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Car won't start, theftlock system seems to be why need radio passlock code which I don't have being i just bought the car 6mos. ago. the light for radio doesn't work can I change just the bulb? How do i retieve code?

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  • Anonymous Oct 19, 2008

    car lock theft system, car won't start

  • Anonymous Oct 19, 2008

    car won't start theft lock system

  • tomatosplat Jan 11, 2009

    same problem on '02 Alero. Light is blinking on something called "TheftLock"
    and nothing happens when ignition is actuated.


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5 Suggested Answers

  • 80 Answers

SOURCE: 2004 pontiavc grand am will not start

often the battery is good enuf to run accessories but not start. check the battery voltage,maybe try a jump start b4 you go replacing stuff

Posted on Jan 20, 2009

alicantecoli
  • 22041 Answers

SOURCE: Can I bypass the Passlock security system?

never heard of this happening before ,sounds more like the code reader behind the steering lock is playing up.If it is then its dealer only,have a funny feeling this could be an expensive repair.Sorry i couldnt be much more help but this fancy electronic stuff is designed to stop general mechanics like myself from doing repairs.

Posted on Mar 16, 2009

  • 10 Answers

SOURCE: cadallic 2002 radio reads locked theftlock active

You need to enter a code from the cadilac dealer

Posted on May 02, 2009

  • 245 Answers

SOURCE: theftlock radio code

you have to get this from the dealer no other way

Posted on May 22, 2009

  • 40 Answers

SOURCE: Problem starting my 2002 Chevy Malibu because of

the only way to get by this is to install a remote starter had the same problem with my grand am it worked no more problem.

Posted on Jun 04, 2009

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2 Answers

Safelock on 2006 Pontiac Torrent. Randomly prevents starting. Seems to reset after a day or so. Is there a way to disable


It is the passlock system not safelock An you can't just disable it . It is software program into the BCM - body control module an the PCM - powertrain control module .Simply disconnecting the wires from the ignition to the BCM will render your vehicle useless . If an when the security symbol light is on you need to have it checked for DTC'S - diagnostic trouble codes . A GM dealer ,Chevy , Buick , Cadillac etc.... we know Pontiac is no longer around. Everything will work except the PCM will not let the fuel injectors work .
Passlock?"¢ System
The theft deterrent system has been incorporated into the body control module (BCM). The theft deterrent system 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 allows the lock cylinder to rotate. 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 previously learned voltage code. If the codes match, a serial data message is sent from the BCM to the powertrain control module (PCM). The message enables the fuel injector operation.
The design of the Passlock?"¢ system is to prevent vehicle theft by disabling the engine unless the ignition lock cylinder rotates properly by engaging the correct ignition key. The system is similar in concept to the Passkey system. However, the Passlock?"¢ system eliminates the need for any key mounted components. The components of the Passlock?"¢ system are as follows:
?€¢
The ignition lock cylinder


?€¢
The ignition switch


?€¢
The Passlock?"¢ sensor


?€¢
The BCM


?€¢
The security indicator


?€¢
The PCM

Jun 24, 2016 | 2006 Pontiac Torrent

1 Answer

Gm delco theftlock radio wont turn on?


You have to enter the theft code which was set into the radio. The owners manual will tell you how AS LONG AS YOU HAVE THE CODE. If you don't have the code, any GM dealer will help you out and call in to get your code. They will want to make sure you own the vehicle.

Jul 22, 2012 | Cars & Trucks

1 Answer

2004 GRAND PRIX RADIO THEFTLOCK REMOVE


You need to enter the unique code for your radio that was given to the orig owner. If you do not have that you will need to see the GM dealer.

Jun 25, 2012 | Cars & Trucks

1 Answer

Took radio out now truck wont start.security light stays on,won't flash at all. tried deactivating passlock can't, also domelight,hd lights,l/door lock, keyless kemote not working. all this fr


Ypur security system is armed, if you was try unlock procedure from owners manual and wont work, its possible that you will need visit your dealer to reprogramming.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Feb 24, 2012 | 2002 Chevrolet Silverado 1500

1 Answer

Unlock radio need code to lock radio mufflerman08@yahoo.com


Your '02 is too new to unlock on your own.

There are 2 types of GM Theftlock, Theftlock I and Theftlock II. The Theftlock I is found in pre 2000 vehicles, and Theftlock II is in the later models.


Theftlock I - Uses a volatile user settable code that is input through the key pad on the front of the Radio. If the power is lost (dead battery etc.) the code is gone and must be re-entered for the radio to work. But with the correct procedure the owner can unlock it.

Theftlock II - Uses an EPROM (erasable/programmable read only memory) or a PROM (the difference is you can not alter the prom once it is programmed).

In either case the code is burned in and holds even when the power is lost. With Theftlock II the radio is married to the vehicle by way of the VIN. When the vehicle is started the computer compares the number in the radio with the VIN in the body control module. If they match, the radio works, if not the radio displays LOC and you are finished, there is no easy way around it. The radio will not work until you make a trip to the dealer.


The dealer will use a TECH 2 scanner to change the VIN stored in the radio. The radio does not need to be removed (for the serial number or any other nonsense). The technician just plugs into the computer and resets the VIN in the radio.

Thank you for using Fixya and you may want to try pulling the fuse to your radio for 2 min and then reinstalling it. This may reset your radio and have the ECM recognize the radio matching VIN number to the Trailbalzer.

Jul 15, 2010 | 2002 Chevrolet TrailBlazer

1 Answer

I need a radio code to unlock gm part 10356164


Your '05 is too new to unlock on your own.

There are 2 types of GM Theftlock, Theftlock I and Theftlock II. The Theftlock I is found in pre 2000 vehicles, and Theftlock II is in the later models.


Theftlock I - Uses a volatile user settable code that is input through the key pad on the front of the Radio. If the power is lost (dead battery etc.) the code is gone and must be re-entered for the radio to work. But with the correct procedure the owner can unlock it.

Theftlock II - Uses an EPROM (erasable/programmable read only memory) or a PROM (the difference is you can not alter the prom once it is programmed).

In either case the code is burned in and holds even when the power is lost. With Theftlock II the radio is married to the vehicle by way of the VIN. When the vehicle is started the computer compares the number in the radio with the VIN in the body control module. If they match, the radio works, if not the radio displays LOC and you are finished, there is no easy way around it. The radio will not work until you make a trip to the dealer.

The dealer will use a TECH 2 scanner to change the VIN stored in the radio. The radio does not need to be removed (for the serial number or any other nonsense). The technician just plugs into the computer and resets the VIN in the radio.

Thank you for using fixya and keep us posted.

Jul 10, 2010 | 2005 GMC Yukon

1 Answer

I NEED TO UNLOCK MY STERO IN A 2004 TAHOE


There is no actual "security code" in the radio as in past model years. The newer theft deterrent system utilizes the class 2 serial data to determine if the radio is in the appropriate vehicle...in other words it compares the VIN it has stored in it's memory with the VIN of the other modules (body control and PCM) in the vehicle to "check" to see that it's in the correct vehicle.

Each time the radio receives the "run" power mode message, it compares the VIN information it has stored to the VIN information received from a module on the class 2 serial data circuit responsible for transmitting that information. If a mis-match occurs, the radio display will indicate to the user the radio is locked. Once this takes place the radio will not respond to any buttons/commands and becomes inoperative. But the dealer can reestablish the radio into a different vehicle with a scanner.

There are 2 types of GM Theftlock, Theftlock I and Theftlock II. The Theftlock I is found in pre 2000 vehicles, and Theftlock II is in the later models.


Theftlock I - Uses a volatile user settable code that is input through the key pad on the front of the Radio. If the power is lost (dead battery etc.) the code is gone and must be re-entered for the radio to work. But with the correct procedure the owner can unlock it.

Theftlock II - Uses an EPROM (erasable/programmable read only memory) or a PROM (the difference is you can not alter the prom once it is programmed).

In either case the code is burned in and holds even when the power is lost. With Theftlock II the radio is married to the vehicle by way of the VIN. When the vehicle is started the computer compares the number in the radio with the VIN in the body control module. If they match, the radio works, if not the radio displays LOC and you are finished, there is no easy way around it. The radio will not work until you make a trip to the dealer.

The dealer will use a TECH 2 scanner to change the VIN stored in the radio. The radio does not need to be removed (for the serial number or any other nonsense). The technician just plugs into the computer and resets the VIN in the radio.

Thank you for using fixya and good luck. you might get luck by removing the fuse toy our radio for 5 min and reinstalling it, this will reset the radio to default and all you need to do is reset the clock and radio presets.

Jun 15, 2010 | 2004 Chevrolet Tahoe

1 Answer

Monte carlo radio is theftlocked.


you need the unlock code from the manufacturer. I had a radio lock up but the company had me send it to them for them to unlock. i had to prove that i bought it and it was not stolen.

Jan 30, 2010 | 2001 Chevrolet Monte Carlo

1 Answer

Just replaced steering coluim in a 2002 chevy cavalier and the car won't start how do i get the theftlock code


Ignition keys relearn takes about 30 min to do. 30-Minute Learn Procedure 1. Turn ON the ignition, with the engine OFF. 2. Attempt to start the engine, then release the key to ON; the vehicle will not start. 3. Observe the SECURITY tell tale light. After approximately 10 minutes, the light will turn OFF. 4. Turn OFF the ignition switch, and wait 5 seconds. 5. Repeat steps 1 through 4 - two more times - for a total of 3 cycles of 10 minutes. 3x10 = 30 minutes. The vehicle is now ready to relearn the Passlock Sensor Data Code and/or passwords on the next ignition switch turn from OFF to CRANK Important: Turn the Ignition Switch OFF. 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. 6. Start the engine. The vehicle has now learned the Passlock Sensor Data Code and/or password. 7. With a scan tool, clear any DTCs if needed. History DTCs will self clear after 100 ignition cycles. Without a scan tool you may have momentary starter interruptions while history clears itself.

Nov 22, 2009 | 2002 Chevrolet Cavalier Coupe

1 Answer

Hello, I had to change the battery in my '95 Oldsmobile Cutlass Supreme not realizing there is the Theftlock system to disable it. I have no idea how to disable the Theftlock system. The display now reads...


There is a factory set code that you will need the dealer to pull and call the radio companies help line to get the unlock code all the dealers in my area do this free for GM customers.

Oct 04, 2009 | 1995 Oldsmobile Cutlass Supreme

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