reset RAM CHASSIS CAB 2023 User Guide

GETTING TO KNOW YOUR INSTRUMENT PANEL95
Pitch And Roll
Displays the pitch and roll of the vehicle in
the graphic with the angle number on the
screen.
NOTE:When vehicle speed becomes too high to display
the pitch and roll, “- -” will display in place of the
numbers, and the graphic will be greyed out. A
message indicating the necessary speed for the
feature to become available will also display.
Fuel Economy — If Equipped
Push and release the up or down arrow
button until the Fuel Economy menu item is
highlighted in the instrument cluster display. Push
and Hold the right arrow button to reset
Average Fuel Economy.
Current Fuel Economy Gauge
Average Fuel Economy Value
Range To Empty
Fuel Tank Levels — If Equipped
Trip A/Trip B
Push and release the up or down arrow
button until the Trip menu item is highlighted in the
instrument cluster display. Push and release the
right arrow button to enter the submenus of Trip A and Trip B. The Trip A or Trip B information
will display the following:
Distance
Average Fuel Economy
Elapsed Time
Push and hold right arrow button to reset all
information.
Navigation — If Equipped
Push and release the up or down arrow
button until the Navigation display title is
highlighted in the instrument cluster display, “Hold
OK to Start Route” will display when no active route
is set. “Hold OK to Cancel Route” will display when
active route is set. Use the left or right arrow
button to zoom in or out on the display
Ú page 199.
Trailer Tow
Push and release the up or down arrow
button until the Trailer Tow menu item is
highlighted in the instrument cluster display. Push
and release the right or left arrow button to
cycle through the following trailer tow information:
Trip (trailer specific) Distance: Push and hold
the OK button to reset the distance.
Integrated Trailer Brake Module (ITBM):
Braking Output
Trailer Type
ITBM Gain
Trailer Tire Pressure Monitoring: The Instrument
Cluster Display will display the Trailer Tire Pres -
sure for a connected trailer with sensors that
match the active trailer profile. When a low tire
is present, the low tire value will be displayed in
red, and the affected low tire will have a red
glow. “Trailer Tire Low“ will be displayed on the
center bottom of the Instrument Cluster Display
screen.
Trailer Light Check – If Equipped: Push and hold
the OK button to begin the Trailer Light Test
sequence Ú page 190.
For vehicles equipped with Blind Spot Monitoring
(BSM):
When a Trailer Brake signal is detected, a
pop-up message will appear in the cluster
requiring user to select trailer type.
If a conventional trailer is selected, the BSM
operation will function as normal.
If Gooseneck/5th Wheel trailer is selected
BSM will be disabled due to unsupported
trailer type.
If no selection is made, the BSM system will
remain on until a selection is chosen.
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98GETTING TO KNOW YOUR INSTRUMENT PANEL
Fuel Gauge
Hide Range
Show Range
Defaults (Restores All Settings To Default Settings)
Restore
Cancel
Commercial Settings — If Equipped
Commercial Settings allows the driver to set and
recall additional features when the transmission is
in PARK.
Push and release the up or down arrow
button until Commercial Settings displays in the
instrument cluster display.
Follow the prompts to enter the required PIN and
enter the Commercial Settings submenu.
NOTE:If your vehicle is equipped with a touchscreen
radio, “Commercial Settings” will replace “Vehicle
Settings” in the instrument cluster display. The
Commercial Settings menu will only include the
settings below Ú page 199. Commercial Settings allows you to access the
following features (if equipped):
Power Take Off (PTO)
Remote Ignition
Idle Control
Backup Alarm
ParkSense
Aux Switches
PIN Setup
NOTE:If the vehicle’s PIN is forgotten or not known, see
an authorized dealer to have the PIN reset.
DIESEL MESSAGES AND WARNINGS
Diesel Particulate Filter (DPF) Messages
The Cummins® diesel engine meets all diesel
emissions standards, resulting in one of the lowest
emitting diesel engines ever produced. To achieve
these emissions standards, your vehicle is
equipped with a state-of-the-art engine and
exhaust system. These systems are seamlessly
integrated into your vehicle and managed by the
Powertrain Control Module (PCM). The PCM
manages engine combustion to allow the exhaust
system’s catalyst to trap and burn Particulate
Matter (PM) pollutants, with no input or interaction
on your part.
Your vehicle has the ability to alert you to
additional maintenance required on your vehicle or
engine. The following messages may display in
your instrument cluster display:
Perform Service
— Your vehicle will require emis -
sions maintenance at a set interval. To help
remind you when this maintenance is due, the
instrument cluster display will display “Perform
Service”. When the “Perform Service” message
is displayed in the instrument cluster display it is
necessary to have the emissions maintenance
performed. Emissions maintenance may
include replacing the Closed Crankcase Ventila -
tion (CCV) filter element. The procedure for
clearing and resetting the "Perform Service"
indicator message is located in the appropriate
Service Information.
Favorite Menus
Trip Info Navigation Off Road
Trailer Tow –
If Equipped
(show/hide) Audio (show/
hide)
WARNING!
A hot exhaust system can start a fire if you park
over materials that can burn. Such materials
might be grass or leaves coming into contact
with your exhaust system. Do not park or
operate your vehicle in areas where your
exhaust system can contact anything that can
burn.

23_DPF_OM_EN_USC_t.book Page 98

GETTING TO KNOW YOUR INSTRUMENT PANEL99
Exhaust System — Regeneration Required
Now — "Exhaust Filter XX% Full Safely Drive at
Highway Speeds to Remedy" will be displayed in
the instrument cluster display if the exhaust
particulate filter reaches 80% of its maximum
storage capacity. Under conditions of exclusive
short duration and low speed driving cycles,
your Cummins® diesel engine and exhaust
after-treatment system may never reach the
conditions required to remove the trapped PM.
If this occurs, the “Exhaust Filter XX% Full Safely
Drive at Highway Speeds to Remedy” message
will be displayed in the instrument cluster
display. If this message is displayed, you will
hear one chime to assist in alerting you of this
condition
By simply driving your vehicle at highway speeds
for as little as 45 minutes, you can remedy the
condition in the particulate filter system and
allow your Cummins® diesel engine and
exhaust after-treatment system to remove the
trapped PM and restore the system to normal
operating condition.
Exhaust System — Regeneration In Process
Exhaust Filter XX% Full — Indicates that the DPF
is self-cleaning. Maintain your current driving
condition until regeneration is completed.
Exhaust System — Regeneration Completed —
This message indicates that the DPF
self-cleaning is completed. If this message is
displayed, you will hear one chime to assist in
alerting you of this condition.
Exhaust Service Required — See Dealer Now —
This message indicates regeneration has been
disabled due to a system malfunction. At this
point the engine Powertrain Control Module
(PCM) will register a fault code, the instrument
panel will display a MIL light.
Exhaust Filter Full — Power Reduced See
Dealer — This message indicates the PCM has
derated the engine to limit the likelihood of
permanent damage to the after-treatment
system. If this condition is not corrected and a
dealer service is not performed, extensive
exhaust after-treatment damage can occur. To
correct this condition it will be necessary to have
your vehicle serviced by an authorized dealer.
NOTE:Failing to follow the oil change indicator, changing
your oil and resetting the oil change indicator by
0 miles remaining will prevent the diesel exhaust
filter from performing it's cleaning routine. This will
shortly result in a Malfunction Indicator Light (MIL)
and reduced engine power. Only an authorized
dealer will be able to correct this condition.
Cold Ambient Derate Mode Messages
The vehicle will display messages when a derate
(engine power reduction) is activated to protect the
engine during start-up in cold ambient
temperatures.
Engine Power Reduced During Warm-up — This
message will display during start-up when the
ambient temperature is between 10°F (-12°C)
and -10°F (-23°C).
Engine Power Reduced Up To 30 Sec (Seconds)
During Warm-up — This message will display
during start-up when the ambient temperature
is between -10°F (-23°C) and -25°F (-32°C).
CAUTION!
See an authorized dealer, as damage to the
exhaust system could occur soon with continued
operation.
CAUTION!
See an authorized dealer, as damage to the
exhaust system could occur soon with continued
operation.
3

23_DPF_OM_EN_USC_t.book Page 99

STARTING AND OPERATING119
3. While the Wait To Start Indicator Light is on, the instrument cluster will additionally display
a gauge or bar whose initial length represents
the full "Wait to Start" time period. Its length
will decrease until it disappears when the
"Wait to Start" time has elapsed.
4. After the engine Wait To Start Indicator Light goes off, the engine will automatically crank.
5. After engine start-up, check to see that there is oil pressure.
6. Release the parking brake and drive.
NOTE:
Engine idle speed will automatically increase to
1,000 RPM and engage the Variable Geometry
Turbocharger at low coolant temperatures to
improve engine warm-up.
The engine will not automatically crank after the
engine Wait To Start Indicator Light goes off if a
door or the hood is ajar.
If the engine stalls, or if the ignition switch is left
ON for more than two minutes after the Wait To
Start Indicator Light goes out, reset the intake
air heater by turning the ignition switch to the
OFF position for at least 5 seconds and then
back ON. Repeat steps 1 through 6 of “Keyless
Enter ‘n Go™ Starting Procedure – Engine Mani -
fold Air Temperature 0°F To 66°F (–18°C to
19°C).”
EXTREME COLD WEATHER
The Cummins® Turbo Diesel engine is equipped
with several features designed to assist cold
weather starting and operation:
The engine block heater is a resistance heater
installed in the water jacket of the engine just
above and behind the oil filter. It requires a
110–115 Volt AC electrical outlet with a
grounded, three-wire extension cord.
NOTE:The engine block heater cord is a factory installed
option. If your vehicle is not equipped, heater cords
are available from an authorized Mopar® dealer.
A 12 Volt heater built into the fuel filter housings
aid in preventing fuel gelling. It is controlled by a
built-in thermostat.
An intake air heater system both improves
engine starting and reduces the amount of
white smoke generated by a warming engine.
NORMAL STARTING PROCEDURE —
E
NGINE MANIFOLD AIR TEMPERATURE
A
BOVE 66°F (19°C)
Observe the instrument panel cluster lights when
starting the engine.

1. Always apply the parking brake.

2. Shift into PARK for an automatic transmission.
3. Place the ignition switch in the ON/RUN
position and watch the instrument panel
cluster lights.
CAUTION!
If the Water in Fuel Indicator Light remains on,
DO NOT START the engine before you drain the
water from the fuel filters to avoid engine
damage Ú page 360.
CAUTION!
Do not crank engine for more than 25 seconds
at a time or starter motor damage may result.
Turn the ignition switch to the OFF position and
wait at least two minutes for the starter to cool
before repeating start procedure.
CAUTION!
If the Water in Fuel Indicator Light remains on,
DO NOT START the engine before you drain the
water from the fuel filters to avoid engine
damage Úpage 360.
4

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120STARTING AND OPERATING
4. Place the ignition switch in the START position and crank the engine. Do not press the
accelerator during starting.
5. Check that the Oil Pressure Warning Light has turned off.
6. Release the parking brake.
STARTING PROCEDURE — ENGINE
M
ANIFOLD AIR TEMPERATURE 0°F TO
66°F (–18°C
TO 19°C)
NOTE:The temperature displayed in the instrument
cluster does not necessarily reflect the engine
manifold air temperature Ú page 89. When
engine temperatures fall below 66°F (19°C) the
Wait To Start Indicator Light will remain on indi -
cating the intake air heater system is active. Follow the steps in the “Normal Starting”
procedure except:

1. The Wait To Start Indicator Light will remain
on for a period of time that varies depending
on the engine temperature.

2. While the Wait To Start Indicator Light is on, the instrument cluster will additionally display
a gauge or bar whose initial length represents
the full “Wait to Start” time period. Its length
will decrease until it disappears when the
“Wait to Start” time has elapsed.
3. After the Wait To Start Indicator Light goes off, place the ignition switch in the START position.
Do not press the accelerator during starting. 4. After engine start-up, check that the Oil
Pressure Warning Light has turned off.
5. Release the parking brake and drive.
NOTE:
Engine idle speed will automatically increase to
1,000 RPM and engage the Variable Geometry
Turbocharger at low coolant temperatures to
improve engine warm-up.
Automatic equipped vehicles with optional
Keyless Enter ‘n Go™ – If the ENGINE START/
STOP button is pushed once while in PARK with
the ignition off and driver’s foot on the brake
pedal, the vehicle will automatically crank and
start after the “Wait to Start” time has elapsed.
If it is desired to abort the start process before it
completes, the driver’s foot should be fully
removed from the brake pedal prior to pushing
the start button again in order for the ignition to
move directly to off.
If the engine stalls, or if the ignition switch is left
on for more than two minutes after the Wait To
Start Indicator Light goes out, reset the intake
air heater by turning the ignition switch to the
OFF position for at least five seconds and then
back to the ON/RUN position. Repeat steps 1
through 5 of “Starting Procedure – Engine Mani -
fold Air Temperature 0°F To 66°F (–18°C to
19°C).”
CAUTION!
Do not crank engine for more than 25 seconds
at a time or starter motor damage may result.
Turn the ignition switch to the OFF position and
wait at least two minutes for the starter to cool
before repeating start procedure.
CAUTION!
If the Water in Fuel Indicator Light remains on,
DO NOT START the engine before you drain the
water from the fuel filters to avoid engine
damage Ú page 360.
CAUTION!
Do not crank engine for more than 25 seconds
at a time or starter motor damage may result.
Turn the ignition switch to the OFF position and
wait at least two minutes for the starter to cool
before repeating start procedure.

23_DPF_OM_EN_USC_t.book Page 120

STARTING AND OPERATING121
(Continued)
STARTING PROCEDURE — ENGINE
M
ANIFOLD AIR TEMPERATURE BELOW
0°F (-18°C)
In extremely cold weather below 0°F (-18°C) it
may be beneficial to cycle the intake air heater
twice before attempting to start the engine. This
can be accomplished by turning the ignition to OFF
position for at least five seconds and then back to
the ON/RUN position after the Wait To Start
Indicator Light has turned off, but before the
engine is started. However, excessive cycling of the
intake air heater will result in damage to the heater
elements or reduced battery voltage.
NOTE:If multiple pre-heat cycles are used before starting,
additional engine run time may be required to
maintain battery state of charge at a satisfactory
level.

1. If the engine stalls after the initial start, the
ignition must be turned to the OFF position for
at least five seconds and then to the ON/RUN
position to recycle the intake air heater.

NOTE:Excessive white smoke and poor engine perfor -
mance will result if intake air heater is not recycled.
2. Heat generated by the intake air heater dissipates rapidly in a cold engine. If more than
two minutes pass between the time the Wait To Start Indicator Light turns off and the
engine is started, recycle the intake air heater
by turning the ignition switch to the OFF
position for at least five seconds and then
back to the ON/RUN position.
3. If the vehicle is driven and vehicle speed exceeds 19 mph (31 km/h) before the intake
air heater post-heat (after start) cycle is
complete, the intake air heater will shut off.
4. If the engine is cranked for more than 10 seconds, the post-heat cycle will turn off.
NOTE:
Engine idle speed will automatically increase to
1,000 RPM and engage the Variable Geometry
Turbocharger at low coolant temperatures to
improve engine warm-up.
When a diesel engine is allowed to run out of
fuel or the fuel gels at low temperatures, air is
pulled into the fuel system. If your engine has
run out of fuel Ú page 363.
If the engine stalls, or if the ignition switch is left
on for more than two minutes after the Wait To
Start Indicator Light goes out, reset the intake
air heater by turning the ignition switch to the
OFF position for at least five seconds and then
back to the ON/RUN position. Repeat steps 1
through 5 of “Starting Procedure – Engine Mani -
fold Air Temperature 0°F to 60°F (-18°C to
19°C).”
STARTING FLUIDS
The engine is equipped with an automatic electric
air preheating system. If the instructions in this
manual are followed, the engine should start in all
conditions.
WARNING!
Starting fluids or flammable liquids must never
be used in the Cummins® diesel engine (see
Warning label). Never pour diesel fuel,
flammable liquid, starting fluids (ether) into the
air cleaner canister, air intake piping, or
turbocharger inlet in an attempt to start the
vehicle. This could result in a flash fire and
explosion causing serious personal injury and
engine damage.
WARNING!
Do not leave children or animals inside parked
vehicles in hot weather. Interior heat build-up
may cause serious injury or death.
When leaving the vehicle, always remove the
key fob and lock your vehicle.
4

23_DPF_OM_EN_USC_t.book Page 121

STARTING AND OPERATING131
IGNITION PARK INTERLOCK
This vehicle is equipped with an Ignition Park
Interlock which requires the transmission to be in
PARK before the ignition can be turned to the OFF
position. This helps the driver avoid inadvertently
leaving the vehicle without placing the
transmission in PARK. This system also locks the
transmission in PARK whenever the ignition is in
the OFF position.
NOTE:The transmission is NOT locked in PARK when the
ignition is in the ACC position (even though the
engine will be off). Ensure that the transmission is
in PARK, and the ignition is OFF (not in ACC
position) before exiting the vehicle.
BRAKE/TRANSMISSION SHIFT
I
NTERLOCK (BTSI) SYSTEM
This vehicle is equipped with a BTSI system that
holds the transmission gear selector in PARK
unless the brakes are applied. For vehicles with
8-speed transmission, to shift the transmission out
of PARK, the engine must be running and the brake
pedal must be pressed. The brake pedal must also
be pressed to shift from NEUTRAL into DRIVE or
REVERSE when the vehicle is stopped or moving at
low speeds. For vehicles with 6-speed
transmission, to shift the transmission out of
PARK, the ignition must be in the ON/RUN position
(engine running or not) and the brake pedal must
be pressed.
The BTSI will timeout if brake pedal is pressed for
three minutes or longer continuously while in park.
It can be reset by releasing the brake for more then
three seconds, then reapplying the brake pedal or
cycling the ignition.Never use the PARK position as a substitute
for the parking brake. Always apply the
parking brake fully when exiting the vehicle to
guard against vehicle movement and possible
injury or damage.
Your vehicle could move and injure you and
others if it is not in PARK. Check by trying to
move the gear selector out of PARK with the
brake pedal released. Make sure the trans -
mission is in PARK before exiting the vehicle.
Never leave children alone in a vehicle, or with
access to an unlocked vehicle. Allowing chil -
dren to be in a vehicle unattended is
dangerous for a number of reasons. A child or
others could be seriously or fatally injured.
Children should be warned not to touch the
parking brake, brake pedal or the transmis -
sion gear selector.
Do not leave the key fob in or near the vehicle
(or in a location accessible to children), and do
not leave the ignition (in a vehicle equipped
with Keyless Enter ‘n Go™) in the ACC or ON/
RUN position. A child could operate power
windows, other controls, or move the vehicle.
WARNING!CAUTION!
Shift into or out of PARK or REVERSE only after
the vehicle has come to a complete stop.
Do not shift between PARK, REVERSE,
NEUTRAL, or DRIVE when the engine is above
idle speed.
Before shifting into any gear, make sure your
foot is firmly pressing the brake pedal.
4

23_DPF_OM_EN_USC_t.book Page 131

STARTING AND OPERATING133
The following indicators should be used to ensure
that you have properly engaged the transmission
into the PARK position:
Look at the transmission gear position display
and verify that it indicates the PARK position (P),
and is not blinking.
With the brake pedal released, verify that the
gear selector will not move out of PARK.
REVERSE (R)
This range is for moving the vehicle backward.
Shift into REVERSE only after the vehicle has come
to a complete stop.
NEUTRAL (N)
Use this range when the vehicle is standing for
prolonged periods with the engine running. Apply
the parking brake and shift the transmission into
PARK if you must exit the vehicle. DRIVE (D)
This range should be used for most city and
highway driving. It provides the smoothest upshifts
and downshifts, and the best fuel economy. The
transmission automatically upshifts through all
forward gears.
When frequent transmission shifting occurs (such
as when operating the vehicle under heavy loading
conditions, in hilly terrain, traveling into strong
head winds, or while towing a heavy trailer), select
TOW/HAUL mode or use the Electronic Range
Select (ERS) shift control to select a lower gear
range
Úpage 134. Under these conditions, using
a lower gear range will improve performance and extend transmission life by reducing excessive
shifting and heat build-up.
During extremely cold temperatures (-22°F
[-30°C] or below), transmission operation may be
modified depending on engine and transmission
temperature as well as vehicle speed. Normal
operation will resume once the transmission
temperature has risen to a suitable level.
Transmission Limp Home Mode
Transmission function is monitored electronically
for abnormal conditions. If a condition is detected
that could result in transmission damage,
Transmission Limp Home Mode is activated. In this
mode, the transmission may operate only in
certain gears, or may not shift at all. Vehicle
performance may be severely degraded and the
engine may stall. In some situations, the
transmission may not re-engage if the engine is
turned off and restarted. The Malfunction Indicator
Light (MIL) may be illuminated. A message in the
instrument cluster will inform the driver of the
more serious conditions, and indicate what actions
may be necessary.
In the event of a momentary problem, the
transmission can be reset to regain all forward
gears by performing the following steps:
NOTE:In cases where the instrument cluster message
indicates the transmission may not re-engage after
CAUTION!
DO NOT race the engine when shifting from
PARK or NEUTRAL into another gear range, as
this can damage the drivetrain.
Before moving the transmission gear selector
out of PARK, you must start the engine, and
also press the brake pedal. Otherwise,
damage to the gear selector could result.
WARNING!
Do not coast in NEUTRAL and never turn off the
ignition to coast down a hill. These are unsafe
practices that limit your response to changing
traffic or road conditions. You might lose control
of the vehicle and have a collision.
CAUTION!
Towing the vehicle, coasting, or driving for any
other reason with the transmission in NEUTRAL
can cause severe transmission damage.
For Towing A Disabled Vehicle Ú
page 339.
For Recreational Towing Ú page 195.4

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134STARTING AND OPERATING
engine shutdown, perform this procedure only in a
desired location (preferably, at an authorized
dealer).

1. Stop the vehicle.

2. Shift the transmission into PARK, if possible. If not, shift the transmission to NEUTRAL.
3. Push and hold the ignition switch until the engine turns off.
4. Wait approximately 30 seconds.
5. Restart the engine.
6. Shift into the desired gear range. If the problem is no longer detected, the
transmission will return to normal operation.
NOTE:Even if the transmission can be reset, we
recommend that you visit an authorized dealer at
your earliest possible convenience. An authorized
dealer has diagnostic equipment to assess the
condition of your transmission.
If the transmission cannot be reset, authorized
dealer service is required.
Electronic Range Select (ERS) Operation
The ERS shift control allows the driver to limit the
highest available gear when the transmission is in
DRIVE. For example, if you set the transmission
gear limit to FOURTH gear, the transmission will not shift above FOURTH gear (except to prevent
engine overspeed), but will shift through the lower
gears normally.
You can switch between DRIVE and ERS mode at
any vehicle speed. When the transmission gear
selector is in DRIVE, the transmission will operate
automatically, shifting between all available gears.
Tapping the GEAR “–” switch (on the steering
wheel) 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
the GEAR “–” or GEAR “+” switch will change the
top available gear.

ERS Control
To exit ERS mode, simply push and hold the
GEAR “+” switch until the gear limit display
disappears from the instrument cluster.
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.

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.

23_DPF_OM_EN_USC_t.book Page 134

STARTING AND OPERATING137
If the transmission temperature exceeds normal
operating limits, the powertrain controller will
modify the transmission shift schedule and expand
the range of torque converter clutch engagement.
This is done to prevent transmission damage due
to overheating.
If the transmission becomes extremely hot or is in
danger of overheating, the Transmission
Temperature Warning Light may illuminate and the
transmission may operate differently until the
transmission cools down.
NOTE:Use caution when operating a heavily loaded
vehicle at low speeds (such as towing a trailer up a
steep grade, or in stop-and-go traffic) during hot
weather. In these conditions, torque converter slip
can impose a significant additional heat load on
the cooling system. Downshifting the transmission
to the lowest possible gear (when climbing a
grade), or shifting to NEUTRAL (when stopped in
heavy traffic) can help to reduce this excess heat
generation.
During cold temperatures, transmission operation
may be modified depending on engine and
transmission temperature as well as vehicle
speed. This feature improves warm-up time of the
engine and transmission to achieve maximum
efficiency. Engagement of the torque converter
clutch is inhibited until the transmission fluid is
warm Ú page 139. On trucks with AS66RC or AS69RC transmission,
FIFTH and SIXTH gears may be inhibited briefly on
cold starts below 41°F (5°C), and during very cold
temperatures (-4°F [-20°C] or below), operation
may briefly be limited to third gear only. During this
condition, the ability of the vehicle to accelerate
under heavily loaded conditions may be reduced.
In all cases, normal operation will resume once the
transmission temperature has risen to a suitable
level.
Transmission Limp Home Mode
Transmission function is monitored electronically
for abnormal conditions. If a condition is detected
that could result in transmission damage,
Transmission Limp Home Mode is activated. In this
mode, the transmission remains in THIRD gear
regardless of which forward gear is selected. If an
AS66RC/AS69RC equipped truck enters
Transmission Limp Home Mode at highway
speeds, it will initially engage FIFTH gear, until the
vehicle slows to a speed where THIRD gear can be
engaged. PARK, REVERSE, and NEUTRAL will
continue to operate. The Malfunction Indicator
Light (MIL) may be illuminated. Transmission Limp
Home Mode allows the vehicle to be driven to an
authorized dealer for service without damaging the
transmission.
In the event of a momentary problem, the
transmission can be reset to regain all forward
gears by performing the following steps:

1. Stop the vehicle.

2. Shift the transmission into PARK.
3. Turn the ignition to the OFF position.
4. Wait approximately 10 seconds.
5. Restart the engine.
6. Shift into the desired gear range. If the
problem is no longer detected, the
transmission will return to normal operation.
NOTE:Even if the transmission can be reset, we
recommend that you visit an authorized dealer at
your earliest possible convenience. An authorized
dealer has diagnostic equipment to assess the
condition of your transmission.
If the transmission cannot be reset, authorized
dealer service is required.
Electronic Range Select (ERS) Operation
The ERS shift control allows the driver to limit the
highest available gear when the transmission is in
DRIVE. For example, if you set the transmission
gear limit to FOURTH gear, the transmission will
not shift above FOURTH gear, but will shift through
the lower gears normally.
4

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