Question about 1998 GMC Savana

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Passlock needed to replace ecm-purchased from auto recycler. How do you relearn security system?

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BCM controls your passlock system. All that is required is leaving your key in the igntion with it on for around 10-15minutes. Then attempt to start. The passlock system is self learning. Let me know if this works, if not we can trouble shoot from there. Thank you for using

Posted on Oct 05, 2008


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Posted on Jan 02, 2017


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I have a 2002 chevy pickup, lost the key, put a new steering column,will crank up and run for 10 seconds then die. I spray gas in the throttle body and it stays running as long as I'm spraying gas.

If you lost the key and you have passlock security system, the key is just a mechanical key. It's the key cylinder/tumbler that communicates with the passlock system. No need to replace steering column. Just my opinion.
You could get a locksmith to make you a key that will work or get a key from local dealership. If the key is the problem? The key has no pellet and no transponder.
Is there a security system lamp on the dash that is on or flashing? Any applicable trouble codes?
There is a relearn procedure, 10 minute segments, about three segments for a total of thirty minutes. Did you do the thirty minute procedure? Ok the make is a chevy, I don't know the model, may not matter?

Sep 23, 2017 | Cars & Trucks

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Wont start passlock not on got jump it starts then wont start got another jump wont start tried passlock relearn lites gagues work got jump it starts it wont start again wit jump took battery in itsok

Need to turn off passlock - Chevrolet - iFixit

iFixitThose of you that have stalling problems, it is not passlock. ... traction fault on the display when it shuts down or won't start and have to wait my 10 min to restart.

GM Passlock Security Light Issues - RepairPal
If you find yourself stranded, your engine won't start, and the security light is flashing, ... The most common repair is to replace the ignition lock cylinder or Passlock ... The warning light on the VATS system is similar except it does not have the ...

No Start Due to Failed Passlock Sensor : Pontiac Grand Am ... > Problems > Pontiac > Grand Am

Dec 05, 2015 | Cars & Trucks

1 Answer

2004 Chevy impala won't start sometimes

Is the "Security" light coming on?. If so, there is a problem with the Passlock key antitheft system. It is common for the ignition cylinder key detection contacts to go bad.

Replacing the key cylinder fixes the problem. The new cylinder has to be "relearned". See the internet and search for "2004 Chevrolet passlock system relearn procedure".

Sep 26, 2014 | 2004 Chevrolet Impala

2 Answers

Someone tried to steal my 2000 Chevy S10 pickup. They tore up ignition. I purchased a new ignition cylinder which came with 2 keys. I tried to do the 30 minute relearn but the security light does not stay...

You don't need to program key's with this anti-theft system , there is no chip inside . Did you get a correct lock cylinder. . On this system there is a pass lock sensor in side an the lock clinder has a magnet !
Passlock™ Sensor
The passlock™ sensor is inside the upper right side of the steering column. The passlock™ sensor contains 2 hall effect sensors. The tamper hall effect sensor is on the top. The security hall effect sensor is under the tamper hall effect sensor. Both of the hall effect sensors monitor the magnet of the lock cylinder through an opening. The tamper hall effect sensor is physically placed on top of the security hall effect sensor. This arrangement enables the tamper hall effect sensor to engage first if an intruder attempts to bypass the passlock™ sensor by placing a large magnet around that area of the steering column. There is a tamper resistor inside the passlock™ sensor in order to help prevent tamper to the system. Passlock™ equipped vehicles have a selection of 10 different security resistors ranging from 0.5K ohms up to 13.6K ohms. Installing one of the security resistors inside the passlock™ sensor will generate a unique passlock™ code. All 10 combinations of the passlock™ sensor have the same part number. However, you cannot simply replace the passlock™ sensor and expect the system to operate properly. Always start by performing the Diagnostic System Check first and following the instructions.
Body Control Module
The Body Control Module (BCM) contains the theft deterrent system logic. The BCM reads the passlock™ data from the passlock™ sensor. If the passlock™ data is correct, the BCM will pass theft. The BCM will then transmit the code password to the VCM/PCM.
During the tamper mode the vehicle may start. The vehicle will then stall. If the BCM receives the wrong passlock™ data, the VTD will immediately go into the tamper mode. The tamper mode will lock-out the vehicle fuel injectors for 10 minutes. The SECURITY indicator will flash while the VTD is in the tamper mode.
If the passlock™ sensor sends a correct password to the BCM when the ignition is in the ON position, the BCM will send a fuel enable signal to the VCM/PCM. The VCM/PCM will not disable the fuel due to any BCM message for the remainder of the ignition cycle.

You only need to do a relearn if one of these are replaced
Use this procedure after replacing:
• Passlock™ Sensor

Did you replace any of these ?

30 Minute Re-Learn Procedure
Turn ON the ignition, with the engine OFF.
Attempt to start the engine, then release the key to ON (vehicle will not start).
Observe the SECURITY telltale, after approximately 10 minutes the telltale will turn OFF.
Turn OFF the ignition, and wait 5 seconds.
Repeat steps 1 through 4 two more times for a total of 3 cycles/30 minutes ( 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).
Important: 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.
Start the engine (the vehicle has now learned the Passlock™ Sensor Data Code and/or password).
With a scan tool, clear any DTCs if desired (history DTCs will self clear after 100 ignition cycles).

May 18, 2017 | Chevrolet S 10 Cars & Trucks

1 Answer

Instructions replacing a brain in a 98 chevy blazer

I would find the problem first,changing the ECM is not a good idea.
will need on board programming to relearn crank position and passlock relearn. at least. And the crank relearn is a dealership(unless you have a really hi-end repair shop around) Still expensive.
ECM's rarely fail,I would suspect something else first,like mass air flow or cam sensor.No codes? next time it won't start you need to check for spark at the plugs and at least find out if it's spark or fuel that it lacks.

Jan 05, 2014 | Cars & Trucks

1 Answer

Alarm factory reset

If you are referring to the Passlock immobilizer, here is the relearn process.


Time required, approximately 10 minutes:

1. Insure that the battery is fully charged.
2. Use the scan tool in order to clear the DTCs.
3. Turn the ignition switch from the OFF position to the CRANK position attempting to start the vehicle. The vehicle will start and then stall.
4. Leave the ignition switch in the ON position while observing the security indicator.
5. When the security indicator turns off, which can take up to 10 minutes, turn the ignition switch off. Wait 10 seconds.
6. The BCM and the PCM will learn the new code on the next start attempt.

Sep 13, 2013 | 2000 Cadillac Eldorado

2 Answers

2002 Saturn L200. Dealer told me I needed to replace the PCM and the passlock module. $800.00. Is there a way to bypass the passlock B.S. Please help car is not reliable. Have children.

no the power control module runs the whole car and the pass lock you maybe can do without it controls the security systems but the pcm is the brain of the car

Sep 15, 2010 | 2002 Saturn L-Series

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