Question about 1999 Ford F150 Regular Cab

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Periodically my F150 (V8, manual 5 speed transmission) will not start when I turn on the ignition. The "THEFT" light blinks and the key will not start the engine. I have a brand new battery, alternator and starter all installed within the last month. I've heard it could be problems with the "GEM Box"?

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  • 64 Answers

Sounds like worn ignition switch behind the key. The switch may have been disturbed when the new parts went in. If there is a link ask the mechanic who fitted them to take a look and see if any thing he did has caused the problem they mite fix it up without having to worry. Otherwise the only way to be 100% sure is for the dealers service computer to be hooked up, they tell the full story. Cheers Timo

Posted on Apr 27, 2010

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2000 Ford f-150 4.6L v8 2wd Not Starting, Theft Light Blinking


Mine did this on a 2002 F150 I ended up having to replace the instrument cluster. I ordered a used one online then had the ford dealer program it.

I would also try a spare key if you have one could be the chip inside your key too.

Good luck

Oct 06, 2017 | 2001 Ford F150 Styleside SuperCrew

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I have a f150 2000 v8 triton motor, i drove it the other day it started fine, than I went to start it again and it wouldnt start, than it started when i took to garage they said it was fuel pump and


If the anti-theft light is flashing, I would think it is a problem with the key or the anti-theft system. The system would kill the power to the fuel system.

Aug 29, 2012 | 2000 Ford F150 Flareside SuperCab

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2003 f150 turns over but wont crank, also theft light blinking fast


Usually means the sensor in the lock cylinder is not reading the code in the key.
If the pass key system does not get the right signal from the key the truck will not start.
You might try taking the key off your ring - put it in the lock and turn the switch on - but don't crank it for at least a minute.
There are procedures to reset the anti-theft online - - if you do a search for resetting anti-theft F150 you can read them.

Jul 26, 2012 | Ford Cars & Trucks

1 Answer

May or maynot crank. Anti-theft light blinking really fast. May take ~10mins or more before it cranks. Correct key in ignition. Ford F150 2001 truck.


Do you have another key to try ?
The flashing theft light during the crank is indicating the key is not programmed to the truck.
When you get the no crank no start, do the cluster pass the power on tests OK ? ( i.e. all the indicators light up, and then go out, oil would still be on with the key in the run position with the engine off ).

Nov 15, 2010 | 2001 Ford F150 Styleside SuperCrew

2 Answers

The car wont start, the brake pedal is locked like the anti-theft is active, the anti theft light is flashing when the keys are in the ignition. when i try to turn it on it doesnt turn over, just makes...


TRY REPROGRAM KEY .PUT KEY IN IGNITION SWITCH TURN IGNITION SWITCH ON POSITION 20 SECONDS DONT START ENGINE WAIT 20 SECONDS TURN OFF SWITCH THEN TURN SWITCH BACK ON 20 SECONDS WATCH THE THEFT SECURITY LIGHT BLINKING.WHEN THEFT STOP BLINKING VECHICLE WILL CRANK.IF LIGHT STILL BLINKING.TRY FEW MORE TIMES KEY IN SWITCH ON POSITION FOR 20 SECONDS.MAKE SURE YOU HAVE THE CORRECT CAR KEYS IN SWITCH IF NOT WRONG SET OF CAR KEYS WILL SET OFF THEFT SECURITY SYSTEM.IF KEY RESETTING TRICK DONT WORK.CHECK BATTERY POWER MAKE SURE YOUR BATTERY HAS 12.5 VOLTS AND CHECK SECURITY THEFT FUSE.IF ALL LOOKS GOOD YOUR SECURITY HAS TO BE CHECKED OUT AT THE DEALERSHIP.

Oct 08, 2010 | 2006 Ford Fusion

2 Answers

2002 Ford F150 anti theft engaged, light blinking but wont turn over


Try turning the key from off to run ( do not start ) and wait 5 seconds, to see if the theft light on the cluster goes out.
If it does, check the fuel pump relay and the fuse for the fuel pump, and the fuel inertia switch in the passenger side kick panel.
If the light does not go out, as Ren1221 posted, try another key. If you do not have another key, you will need to tow it to a dealer or repair shop that can perform the erase all keys, and program 2 new keys.

Jul 17, 2010 | 2002 Ford F150 Regular Cab

1 Answer

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.

Jan 13, 2010 | 2002 Ford F150 Regular Cab

3 Answers

Dont know how to reset or bypass gm theft system car is not starting .It tries and quits.


this is one way to reset it :
first make sure the battery is fully charged , then do the following:
key in the ignition but do not crank the motor, just leave it at the
ignition mode for ten minutes ,then turn it off POSITION for 5 seconds then REPEAT again 2 more times. at the 3 rd time youre gonna notice the ANTI THEFT light on dash to blink. when doing the last step , remove key , inserted again and turn on motor , good luck , AJ

May 28, 2009 | 2001 Chevrolet Malibu

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