Light will
illuminate when there is water detected
in the fuel filter. If this light remains on,
DO NOT start the vehicle before you drain
the water from the fuel filter to prevent engine
damage Ú page 360.
GREEN INDICATOR LIGHTS
Adaptive Cruise Control (ACC) Set With
Target Indicator Light — If Equipped
This will display when the ACC is set and
a the vehicle in front is detected
Úpage 150.
3

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124STARTING AND OPERATING
ENGINE IDLING

Avoid prolonged idling. Long periods of idling may be
harmful to your engine because combustion
chamber temperatures can drop so low that the fuel
may not burn completely. Incomplete combustion
allows carbon and varnish to form on piston rings,
engine valves, and injector nozzles. Also, the
unburned fuel can enter the crankcase, diluting the
oil and causing rapid wear to the engine.

If the engine is allowed to idle or the truck is driven
on low engine speed drive cycles for more than two
hours, the system will automatically enter an
emissions operating mode that will increase the
engine idle speed to 900 RPM (1,050 RPM for
Chassis Cab). While in this mode, which is
designed to help maintain the Diesel Particulate
Filter, the engine idle speed will return to normal
when the brake pedal is applied. A small change in
engine tone or a slight change in engine
performance while accelerating may also be
noticeable at speeds below 20 mph (32 km/h).
This operating mode may last for up to an hour of
idle time, or around 20 minutes of driving time.

Your truck may have been ordered with an optional
voltage monitoring idle up feature. If a load is placed
on the electrical system while the truck is in PARK,
this feature will attempt to maintain normal system
voltage by automatically increasing engine idle
speed. You may notice several consecutive increases
in idle speed, up to a maximum of 1,450 RPM, as the system will attempt to utilize the smallest increase in
idle speed necessary to maintain normal system
voltage. The idle speed will return to normal when
either the electrical load is removed, or when the
brake pedal is applied.

NOTE:For instrument cluster display messages related to
the vehicle's exhaust system Ú
page 89.
Idle-Up Feature
The driver-controlled high idle speed feature will
help increase cylinder temperatures and provide
additional cab heat, however, excessive idling may
still cause the exhaust after-treatment system to
not properly regenerate. Extended periods of idle
time should be avoided.
The Idle-Up feature uses the Cruise Control buttons
to increase engine idle speed and quickly warm the
vehicle's interior.

1. With the transmission in PARK, the parking
brake applied, and the engine running, turn
on the Cruise Control, then push the SET (-)
button.

2. The engine RPM will go up to 1,100 RPM. To increase the RPM, push and hold the RES (+)
button and the idle speed will increase to
approximately 1,500 RPM. To decrease the
RPM, push and hold the SET (-) button and the
idle speed will decrease to approximately
1,100 RPM. 3. To cancel the Idle–Up feature, either push the
CANCEL button, push the ON/OFF button, or
press the brake pedal.
NOISE
Diesel engines can create noises that may seem
as a concern. The nature of a diesel engine is
compression ignition where compressed air and
fuel are mixed and ignited. Weather, barometric
pressure, altitude and temperature will affect how
fuel is ignited in the engine. Engines will sound
different from day to day or previous model years.
Clicking, ticking, or light knocking is normal and will
change from day to day, as the engine breaks in,
and can vary with changes in ambient
temperature; this is normal. Diesel equipped
vehicles also have an exhaust after treatment
system to reduce emissions utilizing a Diesel
Particulate Filter (DPF) and a Selective Reduction
Catalyst (SCR). The SCR reduces Nox using the
Diesel Exhaust Fluid (DEF) system. DEF is injected
directly into the SCR through an dosing module.
This process will create a clicking sound and at
times, will make noise even with the vehicle shut
off. This is normal as the DEF dosing module is
purging DEF. If at any time the check engine light is
on, please visit an authorized dealer.

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138STARTING AND OPERATING
You can switch between DRIVE and ERS mode at
any vehicle speed. When the gear selector is in the
DRIVE position, the transmission will operate
automatically, shifting between all available gears.
Tapping the ERS “-” switch will activate ERS mode,
display the current gear in the instrument cluster,
and set that gear as the top available gear. Once in
ERS mode, tapping “-” or “+” will change the top
available gear.

Electronic Range Select

To exit ERS mode, simply push and hold the
ERS “+” switch until the gear limit display
disappears from the instrument cluster.
NOTE:To select the proper gear position for maximum
deceleration (engine braking), simply push and
hold the ERS “-” switch. The transmission will shift
to the range from which the vehicle can best be
slowed down.
Overdrive Operation

The automatic transmission includes an
electronically controlled Overdrive (FIFTH and SIXTH
gears). The transmission will automatically shift into
Overdrive if the following conditions are present:

The gear selector is in the DRIVE position.
The transmission fluid has reached an
adequate temperature.
The engine coolant has reached an adequate
temperature.
Vehicle speed is sufficiently high.
The TOW/HAUL switch has not been activated.
The driver is not heavily pressing the acceler -
ator.
When To Use TOW/HAUL Mode
When driving in hilly areas, towing a trailer, carrying
a heavy load, etc., and frequent transmission
shifting occurs, push the TOW/HAUL switch to
activate TOW/HAUL mode. This will improve
performance and reduce the potential for
transmission overheating or failure due to
excessive shifting. When operating in TOW/HAUL
mode, transmission upshifts are delayed, and the
transmission will automatically downshift (for
engine braking) when the throttle is closed and/or
during steady braking maneuvers.

TOW/HAUL Switch

1 — GEAR “+” Switch
2 — GEAR “–” Switch
WARNING!
Do not downshift for additional engine braking
on a slippery surface. The drive wheels could
lose their grip and the vehicle could skid,
causing a collision or personal injury.
CAUTION!
When using ERS for engine braking while
descending steep grades, be careful not to
overspeed the engine. Apply the brakes as
needed to prevent engine overspeed.

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