Question about 2000 Pontiac Grand Am GT

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The passlock security is acting up and not letting me start the car.

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Posted on Oct 04, 2010


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Wont start passlock not on got jump it starts then wont start got another jump wont start tried passlock relearn lites gagues work got jump it starts it wont start again wit jump took battery in itsok

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iFixitThose of you that have stalling problems, it is not passlock. ... traction fault on the display when it shuts down or won't start and have to wait my 10 min to restart.

GM Passlock Security Light Issues - RepairPal
If you find yourself stranded, your engine won't start, and the security light is flashing, ... The most common repair is to replace the ignition lock cylinder or Passlock ... The warning light on the VATS system is similar except it does not have the ...

No Start Due to Failed Passlock Sensor : Pontiac Grand Am ... > Problems > Pontiac > Grand Am

Dec 05, 2015 | Cars & Trucks

1 Answer

How do i bypass the pass key/ security system- my 98 buick lesabre died on me and i'm sure that's the prob.

Is the security light on and flashing? If not the problem is not the passlock, but if you wish to bypass it here is how you do it. How To Permanently Disable GM PassLock System

Apr 19, 2017 | 1998 Buick LeSabre

1 Answer

Replaced ignition car wont start

Here is a link that can help you with the bypassing of your Passlock antitheft system.

Mar 25, 2012 | 2000 Oldsmobile Alero

1 Answer

Passlock security

The 2000 saturn runs the passlock system. Unlike VATS its predecesser, this system is much harder to bypass. The old "resister" trick that many people still do, does not apply for this system. So lets start at the basics. The security light flashing indicates 1 of 3 things. The problem in your passlock is either in the KEY, IGNITION LOCK CYLINDER, or WIRING before the Theft Deterrent Module (computer). This means you could replace the key or the ignition (whichever is to blame) and you might be ok. You would have to reprogram the key to the ignition. The other option is to bypass it. Unfortunately that costs money also, but honestly no more than a new transponder key and far less than a Lock Cylinder. Just trying to give you all the options. Here is a link that explains the SECURITY problem rather well and gives some good tricks and options for fixing this yourself permanently

Dec 10, 2011 | 2000 Saturn Ls 4dr Sedan

1 Answer

Let me be a little more specific about the steering column security system, I was stranded for half a day two years ago. The car would start for half a second and die. When I finally got it to the d

1999 GMC Safari is equipped with a PassLock* system. It is designed to disable engine starting unless the ignition lock cylinder rotates correctly when the proper key is installed. The system is similar in concept to the PassKey* system. However, it eliminates the need for a key-mounted resistor pellet.
The components of the PassLock* system are as follows:
> The ignition lock cylinder
> The ignition switch
> The PassLock* sensor
> The PassLock* module
> The security indicator
> The Vehicle Control Module (VCM)

If any of the components (with the exception of the security indicator) is replaced, the PassLock* sytem must be reprogramed before engine start will be enabled.

When the system malfunctions, it is necessary to retrieve fault codes from the VCM to correctly determine which part of the system is causing the problem.

* "PassKey" and "PassLock" are registered trademarks of Genral Motors Corporation.

Nov 21, 2011 | 1999 GMC Safari

2 Answers

My 1997 chevy cavalier has a problems that seems to get worse and worse. The anti theft system continues to act up. I try doing the "ten minute" method where I Leave the car in the on position...

The problem is not your computer. The problem is a defective PassLock cylinder. It is not reading your key correctly. The lock cylinder for your ignition reads a chip in your key and sends a digital signal to the computer to let the computer know that a valid key is being used to turn the ignition on. (This keeps some jerkwad from stealing your car by breaking the lock cylinder and starting the engine with a screwdriver.) When the security light starts flashing and the engine will not start, it is because the ignition switch was turned on and everything powered up but the passlock system did not read a valid key code. Replacing the passlock cylinder should fix your problem. This is pretty common.

Jan 08, 2011 | 1997 Chevrolet Cavalier

1 Answer

Car wont start reads pass key fault

Passlock I reset.

1. Attempt to start the car, let it stall, but DO NOT turn the key off! Leave it in RUN.
2. Wait 10 minutes or until the Theft Sys light glows steady instead of blinking.
3. Do not turn the key off, but start it immediately.
4. This should reset your Passlock system.


The following is a procedure to disable Passlock I or II Systems for vehicles
in which remote start/stop system installations are required. This procedure
is required because a remote start system will not function with the current
Theft Deterrent System (Passlock) which is included on many 1996 and up GM

Please note that this modification is intended to be used only in conjunction
with the installation of a remote start/stop system and does not provide a
procedure to install a remote start/stop system.

If an attempt is made to start a vehicle by a means other than a key rotation
in the ignition switch, the Body Control Module (BCM) will interpret this
start as a vehicle theft and disable the fuel injectors.

A minor wiring modification may be made to allow the vehicle to be started
remotely. This modification includes adding a switch to allow the customer to
select ?ON? to allow remote starting or ?OFF? for normal Passlock operation.

CAUTION: When this modification is performed and the switch is set to the ON
position, the theft deterrent feature will be disabled. When the theft
deterrent is disabled the SECURITY/THEFT SYSTEM telltale will light up
indicating that the theft deterrent system is NOT functioning.

Refer to appropriate GM service manuals and/or SVMQP Electrical Guideline
Manual for instruction on splicing and electrical connections.
1. Select a suitable on-off switch (see note below) which will be used to
enable the Passlock System. Mount the switch in a location such that it is
accessible to the driver and will not interfere with normal vehicle operation.

NOTE: This is an extremely low current circuit (approx. 7mA), it is therefore
very important that a high quality, low energy, fast acting switch be
utilized for this application.
2. Turn the ignition switch to the OFF position.
3. Locate the Main Ignition Switch Harness in the Column. GM's Passlock
System wires exit the Ignition Switch Tumbler together and then join with the
Main Ignition Switch Harness. (See or and select your Make, Model and
Year for wire colors and clues on the quickest way to access these wires.)
4. Locate the Yellow Passlock Data Wire which is included in a bundle of
three tiny (20 GA) wires wrapped in friction tape.
Cut this wire and splice a 0.5mm2 (20 GA) yellow wire to each end of the cut
Keep wire length to a minimum. Route modification wires clear of moving parts.

Connect the yellow wires to the switch such that the contacts are OPEN when
the switch is in the ON position.
5. Turn modification switch to the OFF postion (contacts closed).
6. Start vehicle to verify normal operation. If engine ?cranks but will not
recheck the switch position (contacts should be closed), wire connectors and
modification wiring.


To enable remote start:
Start the engine with the ignition key (modification switch must be in the
position). Turn modification switch to the ON position (contacts open). The
SECURITY/THEFT SYSTEM Telltale will light up indicating that the Passlock
System is inoperative.
Once the SECURITY/THEFT SYSTEM telltale has been on for at least 5 seconds
the vehicle can be turned off and then remotely started.

To disable remote start:
The Passlock System can be reactivated by turning the modification switch OFF
(contacts closed). Vehicle can either be running or off when this is done.

Please note that the VCM/PCM will record Diagnostic Trouble Codes (DTCs)
related to the security system when the modification switch is in the ON
position (circuit open). This is due to the way that the VCM/PCM interprets
this condition.

Any condition which removes battery power from the Vehicle Control
Module/Powertrain Control Module (VCM/PCM) (e.g. dead battery, disconnected
harness connectors, etc.) will prevent the vehicle from being restarted. If
the engine exhibits a ?cranks but will not start? symptom, place the
modification switch in the OFF (contacts closed) position. This will
reactivate the Passlock System and allow the vehicle to be started with the
ignition key

Dec 12, 2009 | 1995 Chevrolet Caprice Classic

1 Answer

My 2007 tahoe security light came on and now my car wont start. Do you have any idea how to unlock the security? I have tried looking in my manual and no clue

It's the passlock system that is acting up.. I have the same problem at the moment but mines came from disconnecting my stereo system, the power wire sparked and toasted one of the computers. now the important thing is if the security light is flashing or is steady on.. if it is flashing you just have ti reset the security by turning the key to the on posistiona and wait about 10 - 15minutes and let the pass lock reset.. is it is steady on (no flashin):

a steady light means that you could have a Class 2 data circuit problem. It indicates that your "passward" from your key in the "passlock" is not getting sent to the (Vehicles Thieft Deterrent) thats inside your Vehicles Control Module. This shuts down your fuel log or injectors stopping the engine from starting. The vehicle might start, but then stalls after 4 sec or so.
It's like the vehicle thinks it's been stollen. That's too bad, if your light was flashing "and" your cycles were correct the car would have re-leaned the passward and started.
A problem could mean...but not limited to a open,shorted or grounded circuit....or a loose or open connector between these comunicating systems: SIP/PCM/VTD/VCM and perhaps the EBCM.
Security Insturment Panal
PCM - Passlock Control Module
VTD - Vehicle Theift Deterrent
VCM- Vehicle Control Module
EBCM - E Brake Control Module

you may have to have the dealer check and replace / but instead of passlock system you may have the Passkey 3+ system

Jan 25, 2009 | 2007 Chevrolet Tahoe

1 Answer


BCM controls your passlock system. All that is required is leaving your key in the igntion with it on for around 10-15minutes. Then attempt to start. The passlock system is self learning. Let me know if this works, if not we can trouble shoot from there. Thank you for using

Oct 05, 2008 | 1998 GMC Savana

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