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I have an 01 impala, i have had trouble with the car not starting and people and what i saw on the internet suggested the passlock system was on the fritz and told me that i had to let the system reset itself for 10 mins. Last weekend i had the same problem once again but this time after 10 mins the car still will not start and noticed that the red security light on the radio is not flashing while its reseting like all the information that ive found said it would but just stays off all the time. The only time the light flashes is before I turn the key from the off/lock position. Could this still be the passlock system or something completely else?

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  • LCube81 Nov 13, 2010

    ok next question, is the passlock system in the ignition mechanism or somewhere further in the dash?

  • LCube81 Nov 13, 2010

    I have an 01 impala, i have had trouble with the car not starting and people and what i saw on the internet suggested the passlock system was on the fritz and told me that i had to let the system reset itself for 10 mins. Last weekend i had the same problem once again but this time after 10 mins the car still will not start and noticed that the red security light on the radio is not flashing while its reseting like all the information that ive found said it would but just stays off all the time. The only time the light flashes is before I turn the key from the off/lock position. Could this still be the passlock system or something completely else? And if so where is the passlock module located?

  • LCube81 Nov 14, 2010

    I've checked in the ignition switch and all of the contacts seem to be fine and the ones that looked iffy I cleaned them up

  • LCube81 Nov 14, 2010

    Ok tried that and the security light on the dash does flash off and on, tried the reset process and still won't start. It's doing like you said everything works when I turn the key to on except it won't start. So I'm guessing its the passlock, where is it located and how hard is it to change

  • LCube81 Nov 14, 2010

    Yea if you could post the removal and replacement for the passlock. Is it hard to do or hare to find in the dash?

  • LCube81 Nov 15, 2010

    awesome! I got the ignition cylinder out and I see the passlock chip on top of it. When replacing will I get a whole new ignition cylinder with new key tumblers in it and new keys or will I just have to use my original key and tumblers?

  • LCube81 Nov 15, 2010

    ok luckly autozone here had a new one installed it, ready to go through the relearn process. Just want to make sure about this part, the security light that flashes will be the one on the dashboard and not the red one on the radio correct?

  • LCube81 Nov 16, 2010

    I've replaced the ignition cylinder with the passlock chip on it but either I'm not doing the reset correctly or that wasn't the problem

  • LCube81 Nov 17, 2010

    I tried the reset and didn't work the first time so I tried it again last night and when I had the key in the on position for the second time the security light wasn't flashing but was staying on constantly. Could I be doing it wrong or could something else be wrong

  • LCube81 Nov 19, 2010

    Well I tried again this morning, I let the car sit 10 mins and took the key out for 10 secs and I put the key back in turned to on and the security light was not flashing just staying on but I noticed everytime I opened the drivers door the radio would turn on really loud with a headphone symbol on the radio display. I shut the door just to see if it was a one time thing but it happened everytime I opened the door. I went ahead and waited the 10 mins and when I came out the car was dead and I could hear a clicking sound like the gauges make when I turn the key to on. I turned it off and pulled the key out but kept hearing the clicking nonstop. I changed the battery when all this started 2 weeks ago after the car wouldn't start the first time, i just took the battery to get checked and it has a full charge and is still good. Does this sound like anything youve ever come across before?

  • LCube81 Nov 19, 2010

    Well I tried again this morning, I let the car sit 10 mins and took the key out for 10 secs and I put the key back in turned to on and the security light was not flashing just staying on but I noticed everytime I opened the drivers door the radio would turn on really loud with a headphone symbol on the radio display. I shut the door just to see if it was a one time thing but it happened everytime I opened the door. I went ahead and waited the 10 mins and when I came out the car was dead and I could hear a clicking sound like the gauges make when I turn the key to on. I turned it off and pulled the key out but kept hearing the clicking nonstop. I changed the battery when all this started 2 weeks ago after the car wouldn't start the first time, i just took the battery to get checked and it has a full charge and is still good. Does this sound like anything youve ever come across before?

  • LCube81 Nov 20, 2010

    I can video what its doing no problem, where do you want me to send it to? It's not really the same sound as the flasher or turn signals

  • LCube81 Nov 20, 2010

    I went ahead and charged the battery just in case and I'm no longer getting the clicking noise or radio problems. I turn the key on and the security light flashes but after leaving it in that position for 10 mins and turning it off and back on the security light stays on after waiting another 10 mins. Try to start the car and it won't work and security light flashes once again. I tried doing the reset process again and after leaving it for the 10 mins it does the same thing again. I will try to get a code reader and plug into the computer and post the trouble codes. Again I really appreciate your help with this.

  • LCube81 Dec 04, 2010

    Tried another key module and still no luck, when I go through the reset process the security light will flash only on the first 10 min procedure. After I turn the key off and remove it for 10 seconds and turn the key back to the on position the security light stays on constantly but still will not start the car. Could the body control module be faulty?

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3 Answers

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The reset process takes 30 minutes total.Here is the complete reset process.
PASSKEY LOCKOUT RESET ALL GM CARS 1999 AND UP
1) Put the key in the ignition and turn to the "ON" position. Leave it that way for 10 minutes. After 10 minutes turn the key and take it out. Repeat this process (2) more times (3 times, 30 minutes total) This should reset the PASSKEY system to recognize your key
.
The security light that should be flashing when you try and start is the one on the dash by the spedometer. It is possible the passlock does still have an issue. Typically when this happens the you turn the key over and the dash security light flashes everything is still operational but the starter will not turn over.If this problem continues to persist after the reset process is performed the passlock may need replaced and then reprogrammed. Please let me know and can post the passlock replacement procedure for you.

Posted on Nov 14, 2010

  • 13 more comments 
  • Jonathan S
    Jonathan S Nov 14, 2010

    The passlock is part of the ignition key tumbler. Will need do the reprogramming process was installation is completed.

  • Jonathan S
    Jonathan S Nov 14, 2010




  • Disconnect the battery ground cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
  • Remove the steering column filler panel. Refer to Steering Column Opening Filler Replacement .
  • Remove the knee bolster bracket. Refer to Driver Knee Bolster Bracket Replacement .
  • Remove the instrument panel (I/P) cluster trim plate. Refer to Instrument Panel Cluster Trim Plate Bezel Replacement .
  • Remove the ignition switch bolts.
  • Lower the ignition switch away from the instrument carrier.
  • Insert the key into the ignition lock cylinder. Turn the key to the ON/RUN position.
  • Depress the transaxle park/lock cable retainer to release. Pull to remove the park/lock cable from the ignition switch.
    Important: The Passlock™ electrical connector cannot be removed until the lock cylinder is removed.

  • Depress and hold the detent on the bottom of the ignition switch in order to release the ignition lock cylinder. Remove the ignition lock cylinder with the key.







  • Disconnect the Passlock™ electrical connector.
  • Disconnect the electrical connectors.



  • Installation








  • Connect the electrical connectors.
  • Connect the Passlock™ electrical connector.
  • Connect the park/lock cable to the ignition switch.






  • Turn the key to the ON/RUN position. Install the ignition lock cylinder into the ignition switch. If you turned the key slightly while removing the lock cylinder, you may have to align the white colored ignition switch rotor (1) with the lock cylinder (2). You can rotate the ignition switch rotor (1) with your finger.
  • Remove the key.






  • Position the ignition switch to the instrument carrier.
    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  • Install the ignition switch bolts.
    Tighten
    Tighten the bolts to 10 N·m (89 lb in).

  • Install the trim plate bezel to the I/P cluster. Refer to Instrument Panel Cluster Trim Plate Bezel Replacement .
  • Install the knee bolster bracket. Refer to Driver Knee Bolster Bracket Replacement .
  • Install the steering column filler panel. Refer to Steering Column Opening Filler Replacement .
  • Connect the battery ground cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
  • Jonathan S
    Jonathan S Nov 14, 2010

    When you change out the ignition you will need to code the tumbler to your key. Make sure to not allow the tumblers inside to fall out you will need to know what number the tumblers are and what position they are in.As you start removing individual tumblers write the number down starting from front of ignition.Once you know all the numbers in order this is your key code and new number tumblers need to be installed in the exact sequence the old one were in.

  • Jonathan S
    Jonathan S Nov 15, 2010

    If you want the key to still match your key door locks you will need to use the old key and tumblers. If your okay with a second key you can just install the new lockcylinder and tumbler.

  • Jonathan S
    Jonathan S Nov 15, 2010

    The lock cylinder should not come with another key so you will need to make sure you know the key code.If you want a new key you will need to install the tumblers how you want them write down the number in order of tumbler insatllation and have a new cut at your local dealership so probably better off using your old key.

  • Jonathan S
    Jonathan S Nov 15, 2010

    Make sure to use the new tumblers that come with the lock cylinder. It is extremely vital to pay attention to the key coding.

  • Jonathan S
    Jonathan S Nov 15, 2010

    Correct the security light flashing will be the one on the dash. On the first attempt try and start the vehicle and then turn it back to run position.Let it sit 10 min after 10 min turn off remove key and turn it back on to run position for 10 min repeat process one more time.After third time is completed turn off then try and restart should restart at this point.

  • Jonathan S
    Jonathan S Nov 15, 2010

    Here is the exact reset process posted by GM





  • 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).
  • Jonathan S
    Jonathan S Nov 15, 2010

    This is the exact process from GM


    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).

  • Jonathan S
    Jonathan S Nov 17, 2010

    Try removing the key each time you shut it off then back to the on position.Biggest thing is making sure that 10 min goes by each time.

  • Jonathan S
    Jonathan S Nov 20, 2010

    the security light is no longer flashing?Almost sounds like it did learn the passcode but something additional is happening.Have to work today.I will check out the data base we use for repairs .See if this has popped up before.Hard to tell if I have run across this without actually seeing what is going on.This kind of irregular but do you have a cell phone that has a video camera that you could make a small video with?

  • Jonathan S
    Jonathan S Nov 20, 2010

    Is the clicking noise similiar to when the flashers are turned on or turn signals?

  • Jonathan S
    Jonathan S Nov 21, 2010

    Unfortunately sometimes the after market ignition tumblers aren't any good.Hope this isn't the case but possible.You can post the video to my email.Just make sure to label it so I don't think it's a viral attachment.jsmes1027@aol.com

  • Jonathan S
    Jonathan S Nov 25, 2010

    Any luck with this as of yet?

  • Jonathan S
    Jonathan S Dec 07, 2010

    Just doing a follow up. How did everything go or are still having issues? Yes it it is possible that the bcm is having problems. This is pretty uncommon to have the bcm causing the issue but definitely possible.

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    Hello Lcube.
    All the security issues I have seen with these models have been in the ignition switch.
    I have never had to replace the module.
    Contacts within the switch wear and intermittently lose their continuity.
    You will need to have the switch replaced. The lock cylinder will remain so you will not need new keys.
    There you are, thank you for using FixYa.

    KL

    Posted on Nov 14, 2010

    • FUBAR Nov 14, 2010

      OK, that is fine, just explaining to you what I believe the problem is.
      Good luck with your repair.

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    • 4,070 Answers

    Hi! It's definitely a passlock system failure. If it's faulty there will be no fuel delivery to the engine. One good reason why the car won't start. Please have it replaced and you'll be good. Hope this helps and thank you for using FixYa!

    Posted on Nov 13, 2010

    • 1 more comment 
    • dj_relly999
      dj_relly999 Nov 14, 2010

      Hi! Hows it going?

    • dj_relly999
      dj_relly999 Nov 16, 2010

      Hi! Hows it going? Thanks!

    • dj_relly999
      dj_relly999 Nov 19, 2010

      Hi! Please try removing the positive battery connector first and let it sit for atleast 5mins. then reconnect it again. System may need to be resetted before performing the procedure.

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    1 Answer

    I have tried all the tricks and i still cant get my 2000 impala to start because of the security system.HELP


    How do you know it's the security system ? Light lit on the insturment cluster ? If it is there are DTC'S - diagnostic trouble codes stored in the BCM - body control module . There are no tricks , have codes checked do the diagnostics for that code , fix the problem an it will start .
    The vehicle theft deterrent (VTD) functions are provided by the Passlock system. Passlock consists of the following components:
    • A standard ignition key
    • An ignition lock cylinder assembly, including a Passlock sensor
    • The body control module (BCM)
    • The powertrain control module (PCM).
    The Passlock sensor contains a magnet on the lock cylinder and a hall effect switch on the surrounding assembly. When you rotate this cylinder using an ignition key with the proper mechanical cut, the magnet on the lock cylinder activates the hall effect switch. When activated, the Passlock sensor provides a unique resistance value to the Passlock data circuit of the BCM. The resulting voltage is measured by the BCM. This voltage value is compared to one stored in memory (a learned value). If the Passlock data voltage value matches the learned value, the BCM sends a password, via the class 2 serial data link, to the PCM. The PCM compares this value to one stored in memory (a learned password). If the passwords match, the PCM enables engine starting.

    DTC B2947 Security System Sensor Power CKT Low
    DTC B2948 Security System Sensor Power CKT High
    DTC B2957 Security System Sensor Data Circuit Low
    DTC B2958 Security System Sensor Data Circuit High
    DTC B2960 Sec Sys Sensor Data Incorrect but Valid
    DTC B3031 Security System Controller in Learn Mode
    DTC B3033 Security System Indicates Tamper

    Do yourself a favor , take it to a qualified repair shop .

    Jun 26, 2017 | Cars & Trucks

    3 Answers

    How can I bypass the security code


    Why do think the key security is bad? If you still have a factory key, this is not the problem...if no factory key, you can take your VIN number or original key to GM dealer to get new key that they will program for you...Check for dirty battery connections:)

    Apr 30, 2015 | 2003 Chevrolet Impala

    1 Answer

    My 2003 Chevy impala will not trun over at swith


    Does the "security" light come on? It may be an issue with the GM Passlock anti-theft system. There is tons of information on repairing the GM Passlock problems. Just search for "2003 Passlock issues."

    Oct 27, 2014 | 2003 Chevrolet Impala

    1 Answer

    2004 Chevy impala won't start sometimes


    Is the "Security" light coming on?. If so, there is a problem with the Passlock key antitheft system. It is common for the ignition cylinder key detection contacts to go bad.

    Replacing the key cylinder fixes the problem. The new cylinder has to be "relearned". See the internet and search for "2004 Chevrolet passlock system relearn procedure".

    Sep 26, 2014 | 2004 Chevrolet Impala

    1 Answer

    Chevy impala will not start it keeps displaying a security message than low fuel than battery


    gm was "famous" for putting their passlock system in their vehicles. although it is a known issue they refuse to do a recall or anything else to remedy the situation. you can try leaving the key on like suggested. what i did with mine was continuously turned the key on and off. after a couple minutes of doing so the antitheft system reset and my car started right up

    Dec 31, 2012 | 2003 Chevrolet Impala

    1 Answer

    My 2004 impala has full powere but won't start no


    When it doesn't start, is the security light and maybe the battery light flashing?

    If yes, it's probably the PassLock security system. I just bypassed mine on my 2002 Impala. There are several websites with information and possible solutions; including spending several hundred dollars at the dealer, to a do-it-yourself bypass for a couple dollars.

    The best source of information I could find was:
    http://www.bergerweb.net/grandamsecurityfix.htm
    There is lots of good information there.

    If you want to see my writeup on bypassing the PassLock on my Impala, you may have to register at http://www.naioa.com and go to:
    http://www.naioa.com/v2/modules.php?name=Forums&file=viewtopic&t=44480

    Jun 27, 2011 | 2004 Chevrolet Impala

    1 Answer

    2006 Chevy Impala service security system flashes on he the display. Everything works bit the car will not start it just clicks.


    Passlock sensor in the ignition switch is probably bad.try starting the car,when it does not start leave the key in the run position for 10 minutes,then try to restart the car.(after the car sits for ten minutes the security light should be out.) If it now starts you need a new passlock sensor.

    Dec 06, 2010 | 2006 Chevrolet Impala

    2 Answers

    The car is a 2001 chev impala. At times the security light comes on for the ignition cut off with no ignition start up problems. Then with no warning the car will not start. Which means I have to reset it...


    i had to have my 01 impalas ignition switch/module (bcm) replaced my car did the same thing..the security is going bad..it thinks the car is being stolen

    Jun 07, 2010 | 2001 Chevrolet Impala

    2 Answers

    2003 Chevy Impala periodically won't start


    Try under the dash, attached to colum is a switch that the rod goes into from your ignition key switch, that may need to be adjusted tword your steering wheel just a touch, they go out of alignmnet from time to time

    Sep 15, 2009 | 2003 Chevrolet Impala

    2 Answers

    Security light comes on and car doesn't want to start sometimes.


    Disable the passlock system permanently. The other functions will still work just fine. The passlock system for some mystery reason sometimes senses an intrusion even if there is not one and locks down the fuel injectors. Underneath the steering column there is a metal plate held in place with a few bolts. It needs to come out. In order to do so you may have to remove some dash components but it is not as hard as it seems. Once the plate is removed running up the steering column there will be (3) wires bundled or tied together. These are the wires for the passlock system (Yellow + Black - and White neutral) It is the only group of 3 configured like this. START the car and while the car is running snip the YELLOW wire ONLY! and tape off the ends. Put everything back together and live better knowing your car will now start each and every time. The Yellow or Orange security light will stay on permanently but this will not cause any other problems.

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