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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What will cause a 1999 Pontiac Sunfire to not go into the extended learn mode when replacing the ign lock assembly .

Did you clear codes ? . All codes in the theft deterrent module must be cleared for a relearn.
PASSLOCK Changing - Components Description
Important: Due to component variability, the vehicle theft deterrent (VTD) system must have the learn procedure performed regardless, if the vehicle starts on the first ignition cycle after a VTD repair.
All codes in the theft deterrent module must be cleared for a relearn.
Engineers design the Passlock™ system in order to prevent theft even if the various theft deterrent parts change. The Tamper mode will engage if any of the following components change:
• The Passlock™ lock cylinder
• The instrument cluster
• The powertrain control module (PCM)
If you replace any of the above components, the system will enter the long tamper mode. If the system enters the long tamper mode, ensure that the system completes a long tamper mode cycle. During the long tamper mode cycle, the THEFT indicator will flash for the full 10 minutes. The instrument cluster and the PCM require the full 10 minutes in order to complete the learn cycle. Ensure that the ignition switch remains in RUN until the indicator stops flashing. If you turn the ignition switch before the indicator stops flashing, repeat the long tamper cycle from the beginning.
Are there any codes ?
The THEFT SYSTEM indicator will not light under any circumstances.
Replace the instrument cluster.
For Chevrolet vehicles, refer to Instrument Cluster Replacement .
For Pontiac vehicles, refer to Instrument Cluster Replacement .
Multiple indicators light continuously.
Test for a loss of serial data. Refer to Data Link Connector.
Instrument cluster DTC B1021 sets.
The DTC indicates a loss of powertrain control module (PCM) serial data. Refer to Data Link Connector.
Instrument cluster DTC B1022 sets.
The DTC indicates a loss of SIR serial data. Refer to Data Link Connector.
Instrument cluster DTC B1023 sets.
The DTC indicates a loss of ABS serial data. Refer to Data Link Connector.
PCM DTC P1601 sets.
The DTC indicates a loss of PCM serial data. Refer to Data Link Connector.
PCM DTC P1629 sets.
The DTC indicates PCM Theft Deterrent failure. Refer to the appropriate diagnostic table in Engine Controls.
Instrument cluster DTC B1011 sets.
Refer to DTC B1011 Passlock Cyl Data Shorted This Ign Cycle .
Instrument cluster DTC B1012 sets.
Refer to DTC B1012 Passlock Bad R-code This Ignition Cycle .
Instrument cluster DTC B1013 sets.
Refer to DTC B1013 Passlock Bad Timing This Ignition Cycle .
Instrument cluster DTC B1014 sets.
Refer to DTC B1014 Passlock R-code Unprogrammed .
Instrument cluster DTC B1015 sets.
Refer to DTC B1015 Passlock Cluster Fail Enabled .
Instrument cluster DTC B1017 sets.
Refer to DTC B1017 Passlock R-code Learn Failed .
The indicator flashes and no instrument cluster codes are set.
Refer to DTC B1013 Passlock Bad Timing This Ignition Cycle (the diagnostic table for DTC B1013).

Apr 07, 2017 | 1999 Pontiac Sunfire

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

I have a Saturn 2001 4door s series the security light is on and won't start what can I do

The passlock system is a vehicle theft deterrent system which deters drive-away vehicle theft by disabling engine operation if the ignition lock cylinder is not rotated with the proper mechanically cut key.
The passlock system is made up of an ignition switch assembly, passlock sensor, body control module (BCM), instrument panel cluster (IPC), and a powertrain control module (PCM).
The ignition switch contains a magnet mounted on the lock cylinder and a passlock sensor assembly which consists of security hall effect sensor, tamper hall effect sensor, and output resistors. A drill proof metal shield is also staked over the sensor housing.
The passlock sensor mounted to the ignition switch assembly is located inside the upper right side of the steering column. The passlock sensor contains two hall effect sensors: a tamper hall effect sensor and a security hall effect sensor. The tamper hall effect sensor is mounted on top of the security hall effect sensor. Should someone attempt to defeat the system by use of magnetic experimentation, the tamper hall effect sensor will activate first.
The BCM has the passlock controller integrated into it which controls the majority of the security systems logic. The BCM reads the data from the passlock sensor continuously. If the data is correct and has been received by the BCM within a specified time, the BCM will send a coded password to the PCM. The PCM will then allow the fuel injectors to operate.
The coded password for the security system is sent from the body control module to the PCM via the class 2 data link. If the password is correct and received within the specified time, the PCM will allow the fuel injectors to operate.
The IPC contains the security telltale. The security telltale has three modes of operation, OFF, FLASHING, and ON.
SECURITY TELLTALE will be off if:
Ignition is in the OFF position

Ignition is in the RUN, START, or ACC position and security system diagnostics have all PASSED

SECURITY TELLTALE will be on if:
The BCM is performing a bulb check at vehicle start

Security system diagnostics have not yet completed at vehicle start

A security system diagnostic trouble code (DTC) is set in the BCM or PCM

SECURITY TELLTALE will be flashing if:
The tamper hall effect sensor has been triggered

Incorrect passlock sensor data to BCM for more than 5 seconds during vehicle start

No passlock sensor data to the BCM for more than 5 seconds during vehicle start

Incorrect password from the BCM to the PCM after 5 seconds during vehicle start

Oct 23, 2015 | Saturn 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

Need to disable antitheft on 1997 pontiac grand am 2.4

Very difficult to disable. This car uses a passlock system to enable engine starting. The ignition cylinder sends a signal to the instrument panel which then sends a coded signal to the PCM. It would be much easier to fix the anti theft than to try to disable it.

Dec 21, 2010 | 1997 Pontiac Grand Am

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

1 Answer

1996 Pontiac Grand AM

Try this first, it 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. Good luck and hope this helps, keep me posted, be glad to help

Jun 14, 2009 | 1996 Pontiac Grand Am

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