# Security/no start problem on 02 chevy impala

**URL:** <https://community.cartalk.com/t/security-no-start-problem-on-02-chevy-impala/4267>\
**Category:** Maintenance/Repairs\
**Created:** [September 7, 2007, 3:49am UTC](https://community.cartalk.com/t/security-no-start-problem-on-02-chevy-impala/4267 "2007-09-07T03:49:27Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Eray2000](https://avatars.discourse-cdn.com/v4/letter/e/43a26b/32.png) [@Eray2000](https://community.cartalk.com/u/Eray2000)\
**Post date:** [September 7, 2007, 3:49am UTC](https://community.cartalk.com/t/security-no-start-problem-on-02-chevy-impala/4267/1 "2007-09-07T03:49:27Z")

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Dear CarTalk listeners,  
  
  
  
 I am a happy audience of Car Talk. Since last year, my 2002 impala started to experience the security/no start problem. Most times the car starts fine but sometimes the engine just doesn’t crank and the security light is flashing on the control panel. The no-start problem is so intermittent and every time (three times) the car was at dealership, they just cannot duplicate it.  
  
  
  
 I searched the internet and it appears this is a common problem on GM cars with Passlock system. It seems to me more like a design fault than a part problem. It is so weird that no people asked the question on Car Talk. Are they not listening to Car Talk?  
  
  
  
 I decided to take a look by myself and GM Technichal Service Bulleton points to the possible problem on BCM connectors. I can locate the BCM under the dash of driver side but somehow I cannot disconnect the BCM connector. Is there any special tool that is required to disconnect the connectors?  
  
  
  
 Any suggestions how to fix the problem by DIY?  
  
  
  
 Many thanks.

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**Author:** ![Cougar](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cougar/32/21348_2.png) [@Cougar](https://community.cartalk.com/u/Cougar)\
**Post date:** [September 7, 2007, 6:05am UTC](https://community.cartalk.com/t/security-no-start-problem-on-02-chevy-impala/4267/2 "2007-09-07T06:05:20Z")

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There may be a retainer tab on the connector that has to be pressed down in order to remove the connector.

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**Author:** ![Eray2000](https://avatars.discourse-cdn.com/v4/letter/e/43a26b/32.png) [@Eray2000](https://community.cartalk.com/u/Eray2000)\
**Post date:** [September 7, 2007, 5:56pm UTC](https://community.cartalk.com/t/security-no-start-problem-on-02-chevy-impala/4267/3 "2007-09-07T17:56:25Z")

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I do see some container tab around the connector and the press-down just doesn’t work. Maybe I should try it again.

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**Author:** ![Eray2000](https://avatars.discourse-cdn.com/v4/letter/e/43a26b/32.png) [@Eray2000](https://community.cartalk.com/u/Eray2000)\
**Post date:** [September 10, 2007, 12:49am UTC](https://community.cartalk.com/t/security-no-start-problem-on-02-chevy-impala/4267/4 "2007-09-10T00:49:22Z")

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Finally I managed to take the BCM off. I noticed a lot of yellow dots on solder points on the BCM board (both in front and back). Please take a look at

[http://mysite.verizon.net/hhlloregon/bcm01.jpg](http://mysite.verizon.net/hhlloregon/bcm01.jpg)  
[http://mysite.verizon.net/hhlloregon/bcm02.jpg](http://mysite.verizon.net/hhlloregon/bcm02.jpg)

Is it possible that the BCM is defective? Your inputs are greatly appreciated.