Question about 1999 Chevrolet Cavalier

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Car starts and dies almost immediately

Recently had ignition switch replaced by a licensed mechanic and he reset the passlock info. Car started fine for about a week. Drove it about 400 miles from home, turned off. Now when I turn key it starts and dies almost immediately. The theft lite illuminates so I tried everything from disconnecting battery leads and pulling fuses to no avail. Need Passlock schematics, help and a lot of luck.

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Turn key to on position for ten mins then your theft system light should turn off then turn key to off postion and then try to start car. Should work if not go to and go to forums and go to maitnance

Posted on Nov 01, 2009

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I had a Ford F150 New at dealers, It did the same thing, come to find out the dealer had given me the wrong key, and the chip did not match the ignition system. Maybe your chip has malfunctioned.

Posted on Jul 29, 2009


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Posted on Jan 02, 2017

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96 buick skylark starts & stalls, theft light on not flashing. Dissconnected map sensor still starts & stalls. No chip in key, changed fuel filter. whats goin on here?

This is pass lock antitheft system not pass key, pass key system is found on newer gm vehicles and has a transponder in the key. Pass lock system has a hall sensor on the lock cylinder.
System Operation
If the mechanical key is not used to start the vehicle, the PASSLOCK?"¢ system is designed to prevent vehicle operation. The mechanical key, in normal operation, will turn the PASSLOCK?"¢ lock cylinder. The PASSLOCK?"¢ lock cylinder will relay a Resistance Code (R-Code) to the instrument cluster. Within a preset time window started from an ignition switch input and will send a coded password to the powertrain control module (PCM). The instrument cluster will determine the validity of the R-Code. For the fuel injectors to operate normally, the powertrain control module (PCM) receives the correct code
Passlock System
Disabling the engine unless the PASSLOCK?"¢ lock cylinder is correctly engaged by a mechanical key. The PASSLOCK?"¢ system is designed to prevent vehicle theft. This system is similar in concept to the Passkey system. The PASSLOCK?"¢ eliminates the need for a key mounted resistor pellet. The components of this system are as follows:
PASSLOCK?"¢ lock cylinder

Ignition switch

Instrument Cluster and Powertrain control module (PCM)

If the theft light is on there is a problem and a code set. You can try to do reset . Turn the key on , don't try an start the car . Let key on for 10 min. till the light goes out, if it goes out turn ignition off an wait a couple of min. then start the car

Dec 31, 2014 | 1996 Buick Skylark

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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

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try checking the connections at the battery if u haven't already! Is your check engine light on?

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Replaced ignition car wont start

Here is a link that can help you with the bypassing of your Passlock antitheft system.

Mar 25, 2012 | 2000 Oldsmobile Alero

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I have a 2000 monte carlo ss 3800 series. Sometimes the security light comes on and car will not start. When security light is not on, car always starts.Any ideas?

The passlock is having issues try this procedure and see if it helps. If it does not the passlock and ignition tumbler may need replaced.

1) Put the key in the ignition and turn to the "ON" position. Leave it that way for 10 minutes. After 10 minutes turn the key and take it out. Repeat this process (2) more times (3 times, 30 minutes total) This should reset the PASSKEY system to recognize your key

Jan 12, 2011 | 2000 Chevrolet Monte Carlo

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The car fires but stops immediately

I had a problem with a 97 Achieva recently.Someone else replaced the PCM/ignition switch and passlock sensor.I replaced the ICP.Engine would turn over but wouldn't start and the security lamp was dim and flashing and then it would go solid.I tried the wait 10 minutes thing but,the light would never go off! I put the original passlock sensor back onto the lock cylinder. But this is what fixed the problem.I cleaned the contacts on the black wires and green on the ignition switch with tv tuner cleaner! After I cleaned those contacts the security light was flashing brightly.So I turned the key to run and left it there.After a few minutes it stayed on solid.I waited about 10 minutes but the light never went out.So I turned off the switch and then tried starting.It started right up and the security lamp flashed and then went off.Has started every time since.Note:I also scraped the pins that I cleaned with the cleaner with a knife.

Nov 11, 2009 | 1997 Oldsmobile Achieva

3 Answers

My battery in my car kept dying so my boyfriend had to go buy a new one he took the old battery out and was running the car on the alternator because it wouldn't do anything with that old battery in it. He...

Sounds like the alternator isnt charging the battery to me. Try getting a Ohm/Volt meter and testing the lines that go to the alternator. If the show any kind of voltage then all should be good, if not then you have to trace the wire back to the battery fuse block and try on both side of the fusable link. If you are getting a reading on the battery side of the link but not the other side you will have to have the wire replaced or run a new one. As far as it not starting now, from replacing the battery I am not 100% sure. I think that his uncle is correct and you would have to reset the security system, the mechanic should know how to do that.

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Car running fine. Has 160K miles. Just cuts out for no reason. Pull over starts immediately first time and off we go. Gas filter clogged? The only code P1457 was for a vapor leak. We reset that and now...

does it cut out while driving?? If it cuts out while driving does the speedometer drop to zero even if the car is moving?? try shaking the key while the engine is started and the vehicle is in should die?? If yes is your answer to any of these questions, its a faulty ignition switch. There is a recall for this, call your honda dealer for info and possible replacement!! hopefully this helps

Jul 13, 2009 | 1999 Acura TL

1 Answer

2005 ignition switch

Good day;
The following is the removal of the switch
1. remove the steering column trim covers.
2. disconnect the ignition switch harness connector.
3. turn the switch to the run position


4. remove the switch screws
5. remove the ignition switch from the steering column

if the ignition switch is replaced and a learn procedure is not performed the engine will crank but not start or will start and stall immediately.

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 telltale. after approx 10 min the telltale will turn OFF
4. turn OFF the ignition and wait 5 seconds
5 repeat steps 1-4 two more times for a total of 3 cycles (30 min) the vehicle is now ready to relearn the PASSLOCK sensor data code and or passwords on the next ignition switch transition from OFF to CRANK.


6.start the vehicle the vehicle has now learned the passlock and or password
7. if you have a scan tool clear any codes if needed or disconnect the battery for 30 sec. the history DTC will self clear after 100 ignition cycles.

hope this helps


Jul 13, 2009 | 2008 Chevrolet Cobalt

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