2002 Jeep Grand Cherokee will not start does nothing when you turn the key

Question edited for clarity.
Question moved to model category.

You can't 'cancel it', you have to reset it.

1. Enter your Jeep and press the Lock button on your keyless remote five times in 10 seconds. ...
2. Insert your key into the car's ignition, turn it to the "Run" position and wait for the car's chimes to stop.

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Mar 22, 2022

How to reset the anti theft system - 1999-2004 Jeep ... - iFixit

and videos

https://www.google.com/search?q=2002+jeep+grand+cherokee+security+reset

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Question edited to what I think you meant to say, and get rid of the 'run-on' sentence.

You need to reset the security system because you disconnected the battery which powers the immobilizer.

Press the power door-lock switch on the keyless entry fob. Close the driver's side door. Leave all doors closed for about 16 seconds until the Vehicle Security Light on the instrument cluster stops flashing quickly. When the light flashes at a slower rate, this signifies that the system has been reset and rearmed.

How to Reset the Immobilizer on a Jeep Grand Cherokee and ...

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have a load test done on the battery to check for dead cell.

check battery terminals might have corrosion and jump start is the battery making contact

I suggest check as fisrt step the STARTER.

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ur cylinder lock is going bad...... needs to be replaced

I've got to be reading this incorrectly...You are driving, the engine turns off...you pull off the road? And then without touching the key the engine re-starts, but you haven't touched the key? Or, sometimes you need to sit there for a few minutes and then turn the key to start it?

Try cleaning both battery connectors--both cable ends and posts with a common internal/external brush set available at auto supply dealers. Apply a corrosion inhibitor grease (from the same dealers) liberally to insides and outsides of posts and cable ends. Check the far ends of both cables for tightness and lack of corrosion.

try turning the steering wheel as you turn the key sometimes the locking mechinism will stick

move the steering wheel back and forth and rattle the key with pliers back and forth you may get one more start out of it . Then get it to a shop for a lock cylinder
Good Luck
TEETERMAN