I have a 2010 jeep liberty, The horn started going off yesterday repeated all day. Now, my alarm system is going off. I really don't not what to do at this point. I really do need help.

That is a whole lot of issues that needs an auto electrician and a pro grade scan tool computer. We have a pro electrician here @Jeff Armer and hopefully he will chime in. Sounds like a communication issue with BCM and ECM which I think is combined into a TIPM.

https://www.google.com/search?q=jeep+liberty+p0501

If you disconnect the battery, you have to reset the anti-theft system.

https://www.google.com/search?q=jeep+liberty+tipm+reset

How do i reset the Jeep Liberty alarm? - Vehicle History

https://www.vehiclehistory.com > questions > how-do-i-...
To reset the Jeep Liberty alarm, press the control door-lock button on the keyless entry fob. Open the side door of the cab. Leave all doors closed for around ...
3 answers · Top answer: If You want to reset the alarm on the Jeep Liberty then You will need to fol

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If it did ever work for you, then the problem should be the horn itself, the wiring to the horn, or the sensor/computer that tells the horn to blow.
Otherwise, the whole system may be defective.
God bless your efforts.

gotta love bad advice,
KJ car
and you failed to scan the PCM, so you really dont know
what system in the car set off that alarm of the 3 or 4 possible.
so, ill not guess.
to fix cars or advise, one must know how this car works.
and Tralaina dont.
the 05 KJ , FSM book is free to view. linked below'

the first answer is pull the horn RELAY,
do not pull FUSE JB F11, this kills other vital systems.
unplug horn actual or the relay (for a nice stop gap fix)
long gap, (LOL)? fix sure.
scan the PCM and win.

the horn switch activates the horn relay
as does the BCM.
but wait what causes BCM to honk horn.,
lots of things.
alarm, inputs WRONG
key fob door lock access. controls , gone wild.
and more, i dont have all programming of BCM, facts.
but is not important , what does matter is SCANNING the PCM.

YOU will get DTC errors, and now you know, WHY and WHAT
set off the alarm.

the JB is drivers cab box. J11 will kill
Pulled
sun roof
and power windows. (my guess is that is important to you)
if you pull that top fuse in PDC box, lots more dies. lots.

It is electric.It is mounted in the center on top off the air plenum. You have to remove the dash to get to it. Last one I did was the heater core. 2003, had to remove the dash out of the vehicle, drop the steering column and remove the air plenum. All day job. You need a manual, lots of nuts, bolts, and screws to remove.

it is stuck in anti theft mode you try disconnecting battery and see if it helps. You will have to reprogram as well.

If the battery is good then you have a defective door ajar switch, have the dealer keep the car until it can be confirmed that the horn is going off and it is the alarm system, they can scan it and see what the cause is.

Open the door and immediately place the key in the ignition, that will shut off the alarm. The batteries in the Keyfob are probably dead and need to be replaced. You will see that the keyfob can be opened, though do it carefully, and you can replace the batteries. This will fix the remote. You may also have a valet button in the car which temporarily disables the alarm and will keep the alarm from sounding if the door is opened.

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Your alarm has been set off, once this happens the engine can not be started until the alarm is clear. It pretty much disables your ability to drive the car just in case it would be stolen. The dealer will need to check out to see if the alarm malfunctioned or ? what caused it to go off.

you probably just set off the alarm system

If you look in the jeeps owners manual for the keyless remote section, you can program the horn to honk or not honk when you lock the doors.