2012 JEEP GRAND CHEROKEE ECU

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.
Overdrive Operation
The automatic transmission includes an electronically
controlled Overdrive (fifth gear). The transmission will
automatically shift into the Overdrive gear if the follow-
ing conditions are present:
•the shift lever is in the DRIVE position,
•vehicle speed is sufficiently high, and
•the driver is not heavily pressing the accelerator.
When to Use TOW Mode
When driving in hilly areas, towing a trailer, carrying a
heavy load, etc., and frequent transmission shifting oc-
curs, select TOW mode, using the rotary switch on the
center console. Selecting TOW mode will improve per-
formance and reduce the potential for transmission over-
heating or failure due to excessive shifting. Refer to
“Selec-Terrain” in “Starting And Operating” for further
information.
AUTOSTICK
AutoStickis a driver-interactive transmission feature
that offers manual gear shifting to provide you with more
control of the vehicle. AutoStickallows you to maximize
engine braking, eliminate undesirable upshifts and
downshifts, and improve overall vehicle performance.
5
STARTING AND OPERATING 389

capacity conditions, and with no occupants or cargo
loaded into the vehicle. The front and rear curb weight
values are determined by weighing your vehicle on a
commercial scale before any occupants or cargo are
added.
Loading
The actual total weight and the weight of the front and
rear of your vehicle at the ground can best be determined
by weighing it when it is loaded and ready for operation.
The entire vehicle should first be weighed on a commer-
cial scale to ensure that the GVWR has not been ex-
ceeded. The weight on the front and rear of the vehicle
should then be determined separately to be sure that the
load is properly distributed over front and rear axle.
Weighing the vehicle may show that the GAWR of either
the front or rear axles has been exceeded, but the total
load is within the specified GVWR. If so, weight must be
shifted from front to rear, or rear to front, as appropriateuntil the specified weight limitations are met. Store the
heavier items down low and be sure that the weight is
distributed equally. Stow all loose items securely before
driving.
Improper weight distributions can have an adverse affect
on the way your vehicle steers and handles, and the way
the brakes operate.
CAUTION!
Do not load your vehicle any heavier than the GVWR
or the maximum front and rear GAWR. If you do,
parts on your vehicle can break, or it can change the
way your vehicle handles. This could cause you to
lose control. Also, overloading can shorten the life of
your vehicle.
5
STARTING AND OPERATING 445

WARNING! (Continued)
•Make certain that the load is secured in the trailer
and will not shift during travel. When trailering
cargo that is not fully secured, dynamic load shifts
can occur that may be difficult for the driver to
control. You could lose control of your vehicle and
have an accident.
•When hauling cargo or towing a trailer, do not
overload your vehicle or trailer. Overloading can
cause a loss of control, poor performance or dam-
age to brakes, axle, engine, transmission, steering,
suspension, chassis structure or tires.
•Safety chains must always be used between your
vehicle and trailer. Always connect the chains to
the hook retainers of the vehicle hitch. Cross the
chains under the trailer tongue and allow enough
slack for turning corners.
(Continued)
WARNING! (Continued)
•Vehicles with trailers should not be parked on a
grade. When parking, apply the parking brake on
the tow vehicle. Put the tow vehicle transmission
in PARK. Always, block orchockthe trailer
wheels.
•GCWR must not be exceeded.
•Total weight must be distributed between the tow
vehicle and the trailer such that the following four
ratings are not exceeded:
1. GVWR
2. GTW
3. GAWR
4. Tongue weight rating for the trailer hitch uti-
lized (This requirement may limit the ability to
always achieve the 10% to 15% range of tongue
weight as a percentage of total trailer weight).
5
STARTING AND OPERATING 453

pads wear. Brake fluid level should be checked when
pads are replaced. If the brake fluid level is abnormally
low, check system for leaks.
Refer to “Fluids, Lubricants, and Genuine Parts” in
“Maintaining Your Vehicle” for further information.
WARNING!
•Use only manufacturer’s recommended brake
fluid. Refer to “Fluids, Lubricants, and Genuine
Parts” in “Maintaining Your Vehicle” for further
information. Using the wrong type of brake fluid
can severely damage your brake system and/or
impair its performance. The proper type of brake
fluid for your vehicle is also identified on the
original factory installed hydraulic master cylin-
der reservoir.
(Continued)
WARNING! (Continued)
•To avoid contamination from foreign matter or
moisture, use only new brake fluid or fluid that
has been in a tightly closed container. Keep the
master cylinder reservoir cap secured at all times.
Brake fluid in a open container absorbs moisture
from the air resulting in a lower boiling point.
This may cause it to boil unexpectedly during hard
or prolonged braking, resulting in sudden brake
failure. This could result in a accident.
•Overfilling the brake fluid reservoir can result in
spilling brake fluid on hot engine parts, causing
the brake fluid to catch fire. Brake fluid can also
damage painted and vinyl surfaces, care should be
taken to avoid its contact with these surfaces.
(Continued)
7
MAINTAINING YOUR VEHICLE 495

Adaptive Cruise Control (ACC) (Cruise Control) . . 201
Adding Engine Coolant (Antifreeze).......... 491
Adding Fuel........................... 440
Additives, Fuel......................... 438
Air Conditioner Maintenance............... 481
Air Conditioning Refrigerant............... 482
Air Conditioning System.................. 361
Air Conditioning, Operating Tips............ 367
Air Pressure, Tires....................... 419
Airbag.............................. 67,76
Airbag Deployment....................... 78
Airbag Light..................... 75,80,97,284
Airbag Maintenance....................... 79
Airbag, Side........................ 70,73,76
Airbag, Window (Side Curtain)........... 71,73,76
Alarm (Security Alarm)................. 18,292
Alarm, Panic............................ 24
Alterations/Modifications, Vehicle............. 8
Antenna, Satellite Radio................... 347Anti-Lock Brake System (ABS).............. 400
Anti-Lock Warning Light.................. 291
Anti-Theft System....................... 292
Antifreeze (Engine Coolant)..............490,517
Disposal........................... 492
Appearance Care........................ 499
Assistance Towing....................... 125
Auto Down Power Windows................ 41
Automatic Dimming Mirror................ 108
Automatic Door Locks..................... 33
Automatic Headlights.................... 180
Automatic Temperature Control (ATC)......... 361
Automatic Transmission................382,498
Autostick.......................... 389
Fluid Level Check.................... 499
FluidType ......................... 498
Special Additives..................... 498
Autostick............................. 389
Auxiliary Electrical Outlet (Power Outlet)...... 258
548 INDEX

LightBulbs ............................. 99
Lights.............................. 99,179
Airbag...................... 75,80,97,284
Anti-Lock.......................... 291
Automatic Headlights................. 180
Back-Up........................... 514
Brake Assist Warning.................. 407
Brake Warning...................... 289
Bulb Replacement.................... 512
Cargo ............................. 269
Center Mounted Stop.................. 516
Daytime Running.................... 182
Dimmer Switch, Headlight.............. 179
Electronic Stability Program (ESP) Indicator . . 407
Exterior............................ 99
Fog ............................286,513
Fuses............................. 504
Hazard Warning Flasher............... 460
Headlights......................... 512Headlights On With Wipers............. 180
High Beam Indicator.................. 286
Hill Descent Control Indicator........... 286
Illuminated Entry..................... 21
Low Fuel.......................... 304
Malfunction Indicator (Check Engine)...... 284
Map Reading....................... 186
Reading........................186,240
Rear Servicing....................... 514
Rear Tail........................... 514
Seat Belt Reminder................... 289
Security Alarm (Theft Alarm)............ 292
Service............................ 512
Service Engine Soon (Malfunction
Indicator).......................... 284
Side Marker........................ 514
SmartBeams........................ 181
Tire Pressure Monitoring (TPMS)......... 287
Tow/Haul Indicator.................. 286
556 INDEX

Maintenance........................ 504
Pretensioners........................ 60
Reminder.......................... 289
Shoulder Belt Anchorage................ 57
Untwisting Procedure.................. 56
Seats................................. 155
Adjustment......................... 160
Cleaning........................... 503
Easy Entry......................... 176
Memory........................... 173
Power..........................156,158
Rear Folding........................ 170
Reclining .......................... 161
Security Against Theft..................... 18
Security Alarm (Theft Alarm)............. 18,292
Selec-Terrain........................... 392
Selection of Coolant (Antifreeze)............. 490
Selection of Oil......................... 477
Sentry Key (Immobilizer)................... 16Sentry Key Programming................... 18
Sentry Key Replacement................... 17
Service Assistance....................... 539
Service Contract......................... 541
Service Engine Soon Light
(Malfunction Indicator).................... 284
Service Manuals........................ 543
SettingtheClock .....................327,336
Settings, Personal........................ 317
Shift Lever Override...................... 467
Shifting ............................... 380
Automatic Transmission................ 380
Shoulder Belts........................... 51
Side Airbag............................. 76
Signals, Turn................... 99,286,513,514
SmartBeams........................... 181
Sound System
Kicker............................ 357
Spare Tire..........................422,423
10
INDEX 561