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Climate (8.4A/8.4AN)
Too hot? Too cold? Adjust vehicle temperatures hands-
free and keep everyone comfortable while you keep
moving ahead. (If vehicle is equipped with climate
control.)
Push the VR button. After the beep, say one of the
following commands:
•Set driver temperature to70degrees
•Set passenger temperature to70degrees
TIP:Voice Command for Climate may only be used to
adjust the interior temperature of your vehicle. Voice
Command will not work to adjust the heated seats or
steering wheel if equipped.
Uconnect 8.4A/8.4AN Climate
4
UNDERSTANDING YOUR INSTRUMENT PANEL 429
Page 444 of 871

▫Brake/Transmission Shift Interlock System . . .461
▫Eight-Speed Automatic Transmission —
If Equipped.........................461
▫Six-Speed Automatic Transmission —
1500 Models Only (If Equipped)...........470
▫Six-Speed Automatic Transmission —
2500/3500 Models Only................483
!FOUR-WHEEL DRIVE OPERATION —
IF EQUIPPED.........................494
▫Manually Shifted Transfer Case —
If Equipped..........................494
▫Electronically Shifted Transfer Case (Four-Position
Switch) — If Equipped.................498
▫Electronically Shifted Transfer Case (Five-Position
Switch) — If Equipped.................504
▫Electronically Shifted Transfer Case (Five-Position
Switch) — If Equipped.................509
!AIR SUSPENSION SYSTEM (1500 MODELS) —
IF EQUIPPED.........................516
▫Description..........................516
▫Air Suspension Modes..................520
▫Electronic Vehicle Information Center
(EVIC)/Driver Information Display (DID)
Display Messages.....................522
▫Operation...........................522
!AIR SUSPENSION SYSTEM (2500/3500 MODELS) —
IF EQUIPPED..........................524
▫Description..........................524
▫Air Suspension Modes..................526
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▫Tire Identification Number (TIN)...........600
▫Tire Terminology And Definitions..........602
▫Tire Loading And Tire Pressure...........603
!TIRES — GENERAL INFORMATION........608
▫Tire Pressure........................608
▫Tire Inflation Pressures.................610
▫Tire Pressures For High Speed Operation . . . .611
▫Radial Ply Tires......................611
▫Tire Types...........................612
▫Run Flat Tires — If Equipped.............614
▫Spare Tires — If Equipped...............614
▫Tire Spinning........................617
▫Tread Wear Indicators..................617
▫Life Of Tire.........................618
▫Replacement Tires.....................619
!SUPPLEMENTAL TIRE PRESSURE INFORMATION —
IF EQUIPPED..........................620
!TIRE CHAINS (TRACTION DEVICES).......621
!TIRE ROTATION RECOMMENDATIONS.....623
▫Directional Tires — If Equipped...........624
▫Dual Rear Wheels — If Equipped..........624
!TIRE PRESSURE MONITOR SYSTEM (TPMS) . .626
▫Premium System......................629
▫Tire Pressure Information System (TPIS)
3500 Series Trucks.....................632
▫General Information...................634
!FUEL REQUIREMENTS..................634
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▫Trailer Hitch Type and Maximum Trailer
Weight.............................656
▫Trailer Towing Weights (Maximum Trailer
Weight Ratings)......................657
▫Trailer And Tongue Weight..............657
▫Towing Requirements..................658
▫Towing Tips.........................667
!SNOWPLOW.........................669
▫1500 Models Only.....................669
▫2500/3500 Models Only.................670
!RECREATIONAL TOWING (BEHIND
MOTORHOME, ETC.)...................673
▫Towing This Vehicle Behind Another Vehicle . . .673
▫Recreational Towing — Two-Wheel Drive
Models.............................674
▫Recreational Towing — Four-Wheel Drive
Models.............................6755
STARTING AND OPERATING 447
Page 464 of 871

speeds (refer to#Brake/Transmission Shift Interlock Sys-
tem#in this section). To shift past multiple gear ranges at
once (such as Park to Drive), simply rotate the gear
selector to the appropriate detent. Select the DRIVE range
for normal driving.
The electronically-controlled transmission provides a
precise shift schedule. The transmission electronics are
self-calibrating; therefore, the first few shifts on a new
vehicle may be somewhat abrupt. This is a normal
condition, and precision shifts will develop within a few
hundred miles (kilometers).
Only shift from DRIVE to PARK or REVERSE when the
accelerator pedal is released and the vehicle is stopped.
Be sure to keep your foot on the brake pedal when
shifting between these gears.
The transmission gear selector has only PARK, RE-
VERSE, NEUTRAL, and DRIVE positions. Manual down-
shifts can be made using the Electronic Range Select
(ERS) shift control (refer to#Electronic Range Select (ERS)
Operation#in this section for further information). Press-
ing the GEAR-/GEAR+ switches (on the steering wheel)
while in the DRIVE position will select the highest
available transmission gear, and will display that gear in
the instrument cluster as 1, 2, 3, etc.
Electronic Transmission Gear Selector
462 STARTING AND OPERATING
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Gear Ranges
DO NOT race the engine when shifting from PARK or
NEUTRAL into another gear range.
NOTE:After selecting any gear range, wait a moment to
allow the selected gear to engage before accelerating.
This is especially important when the engine is cold.
PARK (P)
This range supplements the parking brake by locking the
transmission. The engine can be started in this range.
Never attempt to use PARK while the vehicle is in
motion. Apply the parking brake when leaving the
vehicle in this range.
When parking on a level surface, you may shift the
transmission into PARK first, and then apply the parking
brake.
When parking on a hill, apply the parking brake before
shifting the transmission to PARK. As an added precau-
tion, turn the front wheels toward the curb on a downhill
grade and away from the curb on an uphill grade.
NOTE:On four-wheel drive vehicles be sure that the
transfer case is in a drive position.
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 move-
ment and possible injury or damage.
•Your vehicle could move and injure you and others
if it is not in PARK. Make sure the transmission is
in PARK before leaving the vehicle.
(Continued)
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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 recom-
mend that you visit your authorized dealer at your
earliest possible convenience. Your authorized dealer has
diagnostic equipment to determine if the problem could
recur.
If the transmission cannot be reset, authorized dealer
service is required.
Electronic Range Select (ERS) Operation —
Eight-Speed Transmission
The Electronic Range Select (ERS) shift control allows the
driver to limit the highest available gear when the
transmission is in DRIVE. For example, if you shift the
transmission into 4 (fourth gear), the transmission will
not shift above fourth gear (except to prevent engine
overspeed), but will shift through the lower gears nor-
mally.
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, shift-
ing 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
maintain that gear as the top available gear. Once in ERS
mode, tapping the GEAR- or GEAR+ switch will change
the top available gear.
468 STARTING AND OPERATING
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To exit ERS mode, simply press and hold the GEAR+
switch until “D” is once again displayed in the instru-
ment cluster.
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.
When to Use TOW/HAUL Mode
When driving in hilly areas, towing a trailer, carrying a
heavy load, etc., and frequent transmission shifting oc-
curs, press 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.
1 — ERS (-) Switch2 — ERS (+) Switch
5
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