Turns itself off within 2 seconds of being started

Your Jeep has what's known as the delayed start, no check engine light problem. The Jeep will not start until the check engine light comes on, on the dashboard. Next time it cranks but will not start, look at the dashboard to see if the check engine light is illuminated. If it's not lit up, then your Jeep does have that problem and your Jeep ecu is in need of repair or replacement. There are components inside the ecu that are going bad and will continue to get worse, eventually leading to a permanent no start condition. There are ecu repair services and replacement ecus on ebay.

CAR NO START PROBLEMS:-----

It can be the issue with weak battery or faulty battery or if battery is ok,then its faulty starter causing the issue.

From start to end troubleshooting these problem i suggest you to click the link below and follow its procedure:-----

What to Do When Car Turns Over But Won't Start?

http://technoanswers.blogspot.com/2012/11/what-to-do-when-car-turns-over-but-wont.html

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Car starting issues?

http://technoanswers.blogspot.in/2012/02/car-starting-issues.html

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Car Starting Problems

http://whoisbyme.blogspot.in/2012/06/car-starting-problems.html

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1991 Toyota Trecel: Engine Starts fine but dies when gets Warm?

http://whatisbyme.blogspot.in/2012/05/1991-toyota-trecel-engine-starts-fine.html

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1994 Toyota Pickup: Starts fine but dies in few seconds?

http://howtobyme.blogspot.in/2012/05/1994-toyota-pickup-starts-fine-but-dies.html

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1999 Chrysler Cirrus: 8 IGN Fuel Starter Fuse Blows?

http://whatisbyme.blogspot.in/2012/06/1999-chrysler-cirrus-8-ign-fuel-starter.html

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2001 Toyota Camry: No start After replacing Battery?

http://whatisbyme.blogspot.in/2012/05/2001-toyota-camry-no-start-after.html

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1989 Toyota Pickup Truck: Turns over but not start?

http://whatisbyme.blogspot.in/2012/05/1989-toyota-pickup-truck-turns-over-but.html

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Car dead and will not Start?

http://whatisbyme.blogspot.in/2012/05/car-dead-and-will-not-start.html

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1995 Lexus LS400: Running Hot?

http://whatisbyme.blogspot.in/2012/05/1995-lexus-ls400-running-hot.html

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2001 Toyota Prius will not start?

http://whatisbyme.blogspot.in/2012/05/2001-toyota-prius-will-not-start.html

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1996 Jeep Grand Cherokee: Engine will not start?

http://repairhelpcenter.blogspot.in/2012/06/1996-jeep-grand-cherokee-engine-will.html

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Mitsubishi will not start

http://www.howtorepairguide.com

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These will help.

Thanks.

Are you check your previoud questions: check_engine_error

Keep us updated.

Depend what Engine Model you have:
2001 - 2004 (WG) Grand Cherokee (International Markets)
1999 - 2004 (WJ) Grand Cherokee (All Markets)
WJ engine Specifications
4.0L I-6 1-5-3-6-2-4
4.7L V8 1-8-4-3-6-5-7-2
4.7L V8 HO 1-8-4-3-6-5-7-2

For the 1995 Jeep Grand Cherokee:
I do not know if you have the 4.0L In-Line (Straight) 6-Cylinder or the 5.2L V8; however I have included bothe below.

For the 4.0L In-Line 6-Cylinder:
Firing Order:
1-5-3-6-2-4
Cylinders:
(back)
|..6..|
|..5..|
|..4..|
|..3..|
|..2..|
|..1..|
(front)
Distributor:
...(back)
....5...3.(+)-screw
1...........6
(+)4...2
...(front)

For the 5.2L V8:
Firing Order:
1-8-4-3-6-5-7-2
Cylinders:
.......(back)......
|..8..|........|..7..|
|..6..|........|..5..|
|..4..|........|..3..|
|..2..|........|..1..|
.......(front)
Distributor:
.......(back)
.........3
...4.........6
8...............5
...1.........7
.........2
.......(front)

Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.com!

fuel system problem; filter, pump, injectors.

Alarms usually won't allow the engine to crank. If it is the alarm, arming then disarming it usually gets them to start. However, you probably aren't that lucky. Probably the most common problem for Cherokees with ignition issues is a crank sensor or a fuel pump. Listen to hear if the fuel pump runs when you turn the key to the run position (it will only run for 2 seconds, so have someone else turn the key while you listen at the gas filler neck)

Check your fuel pump ,fuel lines,.One of the most overlooked starting causes is fuel delivery. Find the fuel rail to the injectors. Assuming you don't have a fuel pressure gauge, remove the dust cap on the fitting on the fuel rail and press the center pin in the valve to see if there's a good amount of pressure for a very brief second. There will be no continuous pressure unless the engine is running or is being cranked over. Have somebody crank it for you for a second to see if high pressure is present.

If not, first look at the fuel cutoff switch usually located in the inside stowage compartment of the vehicle. See if the reset button clicks when you press it. Next check the fuel pump fuse and relay, and finally the pump itself could be bad.

12 is a battery disconnect within the last 50 start cycles and 55 means the end of the diagnostic cycle.  Basically the computer found nothing wrong. The 12 code may seem incorrect if you haven't disconnected the battery recently, but from my experience the 12 code shows up almost all the time regardless.

SOUNDS LIKE A FUEL PUMP RELAY CONSULT YOUR OWNERS MANUAL FOR LOCATION