Engine no crank, anti theft light on steady?

Does the starter turn the engine over?Also let me know if this is what you tried to reset it. If any of these parts are replaced, the vehicle may start and stall for 10 (ten) minutes (LONG TAMPER MODE). If this occurs, the system MUST go through a LONG TAMPER MODE cycle. During this time, the THEFT TELLTALE will be flashing for the full ten minutes. The IPC and PCM require the full ten minutes to complete a learn cycle. The Ignition Key MUST remain in the "RUN" position until the telltale stops flashing or the cycle will have to be repeated.

Here is a guide to help you reset the system by doing a hard reboot.

https://www.2carpros.com/articles/how-to-reset-a-security-system

Please run down this guide and report back

Cheers

the starter does not ingage, no click.
yes the restart senario you describe is correct howevere the anti theft is on even after the other instruement panal lights go out.

I looked up the factory anti theft on your car and when it engages it doesn't disable your starter it's disables your fuel injector's from getting fuel to the engine.So the starter being inop is the problem or a different problem.So let's start by getting your starter working and see if it start's then.First thing i want you to do is have your battery tested and make sure both your battery cable's are clean and tight.After you do that we will start tracing power from your ignition switch to your starter.Here is a description on how your anti theft work's.
The PASSLOCK System is designed to prevent vehicle operation if the mechanical key is not used to start the vehicle. The mechanical key, in normal operation, will turn the PASSLOCK Lock Cylinder. The PASSLOCK Lock Cylinder will relay a Resistance Code (R-Code) to the Instrument Panel Cluster (IPC) . The IPC will determine the validity of the R-Code within a preset time window started from an Ignition Switch input and will send a coded password to the Powertrain Control Module (PCM) . When the PCM receives the correct code, it will allow the Fuel Injectors to operate normally.

cleaned battery tirminals. 12.5v at battery, engine ground pulled 12.2v at engine block. battery holds charge.

The only true way to test a battery is to have it load tested.But we can still do some checking i would just leave the battery in question if it's good.Go to the neutral safety switch and have someone hold the key in the start position and see if you have battery voltage to the yellow wire and then check the purple wire on the neutral safety switch they should both have battery voltage with the key in the start position.Let me know what you find.

I found out the two small wires from the ignition tumbler had broken once I fixed it the car started have not had a problem since, did need to remove the steering wheel and backing plate to do the job. Thanks for your help.

Glad you could get it fixed, that kind of problem can be tough. Please use 2CarPros anytime we are here to help

Cheers

i was driving down the road at a bout 40 miles per hour gaining speed, when all of a sudden the car just died, i tried to start it but it just cranks over and dont start, also the anti theft wont go off, it stays on always and dont blink, i had to replace lock cylinder because my old one jammed up, car worked fine for months and now it isnt working. please help

We cant give out info on how to bypass factory anti theft systems.I can help you figure out the problem though.I have never seen a failed anti theft system to cause the car to die while driving. Check out this guide

https://www.2carpros.com/articles/how-to-reset-a-security-system

Please run down this guide and report back.

i forgot to mention that also if you spray starter fluid into the throttle body it will not run either, i checked spark plugs and they get spark, what can you do to help me figure this out

Thats strange that it wont start on starting fluid and it has spark.Have you checked for codes yet?

it was the computer, i got used one it fired right up thank you.

the car will start and then just shut off. the theft light comes on and i have to wait about 10 minutes till i can start it. is their an easy way to fix this? and if so how?

GM Pass lock relearn

Ignition to "run" position, try to start and let key return to "run" position
Approx ten minutes security light will go off
Turn key "off" and wait 5 seconds
Repeat 2 more times for a total of 3 relearns.
Turn key off, then start it

hi thanks for taking the time to hopefully help me out,
i recently changed my starter, but before that i took the battery out for more than 24 hours, when i finally was done installing the new starter, i installed the battery, then when i went to start the car, it turned over but no start. i noticed the theft system light was 'on', not blinking, i called a few people, and they kept saying the same thing, put the key on for 10 min, then start, but nothing, then i called gm, and the said' start it, but leave it on for 40 min and then turn off and try to start it, but nothing...
What can be causing this problem? please help me
thank you

Turn key on
security light flashing
try to start and let go leave key on
security light flasher for about 10 min
when it stops
turn key off and start car
key needed to be reprogrammed
in some rear cases you may have to do that 3 times total of 30 min

i have the same problem and i have done this whole leave the key forward for ten minutes and when the light stops flashing then start it....i have to do this almost every time i start my car. it has been doing it for a week...so that is way more that 3 times. why isn't my key being reprogrammed?

car dies after 2 or 3 seconds theft light stays on with numerous other lights how do I fix this

check battery condition including load test then try resetting anti theft. see attached.

I have the car listed above z24. The car starts and shuts off due to Pass-lock. My theft light is on, but not flashing, it is solid. I have tried ten minute and thirty minute relearn procedures, but the theft light never goes out, and Pass-lock is still active. What can I do to get my car driveable again?

Hello,

The first thing I need to ask is what your key looks like. Certain cars have the anti-theft chip in the key. I have attached a picture of a key that may look similar to yours. If yours does not have the "pellet" just below the head, let me know.

FYI, I am a locksmith.

If your key has the "pellet" in it, try another key. If you do not have another key, most likely the "pellet" went bad. All the "pellet" is is a resistor chip. The early GM anti-theft keys had only a handful of different resistances. If you have a key cut on the wrong blank, the key will turn, but the car will not start. If you were to have taken the working key to a locksmith, they would have checked the resistance in the key, and used that code to get you the proper replacement.

I have also attached the relearn procedures just to ensure you have the correct information.

I would first take your key to a local locksmith (usually less expensive than the dealer) to have them test the key. If the key is good, we can look into other issues. Please let me know.

William

My anti theft device is activated due to replacing the steering wheel column. How do I reset it?

my problem is my dad is a certified mechanic who has every tool known to man kind and i line 130 miles away. my car is another 40 miles from me. so i am doing this over the phone. here is how i reset mine.

I had a car that would start for two seconds and die, with the Theft Sys light blinking.

The manual was no help. But thank God for the internet where I found a passing comment by someone that made it work. If this is your problem:

1. Attempt to start the car, let it stall, but DO NOT turn the key off! Leave it in RUN.
2. Wait 10 minutes or until the Theft Sys light glows steady instead of blinking.
3. Do not turn the key off, but start it immediately.
4. This should reset your Passlock system.

If this doesn't work it means you have a broken wire up at the ignition switch which is common. Here are diagrams to help

This guide can help

https://www.2carpros.com/articles/how-to-reset-a-security-system

Check out the diagrams (Below) Please let us know what happens.

Okay, I am working on the car listed above. It is a dirt track race car it has been stripped they were running it last year the last time they had it out the anti theft light kicked and the car shut down. they have no clue what the deal is so they hired me to get it running. i am replacing the wiring harness today. my truck had that anti theft messed up and shut my truck down. I wired a toggle and push button start and it bypassed it on this car, i did the same but the wiring is so messed up I I think that is the issue. It cranks no spark, gas, nothing, no fuel pump. anything if you could please give me the best advice in the easiest and quickest way to get this engine fired up and running today I would greatly appreciate it.

Hello,

There are two small wires that go to the ignition switch tumbler that break causing the security light to come on. I would remove the steering wheel and top plate to see if I am right.

Here are diagrams to help you get the job done.

Check out the diagrams (below).

Please let us know what you find. We are interested to see what it is.

Cheers, Ken

Replaced computer,car starts then dies right away

The new computer has to relearn the security codes.

Disconnect the battery and hold the cables together for about 30 seconds then reconnect the cables before performing the procedure.Read it carefully if done incorrectly it won't work.If it helps let me know.
Turn ON the ignition, with the engine OFF.
Attempt to start the engine, then release the key to ON (vehicle will not start).
Observe the SECURITY telltale, after approximately 10 minutes the telltale will turn OFF.
Turn OFF the ignition, and wait 5 seconds.
Repeat steps 1 through 4 two more times for a total of 3 cycles/30 minutes (the vehicle is now ready to relearn the Passlock™ Sensor Data Code and/or passwords on the next ignition switch transition from OFF to CRANK).
Important
The vehicle learns the Passlock™ Sensor Data Code and/or password on the next ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle.
Start the engine (the vehicle has now learned the Passlock™ Sensor Data Code and/or password).
With a scan tool, clear any DTCs if needed (history DTCs will self clear after 100 ignition cycles).

I forgot to ask but has your new PCM been flashed yet?

y did you replace the cpu?if for the security lights on i would have tested the ohms reading on the key.then insert the key in the cylinder.then youll see a orange harness with 2 white wires.go to the connecter at the base of the steering column.read the ohms reading at the connecter on the 2 white wires.it should read the same as the key.or you will need to replace the key cyl.to repair

This is a Passlock system. It doesn't even have resisters in the keys.

Hi,
I have a 2004 Chevrolet Cavalier, 47,000km with a 2.2 engine.
My problem is concerning the anti theft system.
I use my remote to lock and unlock the car. Through the night my alarm started sounding and the lights flashing for no apparent reason. I unlocked the car with the remote, checked all the doors, started the engine and the locked it again.
About 20 minutes later it did the same thing and then again about 15 minutes later. As I needed to get some sleep. I then just locked it by the power door locks.
Any ideas whats going on here, or if there is anything I can try to resolve this myself.

This sounds like the drivers door latch needs to be replaced because the micro switch inside goes bad. But to be sure let try to reset the system first by following this guide.

https://www.2carpros.com/articles/how-to-reset-a-security-system

Please run down this guide and report back.