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B2958 no start - 2005 Buick Century

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I have tried all the tricks and i still cant get my 2000 impala to start because of the security system.HELP


How do you know it's the security system ? Light lit on the insturment cluster ? If it is there are DTC'S - diagnostic trouble codes stored in the BCM - body control module . There are no tricks , have codes checked do the diagnostics for that code , fix the problem an it will start .
The vehicle theft deterrent (VTD) functions are provided by the Passlock system. Passlock consists of the following components:
• A standard ignition key
• An ignition lock cylinder assembly, including a Passlock sensor
• The body control module (BCM)
• The powertrain control module (PCM).
The Passlock sensor contains a magnet on the lock cylinder and a hall effect switch on the surrounding assembly. When you rotate this cylinder using an ignition key with the proper mechanical cut, the magnet on the lock cylinder activates the hall effect switch. When activated, the Passlock sensor provides a unique resistance value to the Passlock data circuit of the BCM. The resulting voltage is measured by the BCM. This voltage value is compared to one stored in memory (a learned value). If the Passlock data voltage value matches the learned value, the BCM sends a password, via the class 2 serial data link, to the PCM. The PCM compares this value to one stored in memory (a learned password). If the passwords match, the PCM enables engine starting.

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

Do yourself a favor , take it to a qualified repair shop .

Jun 26, 2017 | Cars & Trucks

1 Answer

Why is my security light coming on in my 03' chevy impala when driving im scared it will stop on me when doin tht


Hard to say why the light comes on , may have a diagnostic trouble code stored in the BCM - body control module ! Do you have a bunch of other key's on the same ring as the vehicle key ?
Passlock™ System
The theft deterrent system has been incorporated into the body control module (BCM). The theft deterrent system prevents the vehicle operation if the correct key is not used in order to start the vehicle. The ignition key turns the ignition 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). The message enables the fuel injectors and the crank relay.
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 passkey 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 indicator
• The powertrain control module (PCM)
When anyone of these codes set the BCM will turn on the SECURITY light !
DTC B2947
DTC B2948
DTC B2957
DTC B2958
DTC B2960
DTC B3031
DTC B3033
DTC P1626
DTC P1629
DTC P1630
DTC P1631

Your best bet , take it to a qualified repair shop an have it checked !Here are some reasons for the light to come on .
Conditions for Setting the DTC
The BCM detects a short to ground on the Passlock sensor power circuit for 1 second, with the ignition switch in the ACCESSORY, ON, or START position.
The PCM has detected a loss of the state of health serial data message from the theft deterrent system.

May 29, 2017 | Cars & Trucks

1 Answer

My '98 GMC Jimmy's security light flashes & I can't start my engine! I'm the owner & am using the original ignition key!


How many miles on the vehicle ? Thing's wear out , thousands of times of put the key in an turning it .

Have you tried to do a relearn ?

30 Minute Procedure
Ensure that the battery is fully charged.
Use a scan tool in order to clear the Passlock™ DTCs.
Turn the ignition switch from the OFF position to the CRANK position, and then to the RUN position.
The vehicle will start and then stall.
Leave the ignition ON until the security telltale turns OFF in 10 minutes.
Repeat Steps 3-5 for 2 more times (3 times total)
The Passlock™ controller will learn the new data on the next start attempt.
Use a scan tool in order to clear all DTCs.

Don't worry about the scan tool part , just do the relearn . If that doesn't work you will probably have to take it to a dealer .

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

If the relearn doesn't work one of these DTC'S - diagnostic trouble code's is stored .

Mar 08, 2017 | 1998 GMC Jimmy

1 Answer

How to fix vats on 98 sonoma


What's wrong with it , have you had it checked for DTC'S - diagnostice trouble codes .

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 the body control module (BCM). The BCM will determine the validity of the passlock™ data. The BCM 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/PCM and the BCM 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 Connector Circuit Description in Wiring Systems.

Telltale Indication
Condition
ON constant for 3 seconds, then OFF
The bulb check occurs upon power-up (Ignition 1 and crank).
ON constant for 3 seconds, OFF momentarily, ON constant/ignition OFF
DTC (current) is set with the ignition ON (see DTC B2947, B2948, B2957 and B2958).
ON constant/ignition OFF
The TBC fuse is open or an open in CKT 1140
ON constant for 3 seconds, FLASH for 10 minutes, then OFF
Occurs when a Passlock™ sensor has been replaced and the ignition switch has been turned from the OFF position to the CRANK position. This sequence occurs 3 times.
FLASH with the ignition ON
The Passlock system is in a tamper mode (see DTC B2960 and B3033).
ON constant for 3 seconds, OFF momentarily, then ON constant for 10 minutes, then OFF
Occurs when a new BCM or a new PCM/VCM has been installed, and the ignition switch has been turned from the OFF position to the CRANK position. This sequence occurs 3 times.
ON constant for 3 seconds, OFF for 2 seconds, then ON constant
The IPC is unable to communicate with the BCM.


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 .

Your best bet , take your vehicle to a qualified repair shop .

Feb 17, 2017 | 1998 GMC Sonoma

1 Answer

Thinking 99 Chevy Astro van security light on solid band starts with cuts down is there anyway to bypass security without spending a lot of money


If the light is on there are code stored ! Not in the PCM/ECM engine computer . In the BCM , do you know what that is ? body control module ! Need a factory scan tool or equivalent to check !
DTC B0688 Security System Indicator Circuit High
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
DTC C0559 EEPROM Checksum Error
Why does everyone want to chop up things , by pass etc... The right fix could be cheaper then ruining your vehicle . Chopping up wiring harnesses . Their are by pass module , don't know how much they are . It may or may not fix the problem . Pulling the code and doing the diagnostics is still the best solution .

Jan 07, 2017 | 1999 Chevrolet Astro

1 Answer

I have a 2000 buick century 3.1 my security light still staying on after i changed the key cylinder and the electrical key switch whatelse can that be ??


Having the vehicle checked for codes should have been the first thing done . Security light on ,a code is stored in the control module that controls the anti-theft system ! This is if you want it fixed right !
Important: If the wrong ignition key is used in an attempt to start the vehicle, a Data Trouble Code (DTC) will be set and the Body Control Module (BCM) will not send a fuel enable or starter enable message to the Powertrain Control Module (PCM) for three minutes even if the correct ignition is used.
The Pass-Key II® Theft Deterrent system prevents vehicle theft by disabling the starter motor and fuel system. If the Body Control Module (BCM) dose not identify the use of the correct ignition key to start the vehicle, the (BCM) will communicate a message to the Powertrain Control Module (PCM) which will disable the crank relay and fuel delivery to the engine.
When the (BCM) identifies the use of the correct ignition key (resistor pellet) to start the vehicle, the (BCM) will send a fuel enable and starter enable message to the (PCM) which will allow the vehicle to start.

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 B3094 No Response from ECM/PCM Received

or you can do a by pass that may or may not work ! You could measure the resistance of the pellet on the side of the key , then go to radio shack a by a resistor of the same value ! Then find the wires under the dash that come from the ignition switch ! Solder the resistor into the harness side wires , not going back to ignition switch . The wires break or contacts inside ignition switch do . You could check resistance with ohm meter . Put key into the ignition switch , find those wires i said about before . Check resistance at the wires under dash , is it the same resistance as pellet ?

Dec 17, 2016 | Buick Cars & Trucks

1 Answer

How do you put the resistor in the passlock system on a Oldsmobile Alero


You don't say if the security light is lit ? Is it ? If not , it's not a anti-theft system problem . An the passlock system on your vehicle the passlock sensor is part of the ignition lock cylinder . No resistor ! If the security light is lit you need to have it check for codes . There are a number of DTC'S that can set .
DTC B2947
DTC B2948
DTC B2957
DTC B2958
DTC B2960
DTC B3031
DTC B3033
DTC P1626
DTC P1630
DTC P1631
DTC P1632

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.

Nov 04, 2016 | Oldsmobile Cars & Trucks

1 Answer

2005 Saturn ion, Starting failure in colder temps.


Have the vehicle checked for DTC'S - diagnostic trouble codes .
Chevy GMC Passlock II Bypass
This works fine until your battery dies or you have to get your battery replaced. What you did was put your vats in Fail Enable mode. Fail Enable: This mode is to help keep the motorist with the right key from being stranded. If a failure happens to the PassKey system AFTER a valid start, this mode is initiated (Which is what you simulated in the video). It allows the vehicle to be restarted, even with a failure present. The security light will remain illuminated to let you know a failure is present. However, this also means that the car can be started w/o a key, and is vulnerable to potential thieves. If battery power is lost while in fail enable mode, this mode will be lost and the next attempted start w/ the system malfunctioning will cause Tamper Mode. Tamper: This mode happens when the vehicle is cranked, and the resistance value as seen by the module is not the same as the value stored in the module. When this happens, the module shuts down for 4 minutes. Even if the correct resistance is then seen, the car will not start for the 4 minute "time-out". Each attempt to start the car within the 4 minute "lock out" period, will reset the timer. The security light will also illuminate for the 4 minutes. The Start Enable Relay will not energize and the Fuel Enable signal will not be sent. I'm providing this info so that next time you get your battery replaced, you know that you have to reconnect those wires, start it successfully with the key then disconnect the wires while its running and your vats will be in Fail Enable mode until the battery either dies or gets disconnected. Pin this so others can see too! :)

DTC B2957
DTC B2958
DTC B2960
DTC B3031
DTC B3033
DTC P1626
DTC P1630
DTC P1631
The Passlock System is provided in order to prevent vehicle theft if the ignition lock cylinder is forced to rotate. The Passlock controller reads the coded Passlock data signal. The data consists of a voltage generated by a voltage divider network created between the Passlock assembly and the Passlock controller. If the data is correct , indicating rotation of the lock cylinder with the proper mechanically cut key, then the Passlock controller sends a password to the powertrain controller via serial data to indicate that engine starting should be allowed. The Passlock controller also interfaces with the driver displays subsystem to indicate, via the security indicator, the Passlock subsystems status and acute subsystem failures.

Aug 16, 2017 | Saturn Cars & Trucks

1 Answer

2002 chevy malibu...can i get a remote starter to by pass the anti theft system


What makes you think this is a anti-theft system problem ? Is the security light lit on the insturment cluster ? When you turn the key to start does the starter spin the engine ? Crank no start ! Or when you turn the key to the start position the starter does nothing . No crank no start . A aftermarket remote start won't by pass anti-theft system . Your best bet would be to take to a qualified repair shop and have it checked for DTC'S - diagnostic trouble codes . Before you let someone start hacking up wiring circuits .
DTC B2947
DTC B2948
DTC B2957
DTC B2958
DTC B2960
DTC B3031
DTC B3033
DTC P1626
DTC P1630
DTC P1631
DTC P1632

Do you know what DTC'S are , these would point to an area of trouble an to a fix .

Aug 21, 2017 | Cars & Trucks

1 Answer

Only getting 2.3 volts at fuel pump


only getting 2.3 volts at fuel pump

Sounds like you have 2 problems. The buzzing relay could be a bad relay, or
the connection in the fuse block. Have had some problems in the block with corroded wires, or
loose connections that the relay plugs into.
The security light is the next thing. With the security light on/flashing, the car will not start. With
that light on, the computer is disabling the fuel injector circuit. After a try to start, it wont or dies,
leave key on for 10-12 minutes, or until light goes out. Then turn off key for 10 seconds, turn key
to 'on' position for 5 seconds, then turn to start and it should. This is a theft re-learn procedure,
and will sometimes remedy the situation for the time being, but will have to repair the problem. A
scanner should show codes(s) like b2958, b2960.
A common problem is the ignition cylinder and/or the ignition switch. With the buzzing of the relay,
i would say all this may be related to the ignition switch. A low voltage supply to any of the circuits
that the switch feeds will give strange electrical conditions. If going to replace the ignition switch,
then also do the cylinder at the same time. With all things described, sure sounds like the ignition
switch.
P.S. The locks may be related to the ignition switch problem or not at all. With that said, would
suggest looking at the BCM(body control module)It control locks, and also has allot to do with the
security system. See picture at bottom of this page of corroded BCM connectors.

Apr 20, 2012 | 1997 GMC Sierra

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