Question about 2003 Chevrolet Impala

2 Answers

Security Light comes on

I have had my 2003, 3.4, sedan style Impala since 2006. Every once in a while the SECURITY light comes on but the car is running fine (it will come on while I'm driving). I can shut the car off and turn it back over and the light will disappear. It had only come on a hand ful of times, since I have had it, but there appears to be nothing wrong while the vehicle is running. Any ideas on why this is occuring?

Posted by on

  • jimqeck Feb 05, 2009

    i have the same problem and I was told by chevy to change the battery first, if that doesn't fix the problem it could be the passlock module inside the ignition.

  • airrazor23 Jan 25, 2010

    Its the Passlock system. It may eventually not 'start' but you'll still have power. You will have to wait ten minutes and it will start. (Happened to me an many other Impala owners, and you guessed it, its not on recall. you can buy a bypass online for about 37$. But you will have to find someone to hook it up. Its the best solution. The Passlock system will shut the fuel off because it 'thinks' its being stolen. You need a Passlock Bypass Kit.



2 Answers

  • Level 1:

    An expert who has achieved level 1.


    An expert that hasĀ over 10 points.


    An expert whose answer gotĀ voted for 2 times.

  • Contributor
  • 4 Answers

Disable the passlock permanently. It is not as hard as it seems. The dash assembly comes out easily and underneath the steering column there is a metal plate held in with some bolts that needs to come off. Once you get the bolt off there will be (3) wires running up the column (yellow, black and white) these will be tied or taped together. They are the only group of three coming up the steering column. START the car (vital to do this) and while the car is running snip the yellow wire in two. Tape the ends and put everything back together. Problem solved. I did this 10 months ago and have never had the problem again. I did 3 months of research finding out what a sorry system the Passlock is. The security orange or yellow dashlight will stay on but this does not affect anything.

Posted on Feb 16, 2009

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

I had the same problem and i had to have the whole security system replaced. it started off just the same way with just a light then maybe a year or less later my vehicle refused to start once i saw the light come on and i would have to sit with the key in the ON position for 10 minutes until the security reset itself. i suggest you take it to a chevy dealership and get it looked at. although there are plenty of people who have/had the same exact problem chevy will not cover it under warranty. cost me about 800 bucks to get fixed so i suggest you catch it early maybe there will be a quicker/cheaper fix for you.

Posted on Feb 09, 2009


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

2003 chevy impala 3.4l security ISSUES! reverse light comes on and front headlight at same wont start.or crank cause of security mode is on and wont disarm

here's procedure..

Jan 10, 2018 | Cars & Trucks

2 Answers

No crank no start

Chevy Impala 2008 won't crank and won't start, fix found ...

? 1:43
Nov 26, 2012 - Uploaded by Artome001
Chevy Impala, 2008, does not crank or start. ... 2003-2007 Chevrolet/GMC Silverado/Sierra No Start/no crank/electrical issue FIX - Duration: ...

2006 Chevy Impala / MC No Crank/start FIXED - YouTube

? 5:42
Jun 8, 2015 - Uploaded by Jair Duarte
2006 Chevy Impala / MC No Crank/start FIXED .... 2003-2007 Chevrolet/GMC Silverado/Sierra No Start/no crank/electrical issue FIX - Duration: ...

Passlock Security system... - Discussion on Topix

Jan 16, 2016 | 2003 Chevrolet Impala

1 Answer

Have 2003 chevy impala will not start. how do i by pass thy security system?

I was told u cant bypass security light - it may be a broken wire or a wire came off starter or it could be the key switch - mine would do that - leave key in the ignition (may have to leave ignition on) for any where from 11 - 30 minutes and see if it starts then - if it does I had to have the ignition replaced and there is a recall on those for that - it costed me $605 to get it fixed - waiting to here back from Chevy about getting reimbursed for it!

Jul 14, 2014 | 2003 Chevrolet Impala

1 Answer

How to reset security code on a Chevy impala 2003

If the security light has come on, that is indicating a problem in the antitheft system. Tho it may be intermittent right now, it can only get worse. Read thru this link, it will help you understand the problem, offer some tips and tricks, and show you some ways to bypass and fix it.

Mar 28, 2012 | 2003 Chevrolet Impala

1 Answer

Why did the security light come on in my 2003 chevrolet impala. the security light came on in my 2003 chevrolet impala. why did that happen

That indicates there is a pass-code error. There are a few reasons why. Easiest way to explain it, is that your key has a "chip" in it, with a resistance or "password" that your cars computer is looking for. It means that your cars computer did not see the right password. It will probably reset itself once it sees the correct password a few times. If not, you want to get it checked, because if it happens too often, the vehicle will not start.

The causes for this problem on these vehicles are generally the ignition switch or passlock sensor. There is also sometimes a water leak that occurs at the right front cowl, check the inside passenger side floor area, if it is wet. It could then be a BCM problem. Goodluck

Nov 29, 2010 | 2003 Chevrolet Impala

3 Answers

2003 Chevy Impala intermittently won't start -

remove and clean the battery terminals ,

Aug 01, 2010 | 2003 Chevrolet Impala

1 Answer

2003 Impala: security light come on...

Looks like the TDM in the security system (VATS/PassKey) is having problems, it's typical on those cars and it can get worse till the car wont start anymore. You can find a great write-up here: , it was the only thing that saved my Park Avenue.

May 17, 2010 | 2003 Chevrolet Impala

2 Answers

How do i reset the security system on my 2003 chevy impala

Are you reffering to the alarm or the pass lock system that put the theft light on.....If its the alarm the put the key in the door and unlock it. If its the pass lock system put the key in the ignition and turn it on and try to start the vehicle. After it shuts itself off leave the key on for ten min until the theft light stops flashing the turn key off and try to start it again. This may take a few times....

Jul 24, 2009 | 2003 Chevrolet Impala

1 Answer

2003 Chevy Impala. Security light comes on and car wont start

Leave the key in the on position for 20 to 30 minutes without trying to start the vehicle. In most cases a lose of power to the computer has happened and the security must be reset.

Jul 19, 2009 | 2003 Chevrolet Impala

Not finding what you are looking for?
2003 Chevrolet Impala Logo

1,327 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts


Level 3 Expert

78919 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6927 Answers

Are you a Chevrolet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides