Jeep wont start or turn over disconnect the battery then reconnect and it starts but only once

The rear gate is the rear door at the back of the vehicle..Open and shut it to make sure it is latched...Then wear safety glasses disconnect negative battery cable to clear codes ..reconnect then try to start it..You shouldn't have the code once gate is shut however disconnecting the battery will erase all codes...Also make sure both battery cables are tight....

you can try resetting it by disconnecting battery ,wait 30 sec then reconnect two things make sure you have drivers side window all the way down and the keys in your hand it may set off auto locks (I have seen it happen)once you reconnect battery alarm will go off and lights will flash at this point put key in drivers side door and turn it to open close 3 times with out opening door that should do it.

Got any phone charges or other electronics in the vehicle? Disconnect them and try the remote. Those can cause interference.

Two options you can try. 1st, lock and unlock each door manually with the key including the trunk, then try to start vehicle. 2nd option, with vehicle battery, turn the ignition to the 'on' position, reconnect the battery then try to start the car.

Try closing the doors then hook up jumper cables, let it sit for a couple of minutes with cables hooked up and other vehicle running. Then try to use key to turn off alarm before opening door. Then try to start it.

In the PCM is where the Horn Relay is. It's location should be annotated on the underside of the cover you pulled off to gain access. One way to determine if it is the Relay or not is to find a similiar Relay (shape and size) and switch them. If this fixes the Horn problem it is the Relay and should be replaced.

I just replaced my battery today and noticed a switch that the battery sits on. I havent looked in to it but I would guess the car wont start or maybe even not turn over it it thinks the battery has moved from where it belongs. Hope this helps some.

Need more info. Does it turn over and not start? Does it not turn over? Have you tried to jump start it?

Alarm Module Reset Procedure
NOTE: This information applies to a Vehicle Theft Security System (VTSS) that was armed when the battery was disconnected and reconnected.
When the armed VTSS senses that the battery has been disconnected and reconnected, it enters its power-up mode. In the power-up mode the alarm system remains armed following a battery failure or disconnect. If the VTSS was armed prior to a battery disconnect or failure, the system will have to be actively or passively disarmed following a battery reconnection.
The power-up mode will also apply if the battery goes dead while the system is armed and battery jump-starting is attempted. The engine no-run feature will prevent the engine from starting until the alarm system has been actively or passively disarmed.
Passive disarming of the Vehicle Theft Security System (VTSS) occurs when the vehicle is unlocked using the key to unlock either front door or the lift gate. Active disarming of the VTSS occurs when the vehicle is unlocked by depressing the Unlock button of the Remote Keyless Entry (RKE) transmitter.
Once the alarm has been activated (horn sounding, lights flashing, and the engine no-run feature), either disarming method will deactivate the alarm.
Depressing the Panic button (if equipped) on the RKE transmitter will also disarm the VTSS, but the horn will sound and the lights will flash for about three minutes as part of the Panic feature. The horn and lights can be stopped by pressing any of the RKE transmitter's buttons or driving the vehicle above 15 mph.

Anytime you disconnect and reconnect your battery, the factory alarm will arm upon reconnection and the truck will not start. You have to close your doors, then manually lock and unlock the door with your key. This should turn off the security system and you should be able to start the truck.