Question about 2001 Pontiac Grand Am SE

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Can you tell the difference between a pcm problem or passlock anti-theft with diagnostic computer

I have a grand am GT 2001 it was turning over but not starting. Towed it to my mechanic thinking it had something to do with fuel pump. He did not check anything with the fuel pump itself just hooked it up to the computer. He said every thing was ok with the fuel pump because it had the right amount of pressure and the spark plugs were working fine. He said the problem was the pcm so he got a new computer put it in and programed it. Now im wondering if it could just have been the passlock system not letting the fuel into the injectors and he put it in for nothing. By hooking it up to the diagnostic computer would he have been able to tell if it was the passlock anti-theft system? Or is there a chance he put it in for nothing? Because it is now doing it again but this time i was smart enough to try the passlock code and got it started.

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Your mechanic was wrong. My uncle runs a shop in my town and i had to take my 2001 grand am gt to him over the same problem after i towed the damn thing home and changed the fuel pump. My uncle hooked it to a computer and told me i need a pcm but he was able to see the security light upon his diagnosis and was able to reset the computer with the key trick. The car ran fine after that for about six months but now i am having the same problem. I found 300 people online with the same problem but GM refuses to make the recall so i am in search of a new passlock system. I Guarantee you the mechanic you went to found the problem and reset the computer either before or after he replaced the pcm which means he ripped you off and i would find another mechanic.

Posted on May 28, 2009

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Very Good you are right; time to find a new mechanic

Posted on May 20, 2009

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1 Answer

What most i do when my 2002 chevy avalanche security light keep flashing


Take it to the dealer or a ASE certified repair shop .or go on youtube an check out videos on anti-theft by pass for GM vehicles .There are a few different type's . VATS , pass key 1,2 or three . Being yours is a 2002 model year it isn't the VATS .
Passlock™ System
The theft deterrent system has been incorporated into the body control module (BCM). The theft deterrent is provided in order to prevent the vehicle operation if the correct key is not used in order to start the vehicle. The ignition key turns the lock cylinder. The cylinder rotation produces an analog voltage code in the Passlock™ sensor. This voltage code is received by the BCM. The BCM compares the voltage code to the previously learned voltage code. If the codes match, a class 2 message is sent from the BCM to the powertrain control module (PCM)/vehicle control module (VCM). The message enables the fuel injectors.
The design of the Passlock™ system is to prevent vehicle theft by disabling the engine unless the ignition lock cylinder rotates properly by engaging the correct ignition key. The system is similar in concept to the PASS-Key® system. However, the Passlock™ system 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 Body control module (BCM)
• The security telltale
• The vehicle/powertrain control module (VCM/PCM)

Feb 18, 2016 | Cars & Trucks

1 Answer

Why does the anti-theft light stay on?


There is a problem with the system an there is a DTC - diagnostic trouble code stored in the body control module !
The vehicle theft deterrent system is designed in order to prevent vehicle theft by disabling the fuel injectors unless the lock cylinder is engaged by the correct mechanical key. The theft deterrent system uses the following 4 components for theft prevention:
?€¢
The lock cylinder


?€¢
The ignition switch


?€¢
The body control module (BCM)


?€¢
The powertrain control module (PCM)

When starting the engine, the PCM searches for a password from the BCM through the Class 2 serial data circuit. If the password is not recognized or not present, the PCM will disable the fuel injectors. Two modes of tamper detection are provided:
?€¢
No password received


The engine will start and stall quickly. SECURITY telltale will flash on the instrument panel cluster (IPC) and then stay ON steady.


?€¢
Incorrect or disable password received (More than 3 invalid passwords are received)


The engine is disabled for at least 10 minutes and the SECURITY telltale will illuminate solid on the IPC during the 10 minutes.

After the vehicle has passed theft detection, the PCM will continue normal operation
Ignition Switch
The mechanical key and lock cylinder is located on the steering column. The main electrical switching portion of the assembly is separate from the key and lock cylinder. The VTD portion of the ignition switch is the Passlock?"¢ cylinder.
The Passlock?"¢ lock cylinder is a locking cylinder that turns a magnet past a stationary hall effect sensor. When turned to crank, the hall effect sensor is latched which applies a fixed resistance to the Passlock?"¢ signal data circuit. The voltage measured by the BCM on the Passlock?"¢ signal data circuit is the Passlock?"¢ data value.
Body Control Module (BCM)
The BCM compares the Passlock?"¢ data value to a value that it has stored in memory. If the values match the BCM sends a password via the class 2 serial data line to the PCM.
Powertrain Control Module (PCM)
When the PCM receives the correct password, the PCM enables the fuel injection system, allowing the vehicle to operate correctly. The PCM may allow the car to start and quickly stall during a failed theft condition.
If the BCM does not receive a Passlock?"¢ data value, the BCM will enter a short tamper mode. During this mode, the VTD system will not allow the car to operate for 4 seconds.
If the Passlock?"¢ data value is incorrect, the VTD system will enter the long tamper mode. In the long tamper mode, the following actions will occur:
?€¢
The THEFT SYSTEM indicator will flash.


?€¢
The fuel injectors will be shut off for approximately 10 minutes.

Although the vehicle may start, the engine will quickly stall due to a fuel cut-off.
In the event of an open in the serial data communication between the BCM and the PCM or a failure in the Passlock?"¢ lock cylinder, the following actions occur:
?€¢
The VTD system will become fail-enabled if the car has already passed theft for that ignition cycle (i.e. the engine is running).


?€¢
The PCM or the BCM may set diagnostic trouble codes (DTCs).


?€¢
The THEFT SYSTEM indicator will light continuously.


?€¢
The PCM will become fail-enabled for future ignition cycles.

If a failure occurs when the ignition is off, while the VTD system is not fail-enabled, the PCM will never receive a valid password, and will not allow vehicle operation by disabling the fuel injectors. An this system can set 6 DTC'S
DTC B2947 Security System Sensor Power CKT Low DTC B2948 Security System Sensor Power CKT High DTC B2957 Security System Sensor Data Circuit Low DTC B2958 Security System Sensor Data Circuit High DTC B2960 Sec Sys Sensor Data Incorrect but Valid DTC B3031 Security System Controller in Learn Mode DTC B3033 Security System Indicates Tamper

May 21, 2015 | 2000 Chevrolet Cavalier

1 Answer

Where is the anti theft system fuse located on 2001 Chevy cavalier


There is no fuse for the anti-theft system ! It receives it's voltage from the BCM . Do you know what a BCM is ? It is a Body control module .
The Passlock?"¢ System is provided in order to prevent vehicle theft if the ignition lock cylinder is forced to rotate or the ignition switch is operated while separated from the ignition lock cylinder case. If starting is attempted without authorization from the Passlock?"¢ System, the powertrain control module (PCM) will disable engine starting. Start disable may be in the form of fuel disable or starter disable, depending on engine application.
The components of the Passlock?"¢ System are as follows:
?€¢
The ignition lock cylinder and key


?€¢
The ignition lock cylinder case, including the Passlock?"¢ sensor


?€¢
The ignition switch


?€¢
The body control module (BCM)


?€¢
The security indicator on the instrument cluster


?€¢
The powertrain control module (PCM)


The body control module (BCM) contains the logic of the Theft Deterrent System. The BCM provides the battery positive voltage to operate the Passlock?"¢ sensor. The BCM also measures the voltage of the security sensor signal circuit. The voltage measured will indicate whether the Passlock?"¢ sensor has been activated and whether the resistance value from the sensor is a valid value or the tamper value. If voltage measured is in the valid range, the BCM compares this voltage, voltage code, to a previously learned voltage code. If the voltage codes match, the BCM sends a class 2 message containing a password to the powertrain control module (PCM). If the voltage codes do not match, or the voltage is in the tamper range, or there is a circuit fault, the BCM will not send the correct password to the PCM, and the vehicle will not start.
The body control system consists of a BCM and it's associated controls. Battery positive voltage is provided to the BCM from CLSTR fuse in the Fuse Block-left I/P. The module ground is wired to ground G201. The BCM is wired to the Class 2 serial data communication bus as well as discreet input and output terminals to control the functions of the vehicles body !
Now then Karen what problem is your vehicle having , no start an SECURITY light flashing or on solid ?
Now then

Apr 10, 2015 | 2001 Chevrolet Cavalier

1 Answer

My 05 Chevy 2500HD 6.0L won't start. I replaced the fuel pump before i realized the security light was on. I understand this to be an anti theft system. How can i dactivate it so my truck will start? I...


Do you have a second key ?
Passlock™ System
The theft deterrent system has been incorporated into the body control module (BCM). The theft deterrent is provided in order to prevent vehicle operation if the correct key is not used in order to start the vehicle. The ignition key turns the lock cylinder. The cylinder rotation produces an analog voltage code in the Passlock™ sensor. This voltage code is received by the BCM. The BCM compares the voltage code to the previously learned voltage code. If the codes match, a class 2 message is sent from the BCM to the powertrain control module (PCM)/vehicle control module (VCM). The message enables the fuel injectors.
The design of the Passlock™ system is to prevent vehicle theft by disabling the engine unless the ignition lock cylinder rotates properly by engaging the correct ignition key. The system is similar in concept to the PASS-Key® system. However, the Passlock™ system 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 BCM
• The security telltale
• The VCM/PCM

Your best bet , take it to a qualified repair shop . Security light on - DTC'S - diagnostic trouble codes are stored . Having codes check would point in a diagnostic procedure to fix the issue .

DTC B2947
DTC B2948
DTC B2957
DTC B2958
DTC B2960
DTC B3031
DTC B3033
DTC P1626
DTC P1631
Circuit Description
The Passlock™ system is provided in order to prevent vehicle theft if the ignition lock cylinder is forced to rotate or the ignition switch is operated while separated from the ignition lock cylinder case. The body control module (BCM) provides security system sensor power and low reference for the Passlock™ sensor. The BCM also measures the security system sensor voltage.
When the correct key is used to start the vehicle, a magnet on the lock cylinder passes close to the Passlock™ sensor within the ignition lock cylinder case. The magnet activates the security hall effect sensor in the Passlock™ sensor which completes a circuit from the security sensor signal circuit through a resistor to the security sensor low reference circuit. The resistance value will vary from vehicle to vehicle. The BCM will measure the voltage on the security sensor signal circuit and compare this voltage to a previously learned voltage. If the voltage measured is within the valid range, the BCM will send a class 2 message to the powertrain control module (PCM) to enable vehicle starting. If the voltage measured is not within the valid range, a class 2 message will be sent to the PCM to disable starting of the vehicle.

Jan 31, 2018 | 1997 Chevrolet C2500

2 Answers

2002 grand am security system switch problems


This site shows a solution for $250, from a reliable manufacturer called newrockies. Your grand am is covered in their list of cars that their module works on.
website is called: vatspasslockpasskeysecurityhelp.com

Jan 03, 2018 | 2002 Pontiac Grand Am

1 Answer

Replaced ignition switch vehicle will not start appears to be computer code


Is there a computer related code which I must enter via the radio ??? You don't enter anything through the radio !!!!! Having factory service repair info so you can read how the anti-theft system works an a scan tool to pull DTC'S - diagnostic trouble codes is the proper way to diagnose .
The theft deterrent system has been incorporated into the body control module (BCM). The theft deterrent is provided in order to prevent the vehicle operation if the correct key is not used in order to start the vehicle. The ignition key turns the lock cylinder. The cylinder rotation produces an analog voltage code in the Passlock™ sensor. This voltage code is received by the BCM. The BCM compares the voltage code to the previously learned voltage code. If the codes match, a class 2 message is sent from the BCM to the powertrain control module (PCM)/vehicle control module (VCM). The message enables the fuel injectors.
The design of the Passlock™ system is to prevent vehicle theft by disabling the engine unless the ignition lock cylinder rotates properly by engaging the correct ignition key. The system is similar in concept to the PASS-Key® system. However, the Passlock™ system 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 Body control module (BCM)
• The security telltale
• The vehicle/powertrain control module (VCM/PCM)

Your best bet , take it to a qualified repair shop.

Mar 06, 2018 | 2002 Chevrolet Avalanche

1 Answer

2002 Dodge Caravan,3.3L,Engine won't turn over at the key.Battery,starter and relay are good.Relay doesn't function when plugged in.It has 2 feeds.If you run a ground to the ground side of the...


It has 2 feeds.If you run a ground to the ground side of the relay,engine turns over but doesn,t run ????? The PCM - engine computer isn't supplying the ground for some reason . Anti-theft system problem . Disables fuel an starting systems . Have you checked for codes ?DTC'S - diagnostic trouble codes .

Mar 04, 2018 | 2001 Dodge Grand Caravan

2 Answers

I have a 97 Grand Am Which the theft system is keeping the car from starting. I have had the computer reset several times and it worked a couple of times but it no longer will let me start the car. Please...


Very Very Common GM Problem.
It is called a PassLock 2 system.

You can reset the computer yourself very easily.

Turn key to ON position (do NOT start). Leave in ON position for EXACTLY 10 MINUTES. As SOON as the anti-theft light quits flashing, and turns off, then IMMEDIATELY start the car.

That''s it!

You can do this everytime and it will work.

They do sell a passlock 2 bypass kit very affordable online that you can install but you won't have anti-theft but you won't have the problem either.

Mar 06, 2010 | 1997 Pontiac Grand Am

1 Answer

My key woulded trun now my auto theft system is on an my car will not start


For a 1997 Pontiac Grand AM you have a passlock-1 theft sys. Your ignition cyl has to be replaced or the passlock sensor must be bypassed. You can use a 2300-4000 Ohm resistor and connect it to the Yellow and Black wires coming from the Car's wiring harness to the black connector at the ignition cylinder. You can also try the computer re-learn process which is to leave the key in the ON (not started) position for about 10 mins. If Passlock-1 device is OK, the light should go off. If not, cut the engine side wires from the black Passlock-1 connector and solder in the 2300 Ohm resistor (Radio Shack for about $1) to the yellow and black wires. That signal is sent to the ECM/PCM telling it it's ok not to kill your fuel pump, i.e. car is not being stolen. -Tim

Aug 10, 2009 | 1997 Pontiac Grand Am

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