Question about 2004 Chevrolet Impala

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The security comes on and eventually the car won't start. The manual stated that it is the passlock. The security message will blink. When it stops blinking, the car will start.

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  • Anonymous Mar 16, 2014

    passlock , car wouldn't start

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There is a sensor on the back side of the tumblers in your ignition switch. This is the pass key sensor. Its bad. Have your switch replaced. Don't let anyone try to trouble shoot this. I have had to replace about 125 of these and they always crank and run afterward. Hope this helps. Good luck.

Posted on Jul 23, 2009

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Posted on Jan 02, 2017

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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

2 Answers

Security light is blinking and car won't start just replaced the fuel pump car will start for a couple secounds and dies


you need your manual it tells how to reset security system or give dealer a call they should tell you

Jun 20, 2014 | 2001 Pontiac Grand Am SE

2 Answers

Security light blinks car won't start disconnected the battery used a different key still won't start


need to reprogram the security system. turn the key to start position then to run . let the key stay on until the light stops flashing. repeat these steps 3 times then the car should start if there is not a problem with the pass-lock sensor in the ignition switch or the BCM( body control module).

Aug 07, 2011 | 2004 Pontiac Grand Am

2 Answers

Saturn L200 Passlock Problem


I have a very untechnical solution to this problem and I can't for the life of me remember where I heard it but it sure does work. Turn the igniton to ON so that the dash lights up. Eventually the others lights go out and the flashing "Securty" light stays. Keep the driver side door slightly ajar and sit and wait for that Security light to stop blink, usually 5-10 minutes. Once it stops blinking you can start your car. I can't promise that you won't have the starting problem again, but it will happen with decreasing frequency. Ultimately you need to have the passlock issue handled at a dealership. I say DEALERSHIP because it's a manufacturer flaw and they should be made aware of this issue everytime. They're also best equipped to handle it.

Jul 28, 2010 | 2002 Saturn L-Series

2 Answers

2001 grand am gt 3.4 v6, has fire and fuel cranks but wont start


check to see if the security light is blinking, if it is. thats an easy fix.

Oct 18, 2009 | 2001 Pontiac Grand Am SE

2 Answers

Fuel issue


I hope you arn't pay for all this tell them to diag with a guarentee or you are going to the state to report them & get your money back!!!!!!!!

Sep 05, 2009 | 2001 Oldsmobile Alero

2 Answers

Car ran fine night before...next morning would not start. Replaced fuel pump, filter and switched relay but still had no luck. What else should we do?


CHECK TO SEE IF SECURITY LIGHT IS STAYING ON WHEN YOU TURN THE KEY TO RUN POSITION(NOT START) NORMAL OPERATION IS SECURITY/ANTI THEFT LIGHT ON FOR A FEW SECONDS THEN SHOULD GO OFF. IF ITS STAYING ON VEHICLE IS IN THEFT MODE WHICH WILL DISABLE THE FUEL INJECTORS BECAUSE CAR THINKS ITS GETTING STOLEN. MOST LIKELY CAUSE FOR THIS IS PASSLOCK SYSTEM(SENSOR IS LOCATED IN STEERING COLUMN)

Sep 02, 2009 | 2001 Oldsmobile Alero

2 Answers

Starts but then it shuts off


Make sure those 3 wires on the passlock sensor are good.That sensor is on the lock cylinder on the right side of the steering column. You may want to check the wires on the ignition switch also.(green,black).But I would look at the sensor 1st since that is where they hook up those remote starters as far as I know.

Dec 03, 2008 | 1997 Oldsmobile Achieva

1 Answer

1994 gmc safari


Sounds like your Passlock security system went into the tamper mode. If your dashboard security light blinks when the ignition is turned on, your Passlock security system is disabling the injector module, preventing the car from start. Try this:
1- turn the ignition on and just touch the starter, without getting the motor to fire, then leave the ignition in the "on" position. The security light will blink for about 10 minutes. When the light stops blinking, turn the ignition off and leave off for 3 minutes.
2-repeat the step #1, 3 or 4 times. You will know that is fixed when you turn the ignition on and the security light does not blink, then the car will start. Make sure to stay inside the car when you're doing this, as opening the doors will trip the security tamper mode on again. Once the tamper mode is off, the car starts and opening the doors will not trip the Passlock tamper mode.

Aug 06, 2008 | 1994 GMC Safari

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