Question about 2004 Ford F150

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Check the battery cables, and have the battery tested.
If you can turn the key to the run position, and the theft light ( wart on the top of the dash with the blinking red LED ) go out, PATS ( Passive AntiTheft System ) is working correctly, it would not start with a push start if the theft system was activated.
Could be corroded terminals on the battery, or your battery is on its way out.
Think this was just bad luck to have the cable or battery issues at the same time as the key route you did.

Posted on Jun 06, 2010

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Buy a key with a chip and get the car/keys recoded.

Posted on Jun 02, 2010


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Posted on Jan 02, 2017

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I lost my only key to my 2000 gmc jimmy does this require a chip or is it just a regular key

No your vehicle doesn't have a chip key . You can just replace the key and lock cylinder . Without a key to copy ! Or the dealer can cut a key using the Vin #

The Passlock™ sensor is separate from the key and lock cylinder. The key and the lock cylinder work together in order to determine if the proper ignition key was used to start the vehicle.
The theft deterrent system has been incorporated into the body control module (BCM). The theft deterrent is provided in order to prevent the vehicle operation if the correct key is not used in order to start the vehicle. The ignition key turns the lock cylinder. The cylinder rotation produces an analog voltage code in the passlock™ sensor. This voltage code is received by the BCM. The BCM compares the voltage code to the previousely learned voltage code. If the codes match, a class 2 message is sent from the BCM to the vehicle control module (VCM)/powertrain control module (PCM). The message enables the fuel injectors.

Feb 07, 2017 | 2000 GMC Jimmy


Cheap key to unlock vehicle

Do you have a vehicle that has one of those expensive micro chips embedded in the key? And because of that expense you have not purchased a spare in case of lock outs, well this cheap trick may save you some money. Just have a regular duplicate key made for about $1.00 from your original. Then if you lock yourself out with the original key inside, this key will unlock the door lock. Remember it will not start your car because there is no chip, but it will get you inside if locked out. It worked for my Tahoe and Grand Marquis. It should work for other vehicles too.

on May 25, 2010 | Chevrolet Tahoe Cars & Trucks

1 Answer

Why does the security light flash even when key is on and engine will not start?

The security light flashing is the indicator. The fuel pump is disabled by the ECU because the immobilizer system does not recognize the transponder chip inside the key.

There could be several causes.
a. Either the transponder chip inside the key is bad, not programmed, or missing
b. The antennae that is located around the ignition lock is bad and/or not reading the transponder chip inside the key.
c. There is a wiring issue between the ECU and antennae.
d. The ECU is bad

You may want to seek out a qualified mechanic or automotive locksmith for help, not all mechanics and/or locksmiths are capable of handling the immobilizer systems on these vehicles. So be clear when discussing your problem to them and make sure they are capable of handling this type of problem.

If the key is not original, check to see if it is a cloned key. Some cloned keys use batteries, when the battery inside the key dies, it no longer communicates with the vehicle. Although it's not common, regular transponder chips can go bad, usually due to physical damage.

An immobilizer transceiver coil tester can be used to test the signal from the antennae at the lock cylinder.

If the ECU is determined to be bad, a used ECU with matching part numbers can be used as a replacement. Contrary to what a dealership or some shops may tell you, all that is required is an immobilizer reset service on the used, replacement, ECU to get it to function with your vehicle. A used ECU and an Immobilizer Reset Service is much cheaper than a new ECU from the dealer. Make absolutely sure that this is the problem before going this route though.

Jun 11, 2014 | 2002 Toyota Sequoia

1 Answer

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

1 Answer

My engine cranks over but wouldnt start we replaced the fuel filter and fuel pump 2 days later the car did it again i use the key i have always used but tried the spare key and i dont know if the car had...

Can be a key problem. If it is not working right, it will disconnect the fuelpump as a safety-measure to prevent stealing your car. (only if it's a key with a chip inside)
Sometimes you can reset your key at the dealer. And please check your battery that's inside your key.

Jun 05, 2010 | 2003 Oldsmobile Alero

3 Answers

Won't start every time, when it does runs rough

test fuel pump pressure seems like its faulty i think your right

Jan 03, 2010 | 1996 Ford F150 Regular Cab

1 Answer

I just purchased a 2004 Sonota and it only has 1 key. Can I get another one from any key dealer?

yes as long as it doesnt have a chip in the key. better yet go to a auto lock place or dealer, it you want to try a regular key shop go for it they will let you know if it has a chip, if they are not sure you will know , when you try to start car it will not start or if it starts it will shut off, good luck.

Oct 28, 2009 | Hyundai Motor 2004 Sonata

1 Answer

'02 Sentra won't start, i.e., dash lights come on but no beep/chi

you need the key with the chip in it. it will have to be programmed to the car. The key and the remote are the only two things that by pass the vss. each trasmit a code that allows the fuel pump and ignition to function.

Jan 14, 2009 | 2003 Nissan Sentra

1 Answer

Ignition will not recognize the key chip and it will not start.

call a locksmith they have a reader and can tell if your key is the problem... it will tell them which keycode is for your vehicle and they can check and see if the key matches also i have a 95 ssei and the pcm was the problem with mine

Jan 06, 2009 | 1995 Pontiac Bonneville

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