Question about 1999 Chevrolet Tahoe

2 Answers

1999 2dr chevy tahoe security light flashes truck won't start

Posted by on

  • Anonymous Mar 14, 2014

    have a CD player in my 95 Chevy Tahoe spend the CD's won't read keeps coming up thereerror

×

Ad

2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Chevrolet Master
  • 2,226 Answers

The security light is a visual indication that something in the car's antitheft system is failing. In most GM cars and trucks there is a hidden system that most people are unaware even exists. From the moment you put your key in the ignition, there begins a constant line of communication between your key's security chip or transponder, to the ignition's lock cylinder, and then to the car's TDM. (Theft Deterrent Module) The TDM is what tells your computer that the correct key is being used and that it is "OK" to allow the vehicle to start and run. These 3 parts must be in CONSTANT communication. If the key is in the ignition, then these parts are sending important signals to each other. The security light illuminates when that signal gets broken, even just for a second. When the signal breaks, (normally due to a failing/broken part) the car goes into antitheft mode. The car misinterperates this and thinks its being stolen or hotwired because it is NOT getting that signal from YOUR specific key. There is where the security light turns on and shuts down your vehicle. So basically, if that light is on, your system has some sort of failing part. This can start as an intermittent "no start", to your vehicle not running for days at a time, to the vehicle NEVER starting again. The problem is electrical and computer based, so don't count on an easy reset button, or the problem fixing itself. The hard part is isolating which part is the problem. You can spend a thousand dollars through a mechanic very easily. I have had great luck with bypassing the entire system. This way the problem will never return. It actually CAN'T ever return because it is eliminated. This can also be done yourself at a much cheaper cost. Read through this link very carefully. You'll find alot of information and pictures, along with ways to help you fix this.



http://vatspasslockpasskeysecurityhelp.yolasite.com/

Posted on Jun 26, 2012

Ad
  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

Take the connector loose that is plugged into your ignition, has 3 small wires, ( orange w/black stripe, red w/white stripe, yellow) WHILE TRUCK IS RUNNING.
After disconnected security light will remain on ut truck will start

Posted on Jul 18, 2012

Ad

6 Suggested Answers

6ya6ya

6ya staff

  • 2 Answers

SOURCE:

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this 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.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

Molson02536

Harvey N Tawatao

  • 3854 Answers

SOURCE: have 2003 chevy tahoe the security light flahs

Your Passlock may need to relearn the ignition keys, if the ignition lock has gone bad like my in-laws Grand Am Gt, here is what i did so they will not get stranded any more. Buy a Passlock by pass module for around $70.00. You can orderone from GMPASSLOCK.COM in the mean time try resetting the Passlock. Good luck

Ignition keys relearn takes about 30 min to do. 30-Minute Learn Procedure 1. Turn ON the ignition, with the engine OFF. 2. Attempt to start the engine, then release the key to ON; the vehicle will not start. 3. Observe the SECURITY tell tale light. After approximately 10 minutes, the light will turn OFF. 4. Turn OFF the ignition switch, and wait 5 seconds. 5. Repeat steps 1 through 4 - two more times - for a total of 3 cycles of 10 minutes. 3x10 = 30 minutes. The vehicle is now ready to relearn the Passlock Sensor Data Code and/or passwords on the next ignition switch turn from OFF to CRANK Important: Turn the Ignition Switch OFF. 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. 6. Start the engine. The vehicle has now learned the Passlock Sensor Data Code and/or password. 7. With a scan tool, clear any DTCs if needed. History DTCs will self clear after 100 ignition cycles. Without a scan tool you may have momentary starter interruptions while history clears itself.

Posted on Dec 18, 2009

Anonymous

  • 1 Answer

SOURCE: I have 2000 Chevy Tahoe Z71. The security light stays on

1999 chevy tahoe security light goes on while im driving does
not seem to cause any problem

Posted on Aug 25, 2009

Anonymous

  • 87 Answers

SOURCE: Security light comes on Chevy Colorado still starts but

honestly, any number of thing's could cause the security light to come on, i would go to my local auto store and ask them to run a coad scsnner to find the problem, good luck

Posted on Dec 21, 2009

jsmes1027

Jonathan S

  • 749 Answers

SOURCE: my chevy tahoe will not start and the security

If the light is flashing it may be an issue with the passlock sensor.Here is a process you can try to reset the passlock. If this process does not work you may need to replace the ignition tumbler and passlock.
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
.

Posted on Mar 08, 2011

Anonymous

  • 1 Answer

SOURCE: PUT IN NEW STEREO NOW CAR WON'T START & SECURITY LIGHT IS ON

i am in training for a mechanic and all you have to do is put a battery charger on it and leave the ignition on it needs to re learn the system

Posted on Jan 17, 2010

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

My 1995 Chevy Tahoe won't shift gears as I'm


Probably the speed sensor on the transmission. It would cause both problems. You should also have a check engine light with a trouble code for the sensor.

Jul 17, 2013 | Cars & Trucks

1 Answer

Service traction light came on & my chevy cobalt 2008 won't start.


traction control will not cause starting issues read check engine light or security

Mar 15, 2013 | Cars & Trucks

1 Answer

Chevy Tahoe fuel system


Two things:

First, are you aware that your vehicle will only have power to the fuel pump for about 2 or 3 SECONDS before engine start-up? Then the engine must be running for it to have any power beyond that?

Second, is the "Security" light flashing on your dash? If so, you have a security system problem. There won't be any power to the fuel pump.

Jun 02, 2012 | 1999 Chevrolet Tahoe

1 Answer

The 'theft system' light does not turn off with the key in the run position on my 1999 chevy cavalier. car won't start, it won't even crank over. the battery and the starter are brand


try locking your car with the key and unlocking it with the key, leave it for 30 second or so between the locking and unlocking , the car thinks some one has tampered with it

Mar 18, 2012 | 1998 Chevrolet Cavalier

1 Answer

My 2001 chevy venture won't start


Check out this link, should help you understand why that security light is causing this problem.

http://vatspasslockpasskeysecurityhelp.yolasite.com/

Mar 06, 2012 | 2001 Chevrolet Venture

1 Answer

My 2003 chevy tahoe won't start in the morning


Many possible causes....Too little info to make an intelligent suggestion. Try charging the problem vehicle's battery with jumper cables for 2 minutes with the supply vehicle running at fast idle (or about 1500-2000 RPM, if it is tachometer equipped) before you try to crank the problem vehicle on a cold morning. If it starts right up, you likely have a weak battery that needs replacing.

Feb 13, 2012 | 2003 Chevrolet Tahoe

1 Answer

1999 CHEVY LUNINA WON'T START BATTERY AND


Check the dash once you turn the key to the run position the passlock runs a security check using a set resistance value through the chip in the key. If the security light begins to flash the reading it received was incorrect or it didn't get a reading at all. You can try reseting the value it is looking for by turning the key to start then releasing it. After 10 minutes turn it off then cycle it start again leaving it in on for 10 minutes then back to off then one more time. After the third cycle has completed for a total of 30 minutes. You should be able to turn the key on and start the vehicle. If the light continues to flash their is a problem with the chip in the key or the connections within the ignition its self. Both are common but a Pass Lock Relearn as described above will usually adapt to the poor connection values. Hope this helps.

Aug 28, 2011 | 1999 Chevrolet Lumina

1 Answer

Hello. My 1997 Chevy Tahoe refuses to start. The problems began with a bad fuel pump. I changed. It worked. The fuel pump died again. I changed it again and it has been working. I parked it for two weeks....


Now you have a good battery & a starter that turns over the motor

Have you cycled the key on & off with a fuel pressure gauge on the
fuel rail?

Do you have a fuel filter that isn't over 3 or 4 years old?

Have you checked for spark while cranking ? Use an old plug on the wires,
if you have ignition wires,don't ground the wire without resistance

If you removed the ducting & MAF Sensor it won't start

Tell us what you checked & exactly how that was done.

Jun 09, 2011 | 1997 Chevrolet Tahoe

Not finding what you are looking for?
1999 Chevrolet Tahoe Logo

3,602 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts

Marvin
Marvin

Level 3 Expert

85206 Answers

Jonah Oneal

Level 3 Expert

14092 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22484 Answers

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

Answer questions

Manuals & User Guides

Loading...