Question about 1999 Chevrolet Silverado 1500

1 Answer

Was wondering how to disable passlock on my 99 chevy silverado?

Posted by on


1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 206 Answers

Go to on the left there is info on bypass security systems it tells you to go to a web site and purchase a bypass module

Posted on Mar 05, 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:

1 Answer

How to completely bypass bcm surcurity alarm so I can crank my 02 Chevy Tahoe

The BCM does not control the PASSLOCK system. You can bypass it by following the instructions at the website below. How To Permanently Disable GM PassLock System

Apr 18, 2017 | 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

How to program key to ignition for a 1998 Chevy truck w/vortex v6 engine..I tried it myself an it did crank but will not stay running

Program KEY ? There is no transponder in the key for a 1998 Chevy truck . What problem are you have ,no start ? Is the SECRUITY light lit on the dash ? you don't need to program keys with this ant-theft system .
Vehicle Theft Deterrent (VTD) Operation
The design of the passlock system is to prevent the vehicle operation if the proper ignition key is not used in order to start the vehicle. The mechanical key, in normal operation, will turn the passlock lock cylinder. The passlock sensor will relay the passlock data to theEVO/Passlock module. The EVO/Passlock module will determine the validity of the passlock data. The EVO/Passlock module will send a code password to the vehicle/powertrain control module (VCM/PCM). When the VCM/PCM receives the correct code the VCM/PCM allows the fuel injectors to operate normally. The passlock system requires the VCM and the EVO/Passlock module to communicate the various functions in order to operate. These functions transmit over the class 2 serial data line CKT 1807. For an explanation of the class 2 serial data operation refer to Data Link Communications Circuit Description in Wiring Systems.
Passlock System
The design of the passlock system is to prevent vehicle theft by disabling the engine unless the passlock lock cylinder rotates properly by engaging the correct ignition key. The system is similar in concept to the passkey system. However, the passlock eliminates the need for a key mounted resistor pellet. The components of the system are as follows:
The ignition lock cylinder

The ignition switch

The passlock sensor

The EVO/Passlock module

The security indicator

The vehicle/powertrain control module (VCM/PCM)

Nov 29, 2015 | Cars & Trucks

1 Answer

Does a 2006 chevy silverado have a coded ignition?

Yes, it is a Passlock system. Here are a couple of links. One for a relearn procedure, and another for troubleshooting failure and bypassing if needed.

Sep 19, 2014 | 2006 Chevrolet Silverado

1 Answer

Have 99 chevy silverado 1500 I have a headlight problem all the other lights work but headlights won't turn on

-Check "headLight fuse"
-Check connector at the headlight.
-Check the bulb. (It could burn out)


Apr 03, 2013 | 1999 Chevrolet Silverado 1500

1 Answer

How to disable passlock system on 2000 Chevrolet 2500 series truck,the security lights stays on continuosly

There isnt any way to disable it that I know of, if you could, anybody could steal the car. It just needs to be fixed by a qualified repair shop or the dealer.

Nov 23, 2009 | 2001 Chevrolet Silverado 2500HD

1 Answer

Problem starting my 2002 Chevy Malibu because of the Passlock anti theft system. How do I disable the passlock system so I don't have problems starting my car.

the only way to get by this is to install a remote starter had the same problem with my grand am it worked no more problem.

Jun 04, 2009 | 1998 Chevrolet Malibu

2 Answers

Gm passlock security system how to disable

Wiring diagrams can be found online, however i believe you can re-learn the key by leaving it inside the ignition tumblen and switch it to accesory. Then disconnect the b attery for about ten minutes and then try starting the car without taking the key out.

May 03, 2009 | Chevrolet Monte Carlo Cars & Trucks

1 Answer


The black should be ground, The orange should be 12 volts, there should be another wire. Yellow? signal wire.

Feb 19, 2009 | 2000 Chevrolet Blazer

Not finding what you are looking for?
1999 Chevrolet Silverado 1500 Logo

1,494 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts


Level 3 Expert

78289 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