Question about 2004 Ford F150

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My 2004 F150 will not start. When I turn the key the anti theft light just flashes. The key has not lost its code. I tried a 2nd key

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  • eaglebase929 May 09, 2009

    I have tried to start the vehicle in nuetral. No luck. The anti theft light just flashes rapidly. I have check all the obvious stuff like battery cables and connections.

  • KEN LaPOINT
    KEN LaPOINT May 11, 2010

    Have you tried adjusting the gearshift level to Neutral? Sometimes the neutral safety switch on the gearshift is out of alignment. Try neutral and also in park...just lift the gearshift up and see if you have success. let me know if you still need help with this.
    KEN

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The key has lost it's code, there is a chip in the key that communicates with the security system that the correct key is in the ignition and that the vehicle is allowed to start.

if you have any other keys on your key ring remove these and try again.
if no start and light still flashes the computer will need reprogrammed to accept the key.
the dealer can do this in like 10 -15 minutes usually.

Posted on May 14, 2009

  • juggernautxt
    juggernautxt May 14, 2009

    anytime that light flashes it is a security issue and the computer is not recognizing the key.
    if you have a secondary alarm installed it is best to remove it or have it removed as they also interfere with this security system.


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Aug 29, 2012 | 2000 Ford F150 Flareside SuperCab

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2004 ford explorer will not turn over with key but remote starter switch makes it turn over


Its a good possibility that the Anti-theft is interferring with the circuit. If you have an extra ignition key, use that in case the password chip in your regular FOB has detriorated.

There is a brake sensor which is on the upper brake pedal. It interlocks with the starter to prevent starting without having your foot on the brake pedal. Check your brake lights for operation. If the brake lights stay dark with your foot on the pedal, the switch is broke or knocked out of position. A common problem.

Next, there are small wires for the starter solenoid. You can use a test light on one removed wire and ground the test light to the vehicle, the other end in the small wire. Turn the keyswitch to start, with brake pedal pressed and see if it lights up. If it does light up, the starter solenoid may be bad.

Battery level. Ford Anti-theft and some say Battery-saver, can cause both starting and charging problems. A fully charged battery can be at 13.2V- 13.6V. When Ford systems detect low voltage it can activate the Anti-theft, battery-saver, and even disconnect the charging system to allow the battery to completely drain. In some cases the Anti-theft drops starter voltage to around 7V so the starter will not spin. Have the battery tested.

I know of 2004 trucks that were jump started and showed charging, then after 5-10 minutes they lost the charging system. Some people lost the charging system at 70MPH and drove until they stalled. All because of the automatic features built into the trucks. A new battery fixed the problem. Your problem could stem from this.

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Car will not start- will crank- anti-theft light flashes - turn switch to on for 10 min. when light stops flashing - turn switch to off - then it will start. Changed to a new switch - worked or started for...


try a diffrent key,your extra one.Could be the micro-chip inside is not comunication with anti-theft-.This happened to me.I used the spare set for a few days .then the other key started working again

Jun 28, 2011 | 2004 Chevrolet Malibu

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Turn ignition key and motor starts up, next day turn ignition key and motor just turns over and wont start. could it be anti theft problem its a 2002 f150 4 wheel drive with 4.6 liter


This could be caused by either a faulty Crank Shaft Position Sensor or the anti-theft system. Try put key in, turn to ON position for EXACTLY 10 minutes, As SOON as anti-theft light shuts off or stops flashing, then IMMEDIATELY start the engine.

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On start flashing theft light on 02 windstar


I just had this same thing happen with my Ford Taurus, and it turned out to be a bad key. The repair shop switched back and forth between two different keys we had with us 10 or 12 times, and it always started with the good key, never with the "bad" key. They said if the theft light is flashing quickly, that means the anti-theft system is engaging. If the anti-theft light just lights up, that is normal.

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