2008 DODGE RAM 2500 DIESEL immobilizer

SENTRY KEYT
The Sentry KeytImmobilizer system prevents unautho-
rized vehicle operation by disabling the engine. The
system does not need to be armed or activated. Operation
is automatic, regardless of whether the vehicle is locked
or unlocked.
The system uses ignition keys that have an embedded
electronic chip (transponder) to prevent unauthorized
vehicle operation. Therefore, only keys that are pro-
grammed to the vehicle can be used to start and operate
the vehicle. The system will shut the engine off in two
seconds if someone uses an invalid key to try to start the
engine.
NOTE:A key that has not been programmed is also
considered an invalid key, even if it is cut to fit the
ignition switch lock cylinder for that vehicle.
During normal operation, after turning on the ignition
switch, the Vehicle Security Alarm Indicator Light willturn on for three seconds for a bulb check. If the light
remains on after the bulb check, it indicates that there is
a problem with the electronics. In addition, if the light
begins to flash after the bulb check, it indicates that
someone used an invalid key to try to start the engine.
Either of these conditions will result in the engine being
shut off after two seconds.
If the Vehicle Security Alarm Indicator Light turns on
during normal vehicle operation (vehicle running for
longer than 10 seconds), it indicates that there is a fault in
the electronics. Should this occur, have the vehicle ser-
viced as soon as possible.
NOTE:
²The Sentry KeytImmobilizer System is not compat-
ible with some aftermarket remote starting systems.
Use of these systems may result in vehicle starting
problems and loss of security protection.
THINGS TO KNOW BEFORE STARTING YOUR VEHICLE 15
2

²Exxon/Mobil SpeedpassŸ, additional Sentry Keyst,
or any other transponder-equipped components on
the same key chain willnotcause a key-related
(transponder) fault unless the additional part isphysi-
cally held against the ignition keybeing used when
starting the vehicle. Cell phones, pagers, or other RF
electronics will not cause interference with this system.
All of the keys provided with your new vehicle have
been programmed to the vehicle electronics.
Replacement Keys
NOTE:Only keys that are programmed to the vehicle
electronics can be used to start and operate the vehicle.
Once a Sentry Keytis programmed to a vehicle, it cannot
be programmed to any other vehicle.
CAUTION!
Always remove the Sentry Keystfrom the vehicle
and lock all doors when leaving the vehicle
unattended.
At the time of purchase, the original owner is provided
with a four-digit Personal Identification Number (PIN).
Keep the PIN in a secure location. This number is
required for authorized dealer replacement of keys. Du-
plication of keys may be performed at an authorized
dealer or by following the customer key programming
procedure. This procedure consists of programming a
blank key to the vehicle electronics. A blank key is one
that has never been programmed.
NOTE:When having the Sentry KeytImmobilizer
System serviced, bring all vehicle keys with you to an
authorized dealer.
16 THINGS TO KNOW BEFORE STARTING YOUR VEHICLE

Illuminated Entry........................ 20
Immobilizer (Sentry Key)................... 15
Infant Restraint........................61,62
Inflation Pressure Tires.................... 333
Information Center...................... 143
Information Center, Vehicle................. 143
Inside Rearview Mirror.................... 84
Instrument Cluster....................188,189
Instrument Panel and Controls.............. 187
Instrument Panel Lens Cleaning............. 458
Integrated Power Module (Fuses)............ 459
Interior Appearance Care.................. 457
Interior Lights.......................... 129
Intermittent Wipers (Delay Wipers)........... 136
Intervention Regeneration Strategy........... 425
Introduction............................. 4
Jack Location........................... 385
Jack Operation.......................... 387Jump Starting.......................... 397
Key, Programming........................ 17
Key, Replacement........................ 16
Key, Sentry (Immobilizer)................... 15
Keyless Entry System...................... 21
Keys................................. 12
Knee Bolster............................ 48
Lane Change and Turn Signals.............. 133
Lap Belts.............................. 45
Lap/Shoulder Belts....................... 36
LATCH (Lower Anchors and Tether for
CHildren).............................. 65
Life of Tires............................ 330
Lights..............................78,129
Airbag............................58,190
Anti-Lock Warning..................195,314
Brake Warning........................ 194
INDEX 513
10

Reclining............................ 117
Reclining Rear........................ 121
Security Alarm (Theft Alarm).............19,192
Selection of Coolant (Antifreeze)..........438,480
Sentry Key (Immobilizer)................... 15
Sentry Key Programming................... 17
Sentry Key Replacement................... 16
Service Assistance....................... 497
Service Contract......................... 499
Service Information...................... 410
Service Manuals........................ 501
Setting the Clock.............200,204,212,225,239
Settings, Personal........................ 146
Shifting............................... 285
Automatic Transmission................. 285
Manual Transmission................... 291
Transfer Case......................... 297
Transfer Case, Shifting into Transfer Case
Neutral (N).......................376,378Transfer Case, Shifting out of Transfer Case
Neutral (N).......................377,380
Shoulder Belt Upper Anchorage.............. 43
Shoulder Belts........................... 36
Signals, Turn........................... 133
Sliding Rear Window
Power............................34,173
Slippery Surfaces, Driving On............... 307
Snow Chains (Tire Chains)................. 333
Snow Plow............................ 371
Snow Tires............................ 335
Soot Filter............................. 425
Spare Tire............................. 328
Speed Control (Cruise Control).............. 139
Speedometer........................... 190
Starting............................... 268
Automatic Transmission................. 268
Engine Block Heater.................268,276
Manual Transmission................... 269
INDEX 519
10