Question about 1997 Chevrolet Malibu

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Theft system sensor is not allowing my car to start

This is thw 2nd time my car does not want to start because the theft system sensor is on and is not letting the ignition start. My husband repaired it the 1st time but forgot what he did can anyone help.

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  • fresnomayra Dec 28, 2008

    my car finally started after a few hours. but because my husband disconnected the battery touched the ground wires. now my gas tank reader is not working do you know how to reset the fuel line sensor

  • marypistorio Jan 13, 2009

    I have a 2004 chev. malibu classic & was told by the dealer that my theft auto sensor needs to be replaced because the car will not start. The cost to repair this is $600.00. Is there any way around this that will allow my car to operate without it? Please advise!

  • cssouther Jan 27, 2009

    My gas hand doesn't work and my fiance has tried everything to fix that. We had to have a new ignition switch put in a year ago and ever since then the gas and heat gage doesn't work. Just in the last 2 months, the theft system light has started flashing, and the car won't start. Other web sites and forums I have searched has said that when the theft light flashes and the car won't start is because the theft system turns off the fuel pump. I need to know if anyone knows how to diable the theft system. Other sites says you can do it, but I am not sure how. Can anyone help with this? If my fiance figures this out tomorrow when we go to work on it, I will post the answer to my own question, but if anyone can help b4 then, that would be great.

  • yadayada
    yadayada May 11, 2010

    did u post this problem before?


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What if i change my timing belt and then i start the car with out the bully can i start without the bully sensoring the bully o gran shaft

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Had the same problem- the AC Delco mechanic said sometimes if you accidentally put the wrong GM key into the ignition(which I had), it sends a message to the anti-theft that the ignition is being tampered with(foreign object). It has to be reset with a diagnostic tester, and the anti-theft will put itself to rest. I had been getting in the Malibu and putting my Express Van keys into it, Hey , the all llok alike!

Posted on Mar 06, 2009

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My cadillac 04 cts wont start. Thinks its the scurtiy feature. Any1 have a idea

Is the security light lit ? Car an pad lock symbol . If any of these are lit it is the anti-theft system . Does the engine crank over but won't start an run ? The anti-theft system will allow the engine to crank but not start , disables fuel injectors . If the anti-theft light is lit there are DTC'S diagnostic trouble codes stored in the theft deterrent module an or the ECM .
Does anything happen when you turn the key to the start position ?

Jun 24, 2016 | Cadillac 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

How do i reset the anti theft system on 1996 caddilac deville

There is no reset, it does this every time you lock and unlock the door or put the key in the ignition

Jul 27, 2012 | Cars & Trucks

1 Answer

E320 key won't start 1st try

It is a key issue most likely, try unlocking the car and taking a little more time to insert key into igniton than you normally do to see if that works. It can be a coding/timing issue in the anti-theft logic and most times replacing the key is all that is needed. otherwise it is the EIS acronym for electronic ignition switch which is a major control unit for the starting and anti-theft system.

May 17, 2012 | 2005 Mercedes-Benz E320 Sedan

1 Answer

Wont start

Will need reprogramming thw key accroding with the procedure indicated in your Owners Manual or resynchnized your system visiting your delaer.

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Feb 10, 2012 | Pontiac Grand Prix Cars & Trucks

2 Answers

How to bypass theft system in my 91 seville

The easiest thing to do is lock the doors MANUALLY, which will NOT allow the secuity system to arm, Now if your talking about the PASSKEY ANTI THEFT, well bypassing that system is another invlved issue. Hope this helps

May 04, 2009 | 1991 Cadillac Seville

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Factory alarm 97 grand prix

1st the system alarm is intagrated into the engine control electronics, it can not be disabled without poss damage to ther systems and controls, 2nd the most common cause of your issue is the sensor in the ignition lock cylinder being defective, this is the most common issue on all GM anti-theft systems.

Nov 18, 2008 | 1997 Pontiac Grand Prix

4 Answers

Theft system armed

disconnect your battery wait 30 seconds then reconnect and it wll start for sure. if not get a new or clean your old key and make sure it is dry then try again. I have dealt with this a hundred times an think it has to do with worn chips on the keys/bad sensor in the ignition.

Oct 08, 2008 | 1995 Cadillac DeVille

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