Jeep will turn on and run for about 3 seconds then shuts down eventually will stay running could it be the key or switch?

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Anti-theft system problem ? Is there a SECURITY light on the instrument cluster that stay's lit ?

Does the car stall when sitting still, might just be that the key is worn and wiggles itself out just enough to shut down the vehicle

Can you disable the alarm by locking and unlocking the driver door with the key ?

IMMO cuts fuel. that is its job, fix that secuity system.
the FSM covers this.
if you tried both the key fobs , that came with car?
do so... now....!

if not why not?
are you using only a single key , to test this? do so.
no other keys near ignition switch.
do have this, the oper guide?
page 14?

http://justgivemethedamnmanual.com/jeep/jeep-compass-owners-manuals/

next is to read the IMMO sections (immoblizer) in FSM
or alldata.com to find true cause of IMMO tripped.

quote page 14, (it's clear , no?)
SENTRY KEY
The Sentry Key Immobilizer System prevents unauthorized
operation of the vehicle by disabling the engine.
The system will shut the engine off after 2 seconds of
running if an invalid key is used to start the vehicle. This
system utilizes ignition keys which have an electronic
chip (transponder) embedded into them. Only keys that
have been programmed to the vehicle can be used to start
and operate the vehicle.
The Sentry Key Immobilizer System does not need to be
armed or activated. Operation of the system is automatic
regardless of whether or not the vehicle is locked or
unlocked. During normal operation, the Theft Alarm/
Immobilizer Light will come on for three (3) seconds
immediately after the ignition switch is turned on for a
bulb check. Afterwards, if the bulb remains on, this
indicates a problem with the electronics.
If the bulb begins to flash after the bulb check, this
indicates that an invalid key has been used to start the
vehicle. Both of these conditions will result in the engine
being shut off after two (2) seconds of running.
Keep in mind that a key which has not been programmed
is also considered an invalid key even if it is cut to fit the
ignition lock cylinder for that vehicle.
If the Theft Alarm/Immobilizer Light comes on during
normal vehicle operation (vehicle has been running for
longer than 10 seconds), a fault has been detected in the
electronics and the vehicle should be serviced as soon as
possible.
14 THINGS TO KNOW BEFORE STARTING YOUR VEHICLE
end qoute:

It could be the security system or maybe a crank sensor.

Replace the key Im the forman for a jeep dealership. The dealer should have told you that in the first place. there is no reason the key would unprogram itself unless the chip is intermitently shorting out. If you have another key start it if it stay running u know the key is at fault. hope this helps u out.

Ignition key needs programing or its faulty.A

faulty Key disarms the immobilizer for about 2 seconds then shuts down the engine

Hi Jeepers,

The fan will occassionally continue to run for five or ten minutes after the vehicle shuts down. This is normal.

What is not normal is if it keeps running until the battery drains.

Does it just keep running?
If it eventually shuts off, how long does it take?
Did this just start happening?
The two days you mentioned, were they short trips, opposed to the third day?

If you would comment me back with some more details, it would help me help you.

Mike

Lock all the doors unlock the doors with the key because the security system thinks its being stolen and it shuts off the injectors
Try another key the chip in yours may be defective.

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