How to bypass the anti-theft system in a 2006 Chevy Cobalt

A nice simple answer, you can't. Think of it this way, the car doesn't know you are the owner, and it is there to stop exactly what you are trying to do. You have two computer ECM and BCM, plus the antitheft module and a number of sensors all trying to stop you. All you have to do is the re-learn procedure. Plan B is an auto electrician or alarm / radio installer or auto locksmith.

30 Minute Re-Learn Procedure

1. Turn ON the ignition, with the engine OFF.
2. Attempt to start the engine, then release the key to ON (vehicle will not start).
3. Observe the SECURITY telltale, after approximately 10 minutes the telltale will turn OFF.
4. Turn OFF the ignition, and wait 5 seconds .

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Nov 11, 2011

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How do I reset my 2005 chevy cobalt anti theft system?

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Won't start, theft lock symbol on - Cobalt SS Network

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Jul 9, 2008 - To reset it, you need to stick the key in, turn it to start, and let the key sit in the ON position for 10 minutes, the light will start to ...

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Our Automotive Expert gives the correct answer. AI Auto Bot Answers and spam deleted.

Jeff Armer Aug 26, 2023

There is no bypass, you need code to unlock it. Dealer!


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I keep telling people you can't bypass the anti-theft system, you have to fix it. Pass Key 3 is clever, and I remember from our professional auto electronics wizard @Jeff Armer, there are a number of different Pass Key types.

You need an auto electrician, or an auto locksmith / alarm installer with a bi-directional pro grade scan tool computer. You can't fix this yourself and you don't want to be on the highway doing 70 when the engine turns off. Also bypassing stuff with bit of wire gives a real chance of damaging very expensive modules.

Question edited for clarity and correct name of vehicle.

You can't bypass it Cherie, it involves transponder chips, receivers and the engine computer (ECM).. The anti-theft system is there to stop theft of the vehicle, basically what you are trying to do. You have to fix the system, not find a way around it. This is the reset. As long as you battery is good and fully charged, it should only need doing once.

Just leave the key in the run position and the "Theft System " light on the dash will be flashing. Leave the key on for about 10 minutes and the light will stop flashing and go on solid. Then the theft system is disable.

how to over-ride anti-theft so car will start? (Chevrolet Cavalier)

https://www.google.com/search?q=chevy+cavalier+theft+system+bypass

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You could take it to a qualified shop an have it repaired right or yor could do what this guy suggests Chevy GMC Passlock II Bypass

Can't be bypassed. Do a reset for the key. Ten minutes on thirty seconds off. A relearn is three times this. Try to start after. Once started, you need to have it scanned for security codes. To find out why it keeps loosing the programmed key.

The anti theft is in the computer program. You may have to have it reflashed at the dealership.

Try using your spare key to lock and then unlock the car. This may reset the anti-theft system. This applies to the alarm as well.

If the light is on it means you have a security concern and will need a scan tool to find out the code.You will need a gm scan tool or one that can read body contol module/theft module data.

Radio code is specific for each and every car. It is specific like anti theft code.

So you can get it by providing your VIN# and registration details in authorised dealership.Nobody else can provide you. If anybody can provide you that , then there is no meaning of security for your car.