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'02 Impala 3.4l 136.5K: Pothole = SECURITY Message

 
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ColtHero
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2002 Chevrolet Impala


PostPosted: Sat Jul 17, 2010 1:36 pm    Post subject:  '02 Impala 3.4l 136.5K: Pothole = SECURITY Message Reply with quote

'02 Impala 3.4l 136.5K: Pothole = SECURITY Message

Last Sunday 7/11/10 (~136,300 miles), the passenger front wheel got swallowed up by a sizeable pothole, causing the SECURITY message to immediately illuminate (I was driving and noticed it instantly). The light stayed on all the way home (~10 miles) and when I got back home, after shutting the car off, I immediately checked to see if the car would re-start and it did. The message went away and I figured that would be the end of it.

But after no message all week, it has reappeared today. Still, no problem starting/re-starting the car, however.

The last time this message appeared on this car was in July of 2008 (107,095 miles). That time, the car would not start for 10 minutes. Before that, it occured for the very first time on 9/13/07 (97,475 - clear afternoon), and then again on 9/28/07 (97,900 - clear morning). No potholes or shock trauma either of those times (as far as I know).

My understanding of this SECURITY message problem is that it's either an ignition block or Body Control Module issue. Could a front-end jolt have aggravated either of these things (doesn't seem likely), or is there something else I might need to look into??
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IffyG
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PostPosted: Sat Jul 17, 2010 11:40 pm    Post subject:   Reply with quote

It's probably an issue with your ignition cylinder/pass lock sensor. You can get they on eBay for around 100 bucks with 2 keys and install them in less than 2 hours including the security relearn.

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ColtHero
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PostPosted: Sun Jul 18, 2010 3:26 pm    Post subject:   Reply with quote

iffyg:

Yeah ... I'd have to research that whole ignition block thing all over again before I do that. Two years ago when this first happened I thought I remember reading where some people had replaced the IB (or modified it) only to have the problem return. Then there were others that replaced the BCM. Don't know how they fared. Seems like since it's been two years since this problem has happened to me, there's a waiting period before you'll know whether a particular solution actually works!

A poster on another board said that if the SECURITY message appears AFTER the car has been started, it goes into failsafe mode and continues to start and run OK. So I guess that's where I am right now, but the circumstances under which I got there (hitting a pothole) are awfully strange ...

Think I'm going to take a 'wait and see' approach here.
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fastrunner08
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PostPosted: Mon Jul 19, 2010 12:56 am    Post subject:   Reply with quote

i had an issue like that, it started with the security light, moved on to not starting then funny thigns owuld happen. sometimes it would start other times it wouldn't. One thing ilearned though was if you pulled out the right bcm fuse and put it back in it would go away for a while. So possibly if you pulled out the fuss and let it sit for a while and put it back in? Not claiming that would work, but it would hurt to try. I did replace me ignition block, didn't do much for me, it wound up being my bcm which was shot.

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ColtHero
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PostPosted: Mon Jul 19, 2010 5:35 pm    Post subject:   Reply with quote

fastrunner08:

Maybe it's just coincidence, but I had the car up on ramps changing the oil this past weekend and when I put it back on level ground the SECURITY message had gone away. Hasn't returned yet (as far as I know).
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IffyG
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PostPosted: Mon Jul 19, 2010 5:39 pm    Post subject:   Reply with quote

There is often no rhyme nor reason to the appearance of the security light. I'd say stop looking for a pattern, you are just gonna drive yourself crazy.

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ColtHero
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PostPosted: Fri Oct 14, 2011 9:06 pm    Post subject:   Reply with quote

Just wanted to report that I still haven't seen it since. And I'm at nearly 150,000 miles now.
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