Question about 2001 Chevrolet Impala

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2001 Chevy Impala Security System

My 2001 Impala does not start and the security light comes on even though we are using the correct key. Is there any way we can disable the security system wiring so we do not have to get a new ignition cylinder and where can I get the wiring diagrams on the internet so I do not have to purchase a repair manual?

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  • lashaundra ellison May 17, 2008

    I have the same exact problem. My car will not start for exactly ten minutes and th security light is flashing. I never know when this will happen but once it starts, the car runs like a champ. I have taken the car to the dealer and had the ignition fixed but that is not the problem. help!!

  • Anonymous Jun 26, 2008

    I have the exact same problem. Sometimes it will go for months with no problem then as your driving the yellow security light comes on and you know that once you shut the car off it will not start. I have tried using the remote lock and double clicking it twice and that seemed to work but then that stopped working. I will try clicking it three times. This is a very common problem with GM but they bury their head and ignore the problem.I will probably never buy another GM car.

  • Anonymous Jul 24, 2008

    We have the same problem with the car not starting sometimes. If we leave it exactly ten minutes it seems to start. If we try to start the car now in the ten minute period it will not start for another 10 minutes. I hope someone finds the solution. Someone told us to disarm the timer off the security system however we need a wiring diagram for this mechanic. Does anyone know where we can find a wiring diagram?

  • hurth08 Nov 02, 2008




    I have the exact same problem my 01 impala has done this for years. Security light comes on for a couple of days and one day out of the blue it wont start for about 15 min.


  • Anonymous Mar 04, 2009

    i have a 2000 olds alero, and a 1998 sierra 5.7 l, security lights up, at times won t start, how to remove system?

  • Angela Apr 29, 2012

    2001 Chevrolet Impala starts in the morning but wont start in the evening, interior lights wont come on, radio wont come on, door locks wont work, next morning vehicle starts on a dime- We think its the security system- how do we disengage the security system?
    Angie at amtlogsdon@live.com Thank You!!

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I have a 2001 Impala. My security light will flash and sometimes the car won't start. My dad told me turn the key to the start position, place your foot on the break, put your car in the last gear it was in (D, R, or N). Then shift all the way back into park. Make sure you shift all the way into park. Take your foot off the break. Then turn ignition back to off. Your car should then start right up. He said the sensor still thinks the car is in D, R, or N although it's in park. So it confuses the system and it doesn't start because it doesn't know which function to do. It pretty much locks up. I'm pos. this will work. My car does it every few months. Hope this helps.

Posted on Oct 05, 2009

  • rebel69now Dec 02, 2010

    I was told if you turn the key off and on 3 times leaving it on the 3rd time letting it sit for ten minutes
    will reset the computer and car will crank.I had to turn ignition back on press brake pull shifter down to low and back to park 2 times quickly and car started right up.My mechanic says ignition needs replaced cost 340.00 said it was a common problem,said he replaces them often.
    R.V.L. / WALKERTOWN,N.C.

  • TJ Jones
    TJ Jones Apr 20, 2014

    I just did this and it worked. Now time to get rid of a Chevy!

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I had the exact same problem for 4 long years but I did find the solution so it will NEVER happen again. Put shifter in neutral, get out, push vehicle 10 feet forward, That's it! Oh...make sure you are at the edge of a 100 foot, or more, cliff. I swear to you, you will never have this problem again with this vehicle. GM should have recalled this years ago but does that surprise anyone?

Posted on Oct 31, 2009

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Try clicking the LOCK button on the key fob THREE times, letting the car sit for a minute or two then UNLOCK and try to start.

Posted on May 28, 2008

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Mine did the same thing and what i had to do was go in through the settings area of the radio and choose the "RESET FOB" selection tried it and it worked perfectly...hope this helps

Posted on Jul 16, 2008

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I am a prior Law Enforcement Officer and I had a 2003 impala for a police cruiser and I had the exact same problem. I will tell you what worked for me and you are not going to believe it but it did work. The next time you notice the problem, look over and see if you left the AC switch on. If it is on turn it off and then try to restart it. I dont know what it is but when my cruiser did it all you had to do was turn off the AC and it would start EVERY TIME!!!!!!!!!!!!!!!!! Hope this helps.

Posted on Jul 25, 2008

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Www.newrockies.com
They sell a passlock bypass that is relatively easy to install....about 4 wires that will stop that problem. My 2001 Impala has been ok since I installed this bypass.

Posted on Jan 31, 2012

  • Angel Williams Jun 07, 2013

    where did you buy it?

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  • 58 Answers

Some customers may comment on an engine that will not crank. Others may comment on the security light being on. Technicians may find DTCs (diagnostic trouble codes) B2958 and/or B2960.
The following are the likely causes of these conditions:

  1. Damaged or loose/unseated terminals in these BCM
  2. connectors may cause a security light or no start condition:
• BCM connector C1 (24-way, pink in color), term
inal B9 (white wire, circuit 1459) • BCM connector C1 (24-way, pink in color), terminal B12 (black wire, circuit 1835) • BCM connector C2 (24-way, grey in color), terminal A3 (yellow wire, circuit 1836)

Posted on Nov 01, 2009

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I am a gm tech, i have been working for gm for 19 years. trust me, you need to replace your ignition cylinder, this will include the "passlock" sensor. you can replace it while the car is running. if you pull off the black cover around the igniton cylinder with a small pick, you then can push a release tab to remove the cyinder while its running. if you do it this way the vehicle will relearn the new pass code. if not you will have to have it programmed. also when you buy it the cylinder, you will need to get it at a gm dealership, you will also have to have the new cylinder coded to your key. good luck!

Posted on Dec 23, 2008

  • dedricp Nov 29, 2010

    How do you make the passlock sensor program. it want start at all! i turn my key to on it blinks tha brake light, mileage,battery logo,airbag logo and check engine light. i already replaced the ignition what do i do now ?

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I had this problem for years on my `01 Impala, the car was at the dealers more than home. The problem is with the pass lock security system, you take out the key and when you put it back the security system says the wroung key. What I did was to take the key off the key ring with clicker on chain and leave the key in ignition. This has solved my problem for 6 or 7 months now. You use your clicker to lock and unlock your doors and never remove the key. Yes some one might steal it but, as I told my wife, we have insurance and would be better off if it was stolen.

Posted on Nov 08, 2008

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How can I bypass the security code


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