
6
STARTING AND OPERATING
STARTING THE ENGINE ........................ 138
Normal Starting — 
Gasoline Engine ........................... 138
Normal Starting — Diesel Engine ......... 141
Diesel Engine Warm-Up ................ 141
Diesel Engine Idling — 
In Cold Weather ........................... 142 Stopping the Engine ..................... 142
ENGINE BREAK-IN RECOMMENDATIONS .... 143
AUTOMATIC TRANSMISSION................. 143
Ignition Park Interlock................... 144
Brake/Transmission Shift Interlock 
System  ....................................... 144 Eight–Speed Automatic 
Transmission................................ 145
FOUR–WHEEL DRIVE OPERATION .......... 146
Four-Position Transfer Case ........... 146
Five-Position Transfer Case ........... 148
Trac-Lok Rear Axle — 
If Equipped ................................. 151 Axle Lock (Tru-Lok) — 
Rubicon Models ........................... 151 Electronic Sway Bar Disconnect — 
If Equipped ................................. 152
STOP/START SYSTEM — AUTOMATIC 
TRANSMISSION (IF EQUIPPED) .............153
Automatic Mode ........................... 154
Possible Reasons The Engine Does 
Not Autostop ............................... 154 To Start The Engine While In 
Autostop Mode ............................. 155 To Manually Turn Off The 
Stop/Start System ........................ 155 To Manually Turn On The 
Stop/Start System ........................ 155 System Malfunction...................... 155
ACTIVE SPEED LIMITER — 
IF EQUIPPED  .......................................156
Activation .................................... 156
Exceeding The Set Speed.............. 156
Deactivation ................................ 156
SPEED CONTROL ..................................157
To Activate .................................. 157
To Set A Desired Speed ................ 158
To Resume Speed  ....................... 158
To Deactivate .............................. 158
ADAPTIVE CRUISE CONTROL (ACC) — 
IF EQUIPPED  .......................................158
To Activate/Deactivate .................. 158
To Set A Desired ACC Speed ......... 159
To Resume .................................. 159
To Vary The Speed Setting  ........... 159
Setting The Following Distance 
In ACC ........................................ 160
PARKSENSE REAR PARK ASSIST — 
IF EQUIPPED ........................................161
ParkSense Sensors ........................161
Enabling And Disabling 
ParkSense ....................................161 ParkSense System Usage 
Precautions ..................................162
PARKSENSE FRONT AND 
REAR PARK ASSIST — IF EQUIPPED ......163
ParkSense Sensors ........................163
ParkSense Warning Display ............163
ParkSense Display ........................163
Enabling And Disabling 
ParkSense ....................................165 Service The ParkSense Park Assist 
System ........................................166 Cleaning The ParkSense System .....166
ParkSense System Usage 
Precautions ..................................166
PARKVIEW REAR BACK UP CAMERA — 
IF EQUIPPED ........................................167
REFUELING THE VEHICLE  .....................169
Fuel Filler Cap ..............................169
Loose Fuel Filler Cap Message  ......170
REFUELING THE VEHICLE — DIESEL ......170
AdBlue® (UREA) — If Equipped ....171
VEHICLE LOADING  ...............................174
Weights Label...............................174
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GETTING TO KNOW YOUR INSTRUMENT PANEL
72
Yellow Indicator Lights/   — 4WD Indicator Light — If Equipped
This light alerts the driver that the vehicle is
in  the  four-wheel  drive  mode,  and  the  front
and rear driveshafts are mechanically locked
together forcing the front and rear wheels to
rotate at the same speed.
/   — 4WD Low Indicator Light — If 
Equipped
This light alerts the driver that the vehicle is
in the four-wheel drive 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.
/   — 4WD Part Time Indicator Light — 
If Equipped
This light alerts the driver that the vehicle is
in  the four-wheel drive part  time  mode,  and
the  front  and  rear  driveshafts  are  mechani -
cally  locked  together  forcing  the  front  and
rear wheels to rotate at the same speed.
 — Active Speed Limiter Fault Indicator 
Light — If Equipped
This  warning  light  will  illuminate  to  signal
when there is a fault detected with the Active
Speed Limiter.
 — Axle Locker Fault Indicator Light
This  light  indicates  when  the  front  and/or
rear axle locker fault has been detected.
 — Forward Collision Warning Off 
Indicator Light — If Equipped
This  indicator  light  illuminates  to  indicate
that Forward Collision Warning is off.
 — Front And Rear Axle Lock Indicator 
Light
This  light  indicates  when  the  front,  rear,  or
both axles have been locked. The telltale will
display  the  lock  icon  on  the  front  and  rear
axles to indicate the current lock status.
/   — Neutral Indicator Light — If 
Equipped
This light alerts the driver that the vehicle is
in the neutral mode.
 — Rear Axle Lock Indicator Light
This  light  indicates  when  the  rear  axle  lock
has been activated.
 — Rear Fog Indicator — If Equipped  
This indicator  light will illuminate when  the
rear fog lights are on.
 — Service Adaptive Cruise Control 
Warning Light — If Equipped
This  light  will  turn  on  when  a  ACC  is  not
operating and needs service. Refer to “Adap -
tive  Cruise  Control  (ACC)”  in  “Starting  And
Operating” for further information.
 — Sway Bar Indicator Light — If 
Equipped
This indicator  light will illuminate when  the
front sway bar is disconnected.
 — Wait To Start Light — If Equipped
This indicator light will illuminate for approx -
imately  two  seconds  when  the  ignition  is
turned to the RUN position. Its duration may
be  longer  based  on  colder  operating  condi -
tions. Vehicle will not initiate start until tell -
tale is no longer displayed.
2020_JEEP_JL_WRANGLER_UG_RHD_UK.book  Page 72   

73
Refer  to  “Starting  The  Engine”  in  “Starting
And Operating” for further information.
NOTE:
The  “Wait  To  Start”  telltale  may  not  illumi-
nate  if  the  intake  manifold  temperature  is
warm enough.
 — Low Diesel Exhaust Emissions Additive 
AdBlue® Indicator Light — If Equipped
The  Low  Diesel  Exhaust  Emissions  Additive
AdBlue®  indicator  light  illuminates  when
the AdBlue® (UREA) level is low.
Fill  the  AdBlue®  tank  as  soon  as  possible
with  at  least  1.3  gallons  (5  liters)  of
AdBlue®.
If  filling  the  tank  is  done  with  a  remaining
range of AdBlue® in the tank equal to zero,
you  may  need  to  wait  two  minutes  before
starting the vehicle.
Refer to “Adding AdBlue®” in “Starting And
Operating” for further information.
 — Water In Fuel Indicator Light — If 
Equipped
The “Water In Fuel Indicator Light” will illu -
minate  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,  and  please  see  an  authorized
dealer.
Green Indicator Lights
 — Adaptive Cruise Control (ACC) Set With 
No Target Detected Indicator Light — If 
Equipped
This  light  will  turn  on  when  the  Adaptive
Cruise  Control  is  set  and  there  is  no  target
vehicle  detected.  Refer  to  “Adaptive  Cruise
Control  (ACC)  —  If  Equipped”  in  “Starting
And Operating” for further information.
 — Adaptive Cruise Control (ACC) Set With 
Target Light — If Equipped
This  will  display  when  the  ACC  is  set  and  a
target vehicle is detected. Refer to “Adaptive
Cruise  Control  (ACC)  —  If  Equipped”  in
“Starting And Operating” for further informa -
tion.
 — 4WD Auto Indicator Light — If 
Equipped
This light alerts the driver that the vehicle is
in  the  four-wheel  drive  auto  mode.  The
system  will  provide  power  to all  four  wheels
and  shift  the  power  between  the  front  and
rear  axles  as  needed.  This  will  provide
maximum traction in dry and slippery condi -
tions.
 — Active Speed Limiter SET Indicator 
Light — If Equipped With A Premium 
Instrument Cluster
This indicator  light will illuminate when  the
Active  Speed  Limiter  is  on  and  set  to  a
specific speed.
Refer  to  “Active  Speed  Limiter  —  If
Equipped”  in  “Starting  And  Operating”  for
further information.
 CAUTION!
The  presence  of  water  in  the  fuel  system
circuit  may  cause  severe  damage  to  the
injection  system  and  irregular  engine
operation.  If  the  indicator  light  is
illuminated,  contact  an  authorized  dealer
as soon as possible to bleed the system. If
the  above  indications  come  on
immediately  after  refuelling,  water  has
probably been poured into the tank: switch
the engine off immediately and contact an
authorized dealer.
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GETTING TO KNOW YOUR INSTRUMENT PANEL
74
 — Cruise Control SET Indicator Light — If 
Equipped With A Premium Instrument Cluster  
This  indicator  light  will  illuminate  when  the
speed control is set to the desired speed. Refer
to “Speed Control — If Equipped” in “Starting
And Operating” for further information.
 — Front Fog Indicator Light — If Equipped
This indicator  light will  illuminate when  the
front fog lights are on.
 — Park/Headlight On Indicator Light 
This indicator  light will  illuminate when  the
park lights or headlights are turned on.
 — Rear Seat Belt Fastened Indicator Light 
— If Equipped 
This light indicates when a rear seat belt has
been  buckled  in  the  second  row.  A  telltale
will  display  in  the  upper  right  corner  of  the
instrument  cluster  display  to  correspond  to
the  specific  seating  position  once  the  seat
belt has been buckled.
Refer  to  “Occupant  Restraint  Systems”  in
“Safety” for further information.
 — Stop/Start Active Indicator Light — If 
Equipped
This indicator  light will  illuminate when  the
Stop/Start function is in “Autostop” mode.
 — Turn Signal Indicator Lights  
When the left or right turn signal is activated,
the  turn  signal  indicator  will  flash  inde -
pendently  and  the  corresponding  exterior
turn signal lamps will flash. Turn signals can
be activated when the multifunction lever is
moved down (left) or up (right).
NOTE:
A  continuous  chime  will  sound  if  the
vehicle  is  driven  more  than  1 mile
(1.6 km) with either turn signal on.
Check for an inoperative outside light bulb
if either indicator flashes at a rapid rate.
White Indicator Lights
 — Adaptive Cruise Control (ACC) Ready 
Light — If Equipped
This  light  will  turn  on  when  the  vehicle
equipped with Adaptive Cruise Control (ACC)
has  been  turned  on,  but  not  set.  Refer  to
“Adaptive  Cruise  Control  (ACC)  —  If
Equipped”  in  “Starting  And  Operating”  for
further information.
 — Two Wheel Drive High Indicator Light 
— If Equipped With a Premium Cluster
This light alerts the driver that the vehicle is
in the two wheel drive high mode.
 — Active Speed Limiter Ready Indicator 
Light — If Equipped With A Premium 
Instrument Cluster
This light will illuminate when the Active Speed
Limiter has been turned on, but not set.
Refer  to  “Active  Speed  Limiter  —  If
Equipped”  in  “Starting  And  Operating”  for
further information.
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GETTING TO KNOW YOUR INSTRUMENT PANEL
76
 — Cruise Control Ready Indicator Light — 
If Equipped With A Premium Instrument 
Cluster  
This light will turn on when the speed control
has  been  turned  on,  but  not  set.  Refer  to
“Speed Control — If Equipped” in “Starting
And Operating” for further information.
 — Cruise Control SET Indicator Light — If 
Equipped With Base Instrument Cluster  
This indicator  light will  illuminate when  the
speed control is set.
Refer  to  “Speed  Control  —  If  Equipped”  in
“Starting And Operating” for further informa -
tion.
 — Cruise Control Ready Indicator Light — 
If Equipped With Base Instrument Cluster  
This light will turn on when the speed control
has  been  turned  on,  but  not  set.  Refer  to
“Speed Control — If Equipped” in “Starting
And Operating” for further information.
 — Active Speed Limiter Ready Indicator 
Light — If Equipped With A Base Instrument 
Cluster
This light will turn on when the Active Speed
Limiter is on, but not set.
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  multi -
function  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.
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STARTING AND OPERATING
156
If  the  “SERVICE  STOP/START  SYSTEM”
message  appears  in  the  instrument  cluster
display,  have  the  system  checked  by  an
authorized dealer.
ACTIVE SPEED LIMITER — IF 
EQUIPPED 
Active Speed Limiter Button
The  Active  Speed  Limiter  button  is  posi -
tioned on the right side of the steering wheel.
This  feature  allows  you  to  program  the
maximum speed of travel for your vehicle.
NOTE:
The Active Speed Limiter can be set with the
vehicle stationary, or in motion.
Activation
To  activate  the  feature,  push  the  Active
Speed  Limiter  button,  and  a  message  will
appear  along  with  an  indicator  light  in  the
instrument  cluster  display  to  signal  that
Active Speed Limiter has been activated.
Push  the  SET  (+)  and  SET  (–)  buttons  on  the
right  of  the  steering  wheel  to  raise  and  lower
the Active  Speed Limiter  to  the  desired  value.
Pushing and holding down the SET (+)  or SET
(–)  buttons  will  increase/decrease  the  speed
value by increments of 5 mph (5 km/h).
Each time that Active Speed Limiter is acti -
vated,  it  will  be  set  to  the  last  programmed
value from the previous activation.
NOTE:
The  Speed  Control  (if  equipped)  and  Adap -
tive Cruise Control (if equipped) features will
be  unavailable  while  the  Active  Speed
Limiter is in use.
Exceeding The Set Speed
By  fully  pressing  the  accelerator  pedal,  the
programmed  maximum  speed  can  be
exceeded while the device is active.
In  the  event  that  the  Active  Speed  Limiter
set value is exceeded manually with a driver
acceleration, an audible indicator will sound,
the  indicator  light  will  rapidly  flash,  and  a
message  will  appear  in  the  instrument
cluster display.
The  feature  will  remain  disabled  until  the
vehicle  speed  drops  below  the  set  Active
Speed Limiter value, where it will reactivate
automatically.
Deactivation
To  turn  off  Active  Speed  Limiter,  push  the
Active Speed Limiter button on the right side
of the steering wheel. A message will appear
in  the  instrument  cluster  display  to  confirm
that the feature has been turned off.
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157
SPEED CONTROL  
When engaged, the Speed Control takes over
accelerator operations at speeds greater than
20 mph (32 km/h).The Speed Control buttons are located on the
right side of the steering wheel.
Speed Control Buttons NOTE:In  order  to  ensure  proper  operation,  the
Speed Control  System has  been designed
to  shut  down  if  multiple  Speed  Control
functions are operated at the same time. If
this occurs, the Speed Control System can
be  reactivated  by  pushing  the  Speed
Control  on/off  button  and  resetting  the
desired vehicle set speed.
Do  not  place  the  gear  selector  in  neutral
when Speed Control is activated. Doing so
will disengage the system.
To Activate
Push the on/off button to activate the Speed
Control.  The  cruise  indicator  light  in  the
instrument cluster display will illuminate. To
turn the system off, push the on/off button a
second  time.  The  cruise  indicator  light  will
turn  off.  The  system  should  be  turned  off
when not in use.
1 — SET (+)/Accel
2 — On/Off
3 — RES/Resume
4 — SET (-)/Decel
5 — CANC/Cancel
 WARNING!
Speed Control can be dangerous where the
system  cannot  maintain  a  constant speed.
Your  vehicle  could  go  too  fast  for  the
conditions, and you could lose control and
have  an  accident.  Do  not  use  Speed
Control in heavy traffic or on roads that are
winding, icy, snow-covered or slippery.
 WARNING!
Leaving the Speed Control system on when
not  in  use  is  dangerous.  You  could
accidentally  set  the  system  or  cause  it  to
go  faster  than  you  want.  You  could  lose
control and have an accident. Always leave
the system off when you are not using it.
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STARTING AND OPERATING
158
To Set A Desired Speed
Turn the Speed Control on.
NOTE:
The  vehicle  should  be  traveling  at  a  steady
speed  and  on  level  ground  before  pushing
the SET (+) or SET (-) button.
When  the  vehicle  has  reached  the  desired
speed,  push  the  SET  (+)  or  SET  (-)  button
and release. Release the accelerator and the
vehicle will operate at the selected speed.
To Resume Speed 
To  resume  a  previously  set  speed,  push  the
RES  button  and  release.  Resume  can  be
used at any speed above 20 mph (32 km/h).
To Deactivate 
A  soft  tap  on  the  brake  pedal,  pushing  the
CANC (cancel) button, or normal brake pres-
sure while slowing the vehicle will deactivate
the  Speed  Control  without  erasing  the  set
speed from memory.
Pushing the on/off button or placing the igni -
tion in the OFF position, erases the set speed
from memory.
ADAPTIVE CRUISE 
CONTROL (ACC) — IF 
EQUIPPED   
Adaptive Cruise Control Buttons
If  your  vehicle  is  equipped  with  Adaptive
Cruise  Control,  the  controls  operate  exactly
the same as Speed Control with only a couple
of differences. With this option, you can set
a specified distance you would like to main -
tain between you and the vehicle  in front of
you. If  the  ACC  sensor  detects  a  vehicle  ahead,
ACC  will  apply  limited  braking  or  accelera
-
tion  automatically  to  maintain  a  preset
following distance, while matching the speed
of the vehicle ahead.
If the sensor does not detect a vehicle ahead
of you, ACC will maintain a fixed set speed.
To Activate/Deactivate
Push and release the Adaptive Cruise Control
(ACC)  on/off  button.  The  ACC  menu  in  the
instrument cluster displays “ACC Ready.”
To turn the system off, push and release the
Adaptive  Cruise  Control  (ACC)  on/off  button
again.  At  this  time,  the  system  will  turn  off
and  the  instrument  cluster  displays  “Adap -
tive Cruise Control (ACC) Off.”
1 — Distance Setting Increase
2 — Adaptive Cruise Control (ACC) On/Off
3 — Distance Setting Decrease
 WARNING!
Leaving  the  Adaptive Cruise Control  (ACC)
system  on  when  not  in  use  is  dangerous.
You  could  accidentally  set  the  system  or
cause  it  to  go  faster  than  you  want.  You
could  lose  control  and  have  a  collision.
Always  leave  the  system  off  when  you  are
not using it.
2020_JEEP_JL_WRANGLER_UG_RHD_UK.book  Page 158