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After installing a new ignition switch and having the system relearn the passcode to turn off thet system in my 2002 chevy cavalier, I am no longer able to turn my vehicle on

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  • Cars & Trucks Master
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Can you start it using the key? You might have triggered a security feature! Try disconnecting the battery for 10 minutes, then UNLOCK a front door using a key, then start the engine using a key.

Posted on Apr 24, 2017

Testimonial: "I am able to turn the starter using the key, I have used the 30 minute relearn process for GM theft systems to turn off the theft system, but I will unplug the battery and try your solution thanks for the quick answer, I will follow up in around 15 minutes, will you do the same please? thanks again"

  • 2 more comments 
  • Joseph Montano
    Joseph Montano Apr 24, 2017

    Doesn't start! Thanks for the help, I wonder what is stopping it from starting, I just bought a batter and I just bought a new ignition switch!

  • solver2010 Apr 24, 2017

    Electric fuel pump in the tank, right? Does it run for a short time (1-2 seconds) when you turn the key to the on position, but NOT far enough to crank the engine?

  • Joseph Montano
    Joseph Montano Apr 24, 2017

    yes electric fuel pump, no it doesn't run, it just turns the engine but it doesn't run, as if the theft system is stopping somehow, although I already did the relearn process for the new ignition cylinder already

  • solver2010 Apr 24, 2017

    Try a short squirt of engine starting fluid (1-2 seconds) into the air intake system. If the engine fires (at all), then your whole problem is lack of fuel pressure OR the fuel injectors are not getting triggered on. Can you relieve any fuel pressure at the fuel rails that the fuel injectors get fuel from? If fuel pressure is already PRESENT, then the fuel pump should not even TRY to run!

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Posted on Jan 02, 2017

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1 Answer

How do I bypass the anti theft system on my 2003 CAVALIER ..I put a new steering column in on it and the tdm is acting up and it will not start but will turn over


did you relearn the new ignition to the vehicle if a relearn or flash wasnt done then the vehicles computer is not going to recognize the replaced ignition switch or key

Aug 17, 2015 | Cars & Trucks

3 Answers

Where is the body control module located in 2002 gmc envoy?


It's under your back seat. See here for picture http://www.ebay.com/itm/like/261068608953?lpid=82
Here is the relearn procedure which you have to perform so the new BCM will recognize your key and start the car:
For those vehicles that use a BCM, the BCM can learn the resistance value of the existing key by using the relearn process. In order for the vehicle to start, the BCM (as well as the Passkey module in other vehicles) must identify the resistor pellet in the key, then the BCM sends a password to the PCM. If this password matches the password stored in the PCM, the system enables fuel delivery. So you can see that if either the BCM or PCM are replaced, a relearn procedure is necessary. This same relearn procedure can be used if an ignition key with a different resistance value is used to replace the existing key. Before beginning the relearn, make sure there is a fully charged battery in the vehicle, and both the BCM and PCM are properly powered up and in communication with each other. Now you're ready to initiate the relearn procedure.

1. First, insert the ignition key and turn the ignition switchto the "On" position (Do not start the engine). Leave the switch on for 11 minutes. The security light may flash or be on steady during this 11 minute period. Make sure the light is no longer on or flashing before proceeding to #2 .
2. Turn the ignition switchoff for 30 seconds.
3. Turn the ignition switchto the "On" position (as in step #1) for 11 minutes again.
4. Turn the ignition switchoff for another 30 seconds.
5. Turn the ignition switchto the "On" position for 11 minutes a third time.
6. Turn the ignition switchoff for 30 seconds one final time.
7. Turn the ignition switchto the "On" position one final time and wait 30 seconds.
8. Attempt to start the engine. If the engine starts and runs normally, the relearn is complete. If the engine does not start, check for trouble codes and address them before attempting the relearn procedure again.
You can pick one oif these up for $20 or less at a junkyard. For those vehicles that use a BCM, the BCM can learn the resistance value of the existing key by using the relearn process. In order for the vehicle to start, the BCM (as well as the Passkey module in other vehicles) must identify the resistor pellet in the key, then the BCM sends a password to the PCM. If this password matches the password stored in the PCM, the system enables fuel delivery. So you can see that if either the BCM or PCM are replaced, a relearn procedure is necessary. This same relearn procedure can be used if an ignition key with a different resistance value is used to replace the existing key. Before beginning the relearn, make sure there is a fully charged battery in the vehicle, and both the BCM and PCM are properly powered up and in communication with each other. Now you're ready to initiate the relearn procedure.

1. First, insert the ignition key and turn the ignition switchto the "On" position (Do not start the engine). Leave the switch on for 11 minutes. The security light may flash or be on steady during this 11 minute period. Make sure the light is no longer on or flashing before proceeding to #2 .
2. Turn the ignition switchoff for 30 seconds.
3. Turn the ignition switchto the "On" position (as in step #1) for 11 minutes again.
4. Turn the ignition switchoff for another 30 seconds.
5. Turn the ignition switchto the "On" position for 11 minutes a third time.
6. Turn the ignition switchoff for 30 seconds one final time.
7. Turn the ignition switchto the "On" position one final time and wait 30 seconds.
8. Attempt to start the engine. If the engine starts and runs normally, the relearn is complete. If the engine does not start, check for trouble codes and address them before attempting the relearn procedure again.

Dec 13, 2014 | 2002 GMC Envoy

1 Answer

2002 Chevy Cavalier won't start. The service light


this is a common problem with the passlock system im sure like everyone else you will have to get a new ignition cylinder/switch

Nov 19, 2011 | 2002 Chevrolet Cavalier Coupe

1 Answer

Replaced ignition switch in 1999 chevy cavaliar rs, anti-theft light comes on and stays on and won't allow car to start and remain on or run


You have to do a relearn procedure on the anti-theft system:

Attempt to start the vehicle. Leave the ignition on until the THEFT SYSTEM indicator turns off (about 10 minutes). Turn the ignition switch off. Leave the ignition switch off with key in for about 10 minutes. Attempt to start vehicle.

May 24, 2011 | 1996 Chevrolet Cavalier

1 Answer

1995 chevy cavalier passlock reset


Here is how to do the relearn. 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 nowready to relearn the PasslockTM Sensor Data Code and/or passwords on the next ignition switch transition from OFF to CRANK.
Important: The vehicle learns the PasslockTM 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 PasslockTM Sensor Data Code and/or password.
Thank you for using Fixya and just take you time and follow the instructions above. Good luck

Mar 20, 2010 | 1997 Chevrolet Cavalier

1 Answer

Chevy cavalier wont start randomly! makes one click and a humm sound my lights come on the radio comes on but the car just wont start, ive had battery replaced along with the ignition switch, fuel pump,...


Ok then, from your description and the
make/model/year of the car you have there,
it appears you've reset the VATS.

The car's security immobilizer
reader at the key switch
does not recognize the coded
chip in the ignition key any longer.

You can try to put the key
in the ignition, turn to the on position &
wait at least 10 min like that.
(Do not turn off the key switch before
10 minutes as elapsed!)

Once done, the key is re-programmed and
should allow the fuel injectors to work again.
The car would start now if corrected.

In some cases, the VATS (GM'S VEHICLE ANTI THEFT SYSTEM)
will re learn the code this way, and will then
allow the restart, however if this does not work,
then you can simply tow it to any GM vehicle dealer
to have the service department re code it.

There is a permanent solution though.
Adding the PLJX Self learning Bypass module (59.95)
will bypass the PASSLOCK system in your vehicle
for good. See this at www.PASSLOCK2.com

Good luck I hope method 1 does the trick!

Here is the 30 min relearn:

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.

Dec 22, 2009 | 2003 Chevrolet Cavalier

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

I replaced ignition switch and it will no longer start.


I have a 97 cavalier,and when i changed by switch it activated the factory security system. The resolve i was given was simple, first turn the car over til it starts when it dies do not turn the key off for at least 10 minutes,or until the security light goes off. when this happens the system has reset itself with the new switch. hope this works for you, sometimes it takes 3 times before it works just remember to be patient. Mine reset the 2 time.

Mar 24, 2009 | 2002 Chevrolet Cavalier Coupe

1 Answer

Have 1999 chevy cavalier and will not start no spark new ing modular crank sensor cam sensor and still will not start


i have a 2002 cavalier that had cam crank ignition control mod and coil packs replaced still didnt start so i started in the steering column it turned out to be the acc switch harness one zip tie around switch and harness problem solved

Feb 20, 2009 | 1999 Chevrolet Cavalier

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