Question about 2005 Hyundai Sonata

1 Answer

Alarm goes off when trying to jump

The alarm on my 04 sonata is going off when im trying to jump it what do i do?

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  • quentotito Apr 21, 2009

    yes. the key fob isnt working either

  • quentotito Apr 21, 2009

    thanks ill try it. also i got the codes read n it says i either need ignition coil or fuze it kinda jumps when idle does that sound right?

  • quentotito Apr 23, 2009

    what is the earth? and the alarm doesnt stay off when i put the key in.

  • yadayada
    yadayada May 11, 2010

    earth is the battery negative.

  • yadayada
    yadayada May 11, 2010

    One problem at a time on the free forum

  • yadayada
    yadayada May 11, 2010

    use the actual key

  • yadayada
    yadayada May 11, 2010

    is the alarm factory? if so reset it by locking and unlocking passenger or drivers door with the key

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  • 9 Answers

Keep putting the earth on and off it might take a lot of times to cause it to reset you need charge in the battry and has to be done fast till you here a chime

Posted on Apr 21, 2009

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1 Answer

Trying to start my 04 ls and the alarm goes off, why?


Try jump starting, charging or at least testing the battery. I had a similar problem when I first got the car off the lot. It had been sitting a while in the cold so when I test drove it they jumped it and it started. I kept it running for 10 minutes after the test drive and it started again to get it off the lot. I got it home and it wouldn't start. It had enough juice to have the lights, alarm and things like that to go, but not enough to get the car to turn over. Whenever I tried, it would make the alarm go off. Give it a try, hopefully thats all it is

Oct 13, 2012 | 2004 Lincoln LS

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When i try to start me 2008 sonata the alarm goes off and the engine will not turn over. what can i do?


Your Sonata is equipped with a "Keyless Entry & Burglar Alarm" system. When the Burglar Alarm is activated, it KILLS the starting system through the used of a relay called the "Burglar Alarm Relay". This mode prevents engine starting with the key.
Solution #1
Disarm the system with the Keyless Remote (key fob) If you don't have this remote (or its battery is dead) replace the battery & try disarming again.
Solution #2
Enter the vehicle & insert the key in the ignition and turn the ignition switch to 'RUN'. Wait 3 to 5 minutes until the alarm stops. You should then be able to start the engine.

Have a qualified/certified Hyundai Service Technician properly diagnose this issue.

Sep 07, 2011 | Hyundai Motor 2004 Sonata

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I have a 2003 hyundai sonata and i dont have the remote for the stock alarm. My alarm keeps going off and my car wont start. I bought a new battery and even tried the key in the door still no luck.....


The 2003 Sonata is equipped with a 'starter KILL' burglar alarm system with disables the starting system (using a N/C 'contacts' configuration instead of a N/O contacts configuration). N/C=Normally closed, and N/O=Normally open contacts. When the alarm goes off with a MY Sonata, the only way to DISARM it is with the key fob (remote) originally programmed for it (unless you purchase a new remote & have it programmed for the vehicle at an authorized Hyundai Service Department). NOTE: So long as the keyless entry & burglar alarm system is functioning/operating normally, the alarm will keep going off and the STARTER KILL function will still prevent you from starting the vehicle. One option is left without purchasing a new remote and having it programmed.
1. When the alarm goes off, get into the vehicle and insert the ignition key into the ignition.
2. Turn the key to the 'RUN' position (NOT the ACC position) and wait for the alarm to STOP (usually about 3 to 5 minutes).
3. The engine should then start using the ignition key.

If this procedure doesn't work, the problem will need further diagnosis by a qualified/certified Hyundai Service Technician.

Hope this helps

Aug 27, 2011 | 2003 Hyundai Sonata

1 Answer

'04 sonata cranks for a while before starting, once warm the problem goes away. Is it the fuel pump, filter, or something else?


good question but you will have to do some testing first,, get ahold of a fuel pressuer test gaudge and test the key on fuel pressure it should be around 55lbs but each car veries so make sure to check with a repair manual to see what the exanct psi should be. once you test that then lets go from there.. put more comments up once you find out a little more and we can trouble shoot it together

Aug 25, 2009 | Hyundai Motor 2004 Sonata

1 Answer

2004 Sonata Alarm


Yes!... reset the alarm with the fob!

Aug 02, 2009 | 2005 Hyundai Sonata

1 Answer

Alarm Issues


I have been having this same issue for the past 6 months. So far no one can give me an answer that solves the problem. I have done several things unsuccessfully 1) changed the battery (still happens) 2) flipped the valet toggle switch under the steering column (still happens) 3) I lock the doors using the automatic lock button on the driver and/or passenger door (the alarm will not self-activate and go off, but this still doesn't solve the root problem with the alarm)

Mar 28, 2009 | 2005 Hyundai Sonata

1 Answer

Alarm won't turn off


There is a silver toggle switch on the lower dash on the left side...it's called a "valet switch" shuts the whole system off!! Took me 3 months and 100's of calls to dealers etc....lol

Dec 16, 2008 | 2000 Hyundai Sonata

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