light RAM 1500 2023 Repair Manual

116GETTING TO KNOW YOUR INSTRUMENT PANEL
LaneSense Indicator Light — If Equipped
When the LaneSense system is ON, but not
armed, the LaneSense indicator light
illuminates solid white. This occurs when only
left, right, or neither lane line has been
detected. If a single lane line is detected, the system is
ready to provide only visual warnings if an unintentional
lane departure occurs on the detected lane line
Úpage 161.
Cruise Control SET Indicator Light —
If Equipped With Base/Midline Instrument
Cluster Display
This light will turn on when the cruise control is
set Úpage 143.
BLUE INDICATOR LIGHTS
High Beam Indicator Light
This indicator light will illuminate to indicate
that the high beam headlights are on. With the
low beams activated, push the multifunction
lever forward (toward the front of the vehicle) to
turn on the high beams. Pull the multifunction lever
rearward (toward the rear of the vehicle) to turn off the
high beams. If the high beams are off, pull the lever toward
you for a temporary high beam on, “flash to pass”
scenario.
ONBOARD DIAGNOSTIC SYSTEM — OBD II
Your vehicle is equipped with a sophisticated Onboard
Diagnostic system called OBD II. This system monitors the
performance of the emissions, engine, and transmission
control systems. When these systems are operating
properly, your vehicle will provide excellent performance
and fuel economy, as well as engine emissions well within
current government regulations.
If any of these systems require service, the OBD II system
will turn on the Malfunction Indicator Light (MIL). It will
also store diagnostic codes and other information to
assist your service technician in making repairs. Although
your vehicle will usually be drivable and not need towing,
see an authorized dealer for service as soon as possible.
ONBOARD DIAGNOSTIC SYSTEM
(OBD II) C
YBERSECURITY
Your vehicle is required to have OBD II and a connection
port to allow access to information related to the
performance of your emissions controls. Authorized
service technicians may need to access this information to
assist with the diagnosis and service of your vehicle and
emissions system
Úpage 191.
CAUTION!
 Prolonged driving with the MIL on could cause further
damage to the emission control system. It could also
affect fuel economy and driveability. The vehicle
must be serviced before any emissions tests can be
performed.
 If the MIL is flashing while the vehicle is running,
severe catalytic converter damage and power loss
will soon occur. Immediate service is required.
WARNING!
ONLY an authorized service technician should
connect equipment to the OBD II connection port in
order to read the VIN, diagnose, or service your
vehicle.
 If unauthorized equipment is connected to the OBD II
connection port, such as a driver-behavior tracking
device, it may:
 Be possible that vehicle systems, including
safety related systems, could be impaired or a
loss of vehicle control could occur that may
result in an accident involving serious injury or
death.
 Access, or allow others to access, information
stored in your vehicle systems, including
personal information.

23_DT_OM_EN_USC_t.book Page 116

GETTING TO KNOW YOUR INSTRUMENT PANEL117
EMISSIONS INSPECTION AND
MAINTENANCE PROGRAMS
In some localities, it may be a legal requirement to pass an
inspection of your vehicle's emissions control system.
Failure to pass could prevent vehicle registration.
For states that require an Inspection and
Maintenance (I/M), this check verifies the
Malfunction Indicator Light (MIL) is functioning
and is not on when the engine is running, and
that the OBD II system is ready for testing.
Normally, the OBD II system will be ready. The OBD II
system may not be ready if your vehicle was recently
serviced, recently had a depleted battery or a battery
replacement. If the OBD II system should be determined
not ready for the I/M test, your vehicle may fail the test. Your vehicle has a simple ignition actuated test, which you
can use prior to going to the test station. To check if your
vehicle's OBD II system is ready, you must do the following:

1. Cycle the ignition switch to the ON position, but do
not crank or start the engine.

NOTE:If you crank or start the engine, you will have to start this
test over.
2. As soon as you cycle the ignition switch to the ON position, you will see the Malfunction Indicator Light
(MIL) symbol come on as part of a normal bulb check.
3. Approximately 15 seconds later, one of two things will happen:
 The MIL will flash for about 10 seconds and then
return to being fully illuminated until you turn OFF
the ignition or start the engine. This means that
your vehicle's OBD II system is not ready and you
should not proceed to the I/M station.
 The MIL will not flash at all and will remain fully illu -
minated until you place the ignition in the off posi -
tion or start the engine. This means that your
vehicle's OBD II system is ready and you can
proceed to the I/M station. If your OBD II system is
not ready, you should see an
authorized dealer or repair facility. If your vehicle was
recently serviced or had a battery failure or replacement,
you may need to do nothing more than drive your vehicle
as you normally would in order for your OBD II system to
update. A recheck with the approved test routine may then
indicate that the system is now ready.
Regardless of whether your vehicle's OBD II system is
ready or not, if the MIL is illuminated during normal vehicle
operation you should have your vehicle serviced before
going to the I/M station. The I/M station can fail your
vehicle because the MIL is on with the engine running.
3

23_DT_OM_EN_USC_t.book Page 117

122STARTING AND OPERATING
ENGINE BREAK-IN RECOMMENDATIONS
A long break-in period is not required for the engine and
drivetrain (transmission and axle) in your vehicle.
Drive moderately during the first 300 miles (500 km).
After the initial 60 miles (100 km), speeds up to 50 or
55 mph (80 or 90 km/h) are desirable.
While cruising, brief full-throttle acceleration within the
limits of local traffic laws contributes to a good break-in.
Wide-open throttle acceleration in low gear can be
detrimental and should be avoided.
The engine oil installed in the engine at the factory is a
high-quality energy conserving type lubricant. Oil changes
should be consistent with anticipated climate conditions
under which vehicle operations will occur. For the
recommended viscosity and quality grades
Úpage 396.
NOTE:A new engine may consume some oil during its first few
thousand miles (kilometers) of operation. This should be
considered a normal part of the break-in and not inter -
preted as a problem. Please check your oil level with the
engine oil indicator often during the break-in period. Add
oil as required.
PARKING BRAKE
ELECTRIC PARK BRAKE (EPB)
Your vehicle is equipped with an EPB that offers simple
operation, and some additional features that make the
parking brake more convenient and useful.
The parking brake is primarily intended to prevent the
vehicle from rolling while parked. Before leaving the
vehicle, make sure that the parking brake is applied. Also,
be certain to leave the transmission in PARK.
You can engage the parking brake in two ways:
 Manually, by applying the parking brake switch.
 Automatically, by enabling the Auto Park Brake feature
in the Customer Programmable Features section of the
Uconnect settings.
The parking brake switch is located on the instrument
panel to the left of the steering wheel (below the
headlamp switch).

Electric Park Brake Switch

To apply the parking brake manually, pull up on the switch
momentarily. You may hear a slight sound from the back
of the vehicle while the parking brake engages. Once the
park brake is fully engaged, the BRAKE telltale light in the
instrument cluster and an indicator on the switch will
illuminate. If your foot is on the brake pedal while you
apply the parking brake, you may notice a small amount of
brake pedal movement. The parking brake can be applied
even when the ignition switch is OFF but the BRAKE
telltale light will not illuminate, however, it can only be
released when the ignition is in the ON/RUN position.
NOTE:The EPB Warning Light will illuminate if the EPB switch is
held for longer than 20 seconds in either the released or
applied position. The light will extinguish upon releasing
the switch.
If the Auto Park Brake feature is enabled, the parking
brake will automatically engage whenever the
transmission is placed into PARK. If your foot is on the
brake pedal, you may notice a small amount of brake
pedal movement while the parking brake is engaging.
The parking brake will release automatically when the
ignition is ON, the transmission is in DRIVE or REVERSE,
the driver seat belt is buckled, and an attempt is made to
drive away.
To release the parking brake manually, the ignition switch
must be in the ON/RUN position. Put your foot on the
brake pedal, then push the parking brake switch down
momentarily. You may hear a slight whirring sound from
the back of the vehicle while the parking brake
disengages.
CAUTION!
Never use Non-Detergent Oil or Straight Mineral Oil in
the engine or damage may result.

23_DT_OM_EN_USC_t.book Page 122

STARTING AND OPERATING123
(Continued)
You may also notice a small amount of movement in the
brake pedal. Once the parking brake is fully disengaged,
the BRAKE telltale light in the instrument cluster and the
LED indicator on the switch will extinguish.
NOTE:When parking on a hill, it is important to turn the front
wheels toward the curb on a downhill grade and away from
the curb on an uphill grade. Apply the parking brake before
placing the gear selector in PARK, otherwise the load on
the transmission locking mechanism may make it difficult
to move the gear selector out of PARK.
If exceptional circumstances should make it necessary to
engage the parking brake while the vehicle is in motion,
maintain upward pressure on the EPB switch for as long as
engagement is desired. The BRAKE telltale light will
illuminate, and a continuous chime will sound. The rear
stop lamps will also be illuminated automatically while the
vehicle remains in motion.To disengage the parking brake while the vehicle is in
motion, release the switch. If the vehicle is brought to a
complete stop using the parking brake, when the vehicle
reaches approximately 3 mph, (5 km/h) the parking brake
will remain engaged.
In the unlikely event of a malfunction of the EPB system, a
yellow EPB Warning Light will illuminate. This may be
accompanied by the BRAKE telltale light flashing. In this
event, urgent service of the EPB system is required. Do not
rely on the parking brake to hold the vehicle stationary.
Auto Park Brake
The Electric Park Brake (EPB) can be programmed to be
applied automatically whenever the vehicle is at a
standstill and the automatic transmission is placed in
PARK. Auto Park Brake is enabled and disabled by
customer selection through the Customer Programmable
Features section of the Uconnect Settings
Úpage 206.
Any single Auto Park Brake application can be bypassed by
pushing the EPB switch to the release position while the
transmission is placed in PARK.
WARNING!
 Never use the PARK position as a substitute for the
parking brake. Always apply the parking brake fully
when parked to guard against vehicle movement and
possible injury or damage.
 When exiting the vehicle, always remove the key fob
from the ignition and lock your vehicle.
 Never leave children alone in a vehicle, or with
access to an unlocked vehicle. Allowing children to
be in a vehicle unattended is dangerous for a
number of reasons. A child or others could be seri -
ously or fatally injured. Children should be warned
not to touch the parking brake, brake pedal or the
gear selector.
 Do not leave the key fob in or near the vehicle, or in
a location accessible to children, and do not leave 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.
 Be sure the parking brake is fully disengaged before
driving; failure to do so can lead to brake failure and
a collision.
 Always fully apply the parking brake when leaving
your vehicle, or it may roll and cause damage or
injury. Also be certain to leave the transmission in
PARK. Failure to do so may allow the vehicle to roll
and cause damage or injury.
CAUTION!
If the Brake System Warning Light remains on with the
parking brake released, a brake system malfunction is
indicated. Have the brake system serviced by an
authorized dealer immediately.
WARNING!
WARNING!
Driving the vehicle with the parking brake engaged, or
repeated use of the parking brake to slow the vehicle,
may cause serious damage to the brake system.
Be sure the parking brake is fully disengaged before
driving; failure to do so can lead to brake failure and a
collision.
4

23_DT_OM_EN_USC_t.book Page 123

124STARTING AND OPERATING
(Continued)
SafeHold
SafeHold is a safety feature of the Electric Park Brake
(EPB) system that will engage the parking brake
automatically if the vehicle is left unsecured while the
ignition is in ON/RUN.
The parking brake will automatically engage if all of the
following conditions are met:
The vehicle is at a standstill.
 There is no attempt to press the brake pedal and accel -
erator pedal.
 The seat belt is unbuckled.
 The driver door is open.
SafeHold can be temporarily bypassed by pushing the EPB
switch while the driver door is open. Once manually
bypassed, SafeHold will be enabled again once the vehicle
reaches 12 mph (20 km/h) or the ignition is turned to the
OFF position and back to ON again.
Brake Service Mode
We recommend having your brakes serviced by an
authorized dealer. You should only make repairs for which
you have the knowledge and the right equipment.
You should only enter Brake Service mode during
brake service. When servicing your rear brakes, it may be necessary for
you or your technician to push the rear piston into the rear
caliper bore. With the Electric Park Brake (EPB) system,
this can only be done after retracting the EPB actuator.
Fortunately, actuator retraction can be done easily by
entering the Brake Service mode through the Uconnect
Settings in your vehicle. This menu-based system will
guide you through the steps necessary to retract the EPB
actuator in order to perform rear brake service.
Service Mode has requirements that must be met in order
to be activated:

The vehicle must be at a standstill.
 The parking brake must be unapplied.
 The transmission must be in PARK or NEUTRAL.
While in Service Mode, the EPB Warning Light will flash
continuously while the ignition is in ON/RUN.
When brake service work is complete, the following steps
must be followed to reset the park brake system to normal
operation:
 Ensure the vehicle is at a standstill.
 Press the brake pedal with moderate force.
 Apply the EPB Switch.
AUTOMATIC TRANSMISSION
You must press and hold the brake pedal while shifting out
of PARK.
WARNING!
You can be badly injured working on or around a motor
vehicle. Do only that service work for which you have
the knowledge and the right equipment. If you have any
doubt about your ability to perform a service job, take
your vehicle to a competent mechanic.
WARNING!
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 trans -
mission gear selector out of PARK with the brake
pedal released. Make sure the transmission is in
PARK before exiting the vehicle.
 The transmission may not engage PARK if the vehicle
is moving. Always bring the vehicle to a complete
stop before shifting to PARK, and verify that the
transmission gear position indicator solidly indicates
PARK (P) without blinking. Ensure that the vehicle is
completely stopped, and the PARK position is prop -
erly indicated, before exiting the vehicle.
 It is dangerous to shift out of PARK or NEUTRAL if the
engine speed is higher than idle speed. If your foot is
not firmly pressing the brake pedal, the vehicle could
accelerate quickly forward or in reverse. You could
lose control of the vehicle and hit someone or
something. Only shift into gear when the engine is
idling normally and your foot is firmly pressing the
brake pedal.

23_DT_OM_EN_USC_t.book Page 124

128STARTING AND OPERATING
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 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, an authorized dealer
service is required.
Electronic Range Select (ERS) Operation —
If Equipped
The ERS shift control allows the driver to limit the highest
available gear when the transmission is in DRIVE and ERS
mode is not active. For example, if you set the
transmission gear limit to FOURTH gear, the transmission
will hold that gear and not shift above FOURTH gear, but
will shift through the lower gears normally.
NOTE:ERS will only upshift during a FIRST to SECOND gear shift
when in 4WD LOW. All other ranges will hold the gear.
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 “-” button
(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 “-”
or “+” button will change the top available gear.

Electronic Range Select (ERS)

To exit ERS mode, simply push and hold the “+” button
until the gear limit display disappears from the instrument
cluster.1 — Shift Up “+”
2 — Shift Down “–”
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_DT_OM_EN_USC_t.book Page 128

130STARTING AND OPERATING
When to Use TOW/HAUL Mode
Select TOW/HAUL mode when driving in conditions such
as: driving in hilly areas, towing a trailer, carrying a heavy
load, etc. This mode will improve performance and reduce
the potential for transmission overheating or failure due to
excessive shifting.

TOW/HAUL Switch

The TOW/HAUL Indicator Light will illuminate in the
instrument cluster to indicate that TOW/HAUL mode has
been activated. Pushing the switch a second time restores
normal operation. Normal operation is always the default
at engine start-up. If TOW/HAUL mode is desired, the
switch must be pushed each time the engine is started.
FOUR-WHEEL DRIVE OPERATION —
IF EQUIPPED
FOUR-POSITION ELECTRONICALLY
S
HIFTED TRANSFER CASE —
I
F EQUIPPED
This is an electronic shift transfer case and is operated by
the 4WD Control Switch (Transfer Case Switch), located on
the instrument panel.

Four-Position/On-Demand Transfer Case

This electronically shifted transfer case provides four
positions:
 Two-Wheel Drive High Range (2WD) — This range is for
normal street and highway driving on dry hard surfaced
roads. Driving the vehicle in 2WD will have greater fuel
economy benefits as the front axle is not engaged in
2WD.
 Four-Wheel Drive High Range (4WD HIGH) — This range
provides torque to the front driveshaft (engages
four-wheel drive) which allows front and rear wheels to
spin at the same speed. This provides additional
traction for loose or slippery road surfaces only.
WARNING!
Do not use the TOW/HAUL feature when driving in icy or
slippery conditions. The increased engine braking can
cause the rear wheels to slide, and the vehicle to swing
around with the possible loss of vehicle control, which
may cause an accident possibly resulting in personal
injury or death.

23_DT_OM_EN_USC_t.book Page 130

STARTING AND OPERATING131
Four-Wheel Drive Low Range (4WD LOW) — This range
provides low speed four-wheel drive. It maximizes
torque (increased torque over 4WD HIGH) to the front
driveshaft; allowing front and rear wheels to rotate at
the same speed. This range provides additional trac -
tion and maximum pulling power for loose or slippery
road surfaces only. Do not exceed 25 mph (40 km/h)
in this range.
 N (Neutral) — This range disengages both the front and
rear driveshafts from the powertrain. To be used for flat
towing behind another vehicle
Úpage 187.
NOTE:
The 4WD HIGH and 4WD LOW positions are designed
for loose, slippery road surfaces only. Driving in the
4WD HIGH and 4WD LOW positions on dry, hard
surfaced roads may cause increased tire wear and
damage to the driveline components.
 The transfer case N (Neutral) button is located in the
center of the 4WD Control Switch and is pushed by
using a ballpoint pen or similar object. The transfer
case N (Neutral) position is to be used for recreational
towing only
Úpage 187.
Transfer Case Position Indicator Lights
The Transfer Case Position Indicator Lights (4WD HIGH
and 4WD LOW) are located in the instrument cluster and
indicate the current and desired transfer case selection.
When you select a different transfer case position, the
indicator lights will do the following:

1. The current position indicator light will turn off.

2. The selected position indicator light will flash until the transfer case completes the shift.
3. When the shift is complete, the indicator light for the selected position will stop flashing and remain on. If the transfer case does not shift into the desired position,
one or more of the following events may occur:

1. The indicator light for the current position will
remain on.

2. The newly selected position indicator light will continue to flash.
3. If the transfer case will not shift, a message will
appear on the cluster stating the 4WD shift has
canceled.NOTE:Before retrying a selection, make certain that all the
necessary requirements for selecting a new transfer case
position have been met. To retry the selection, push the
current position, wait five seconds, and retry selection.
The SERV 4WD Warning Light monitors the electronic shift
four-wheel drive system. If this light remains on after
engine start-up or illuminates during driving, it means that
the four-wheel drive system is not functioning properly and
that service is required.WARNING!
 You or others could be injured or killed if you leave
the vehicle unattended with the transfer case in the
N (Neutral) position without first fully engaging the
parking brake. The transfer case N (Neutral) position
disengages both the front and rear drive shaft from
the powertrain, and will allow the vehicle to roll, even
if the transmission is in PARK. The parking brake
should always be applied when the driver is not in the
vehicle.
 The transmission may not engage PARK if the vehicle
is moving. Always bring the vehicle to a complete
stop before shifting to PARK, and verify that the
transmission gear position indicator solidly indicates
PARK (P) without blinking. Ensure that the vehicle is
completely stopped, and the PARK position is prop -
erly indicated, before exiting the vehicle.
WARNING!
Always engage the parking brake when powering down
the vehicle if the SERV 4WD Warning Light is
illuminated. Not engaging the parking brake may allow
the vehicle to roll which may cause personal injury or
death.
4

23_DT_OM_EN_USC_t.book Page 131

132STARTING AND OPERATING
NOTE:Do not attempt to make a shift while only the front or rear
wheels are spinning. This could cause damage to driveline
components.
When operating your vehicle in 4WD LOW, the engine
speed is approximately three times that of the 2WD or
4WD HIGH positions at a given road speed. Take care not
to overspeed the engine and do not exceed 25 mph
(40 km/h).
Proper operation of four-wheel drive vehicles depends on
tires of equal size, type and circumference on each wheel.
Any difference in tire size can cause damage to the
drivetrain.
Because four-wheel drive provides improved traction,
there is a tendency to exceed safe turning and stopping
speeds. Do not go faster than road conditions permit.
Shifting Procedure
If any of the requirements to select a new transfer case
position have not been met, then the transfer case will
not shift. The position indicator light for the previous
position will remain on and the newly selected position
indicator light will continue to flash until all the require -
ments for the selected position have been met.
 If all the requirements to select a new transfer case
position have been met, then the current position indi -
cator light will turn off and the selected position indi -
cator light will flash until the transfer case completes
the shift. When the shift is complete, the position indi -
cator light for the selected position will stop flashing
and remain on.
FIVE-POSITION ELECTRONICALLY
S
HIFTED TRANSFER CASE —
I
F EQUIPPED
This is an electronic shift transfer case and is operated by
the 4WD Control Switch (Transfer Case Switch), which is
located on the instrument panel.

Five-Position/On-Demand Transfer Case
Five-Position/On-Demand Transfer Case — GT Models

This electronically shifted transfer case provides five
positions:
 Two-Wheel Drive High Range (2WD) — This range is for
normal street and highway driving on dry hard surfaced
roads. Driving the vehicle in 2WD will have greater fuel
economy benefits as the front axle is not engaged in
2WD.
 Four-Wheel Drive Automatic High Range (4WD AUTO) —
This range sends power to the front wheels automati -
cally when the vehicle senses a loss of traction. This
range may be used during varying road conditions.
 Four-Wheel Drive High Range (4WD HIGH) — This range
provides torque to the front driveshaft (engages
four-wheel drive) which allows front and rear wheels to
spin at the same speed. This provides additional trac -
tion for loose or slippery road surfaces only.
 Four-Wheel Drive Low Range (4WD LOW) — This range
provides low speed four-wheel drive. It maximizes
torque (increased torque over 4WD HIGH) to the front
driveshaft; allowing front and rear wheels to rotate at
the same speed. This range provides additional trac -
tion and maximum pulling power for loose or slippery
road surfaces only. Do not exceed 25 mph (40 km/h)
in this range.
 N (Neutral) — This range disengages both the front and
rear driveshafts from the powertrain. To be used for flat
towing behind another vehicle
Úpage 187.

23_DT_OM_EN_USC_t.book Page 132

STARTING AND OPERATING133
NOTE:
The 4WD HIGH and 4WD LOW positions are designed
for loose, slippery road surfaces only. Driving in the
4WD HIGH and 4WD LOW positions on dry hard
surfaced roads may cause increased tire wear and
damage to the driveline components.
 The transfer case N (Neutral) button is located in the
center of the 4WD Control Switch and is pushed by
using a ballpoint pen or similar object. The transfer
case N (Neutral) position is to be used for recreational
towing only
Úpage 187. Transfer Case Position Indicator Lights
The Transfer Case Position Indicator Lights (4WD HIGH,
4WD LOW, and 4WD AUTO) are located in the instrument
cluster and indicate the current and desired transfer case
selection. When you select a different transfer case
position, the indicator lights will do the following:

1. The current position indicator light will turn off.

2. The selected position indicator light will flash until the
transfer case completes the shift.
3. When the shift is complete, the indicator light for the selected position will stop flashing and remain on.
If the transfer case does not shift into the desired position,
one or more of the following events may occur:

1. The indicator light for the current position will remain on.

2. The newly selected position indicator light will continue to flash.
3. If the transfer case will not shift, there will be a cluster
message stating the 4WD shift has canceled.
NOTE:Before retrying a selection, make certain that all the
necessary requirements for selecting a new transfer case
position have been met. To retry the selection, push the
current position, wait five seconds, and retry selection.
The SERV 4WD Warning Light monitors the electronic shift
four-wheel drive system. If this light remains on after
engine start-up or illuminates during driving, it means that
the four-wheel drive system is not functioning properly and
that service is required.
NOTE:Do not attempt to make a shift while only the front or rear
wheels are spinning. This could cause damage to driveline
components.
When operating your vehicle in 4WD LOW, the engine
speed is approximately three times that of the 2WD, 4WD
AUTO or 4WD HIGH positions at a given road speed. Take
care not to overspeed the engine and do not exceed
25 mph (40 km/h).
Proper operation of four-wheel drive vehicles depends on
tires of equal size, type and circumference on each wheel.
Any difference in tire size can cause damage to the
drivetrain.
Because four-wheel drive provides improved traction,
there is a tendency to exceed safe turning and stopping
speeds. Do not go faster than road conditions permit.
WARNING!
 You or others could be injured or killed if you leave
the vehicle unattended with the transfer case in the
N (Neutral) position without first fully engaging the
parking brake. The transfer case N (Neutral) position
disengages both the front and rear drive shaft from
the powertrain, and will allow the vehicle to roll, even
if the transmission is in PARK. The parking brake
should always be applied when the driver is not in the
vehicle.
 The transmission may not engage PARK if the vehicle
is moving. Always bring the vehicle to a complete
stop before shifting to PARK, and verify that the
transmission gear position indicator solidly indicates
PARK (P) without blinking. Ensure that the vehicle is
completely stopped, and the PARK position is
properly indicated, before exiting the vehicle.
WARNING!
Always engage the parking brake when powering down
the vehicle if the SERV 4WD Warning Light is
illuminated. Not engaging the parking brake may allow
the vehicle to roll which may cause personal injury or
death.
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