How to Fix Passlock for Chevy Vehicles. A temporary fix is to leave your key in the ignition, at the “auxiliary” position for about 10-15 minutes until the security light shuts off. When the light shuts off you can try to start the engine again. Rinse, repeat, and cry.
- How to Fix Passlock for Chevy Vehicles ∞ A temporary fix is to leave your key in the ignition, at the “auxiliary” position for about 10-15 minutes until the security light shuts off. When the light shuts off you can try to start the engine again. Rinse, repeat, and cry.
How can I bypass passlock?
Leave the key in the ignition for 10 minutes. Turn the key to the ‘off’ position — and leave it there for 20 seconds — after the anti-theft light stops blinking. This disables the Passlock system; it is ready to ‘relearn’ your key.
Where is passlock sensor located?
There is only one PassLock system. There is no sensor in the ignition lock cylinder, the Passlock sensor is in the ignition lock cylinder housing, and there is a magnet in the ignition lock cylinder.
What is passlock shutdown?
Passlock works to prevent vehicle theft by shutting of the fuel injectors if a thief tries to remove the lock cylinder from the vehicle. Removing the lock cylinder with a slide hammer is a very common theft technique.
Does passlock disable starter?
The PASSLock system does not disable the starter; it only disables the fuel after the engine has started. If the vehicle will not crank, PASSLock cannot cause this condition. When a PASSLock-equipped vehicle is being started, the instrument panel warning light for PASSLock remains on until the engine starts.
Will disconnecting battery reset anti theft?
It is another way to solve the problem of anti theft system car wont start. Disconnect the positive terminal of the battery for a minute or two. It will reset the computer system and your car is likely to kick off.
Can you disable anti-theft system?
To turn off the anti-theft system, use your remote to press the unlock button key. It is advised to use the key to unlock the door and turn on the ignition switch. If that does not work, try to lock the door on the driver’s side using the key while you are out of the car.
What triggers PassLock?
Passlock uses a coded lock cylinder that essentially stops the engine from running until the proper key is detected. When the key is inserted into the ignition, a magnet on the cylinder creates a signal to the ECM (engine control module) that essentially says everything is ok to start and run.
How long does it take for PassLock to reset?
This will take approximately 10 to 15 minutes. Start the car immediately once the ‘Theft Sys’ light stays on steadily. Remember to not turn the key off. Your car will now reset the passlock system and start as usual.
How do you disable a factory car alarm?
A large number of factory alarms turn off once you put the key in the lock of driver’s or even passenger doors. You can also try a similar method – pressing the lock or unlock button on the remote fob. Unlocking the doors with the right remote fob will shut down most fabric alarms.
Why does the theft light flash?
The Anti-theft Light in the dash of your car should flash periodically to show that the system is engaged and active. You have to lock the doors of the car (without it running) for the alarm to engage.
Does anti-theft light drain battery?
Most modern cars that include a factory installed theft deterrent system use a low power LED that draws between 5 and 10 mAmps. This would take a very long time to drain a good battery. Most GM cars can sit in an airport parking lot at least a month and still start. Eventually it will drain the battery.
How do you unlock theft deterrent?
Press the unlock button, get out of the car, but leave the door open, then press the lock button on the door, and shut it. Simple as that. This fix will work most of the time. In the odd event that something goes wrong, you can also perform a hard reset.
What is a passlock sensor?
The Passlock sensor monitors the position of the lock cylinder and relays an analog Passlock signal to the body control module (BCM). The BCM determines the validity of the Passlock signal, then sends a password to the powertrain control module (PCM). The Passlock sensor contains two Hall effect sensors.
Passlock fixes
Anti-theft systems were manufactured by General Motors in a variety of designs. VATS, PassKey, and PassLock are examples of such technologies. The troubleshooting and reset processes are different for each of the devices listed above. PassLock appears to have the greatest failure rate of all the options. As a result, if you have a key that does not have a chip in it, the odds are that it is a PassLock system. Troubleshooting and repairing a PassLock system are described in this article. However, here are some other articles that may be of use.
To view the PassLock system’s issue codes, please visit this page.
If you have a PassKEY system, you may view the reset method by clicking here.
The General Motors Passlock system is quite straightforward, especially when compared to systems used by other manufacturers.
- The way it works is as follows: When you initially switch on the ignition, the PCM supplies electricity to the fuel pump, injectors, and ignition system, among other components.
- When the Passlock system is activated, it checks to see if a sensor located within the lock cylinder case has delivered the necessary voltage to either the instrument panel cluster (IPS) in earlier cars or the body control module (BCM) in newer vehicles.
- The PCM keeps the fuel and ignition running smoothly, and you’re ready to go.
- The lock cylinder itself doesn’t actually accomplish much other than certify that a correctly cut key has been inserted, after which the tumblers allow rotation to take place.
- The presence of the magnet is detected by the sensor.
- The sensor provides an output voltage of 4.9 volts to the IPC/BCM.
- Each sensor is constructed with a resistance value that is one of ten possible choices.
So, if you’ve been paying attention, when you flip the key to the ON position, the IPC/BCM puts out 12 volts and receives 4.9 volts in response.
Unless the IPC/BCM detects a drop in voltage, or if the returning voltage is not stable, the coded message will not be transmitted, and the car will start and eventually stall, with the SECURITY light flashing in the process.
This results in the sensor reporting a different return voltage, which the IPC/BCM interprets as a ‘tamper’ signal, and the sensor is deactivated.
The system is comprised of four major components: 1) Passlock lock cylinder with a key.
Fortunately, they’re not too costly and are simple to replace.
Putting the sensor through its paces: A wiring schematic may be found by clicking here.
Install a digital multimeter set to DC volts and connect the red meter lead to the white wire pin on the supply connection and the black meter lead to the black wire pin on the supply connector.
You should be able to see 12-volts.
To check for battery voltage if you don’t see it, backprobe the white and black wires at the IPC/BCM.
Close that gaping hole.
If you aren’t getting any electricity, check your fuses first.
The red meter line should be used to backprobe the yellow wire while the black meter lead should be connected to ground.
You should be able to see 4.9 volts.
If you do not detect 4.9 volts during ON or a lower voltage during START, the problem is most likely with the cables leading to the sensor or the sensor.
After changing the lock cylinder case, you must go through the process of relearning the lock.
The majority of people are unaware that the Passlock system is specifically designed to be diagnosed using a scan tool.
It does, in fact, set difficulty codes. To view the codes and their meanings, please visit this page. Rick Muscoplat was born in the year 2012. Rick Muscoplat posted a blog entry on
GM Passlock Security Fix
| This article describes how to bypass the’Passlock Sensor’on several models of GM cars.No soldering is required.You must perform all the steps. |
The Problem
You attempt to start your General Motors automobile. The engine begins to run, but dies after one or two seconds, and the ‘SECURITY’light begins to blink intermittently. OR. You’re driving along when, for no apparent reason, the ‘SECURITY’light illuminates completely and remains illuminated. After you have shut down your vehicle, the SECURITY light will remain illuminated until you restart your vehicle. This is a prevalent problem on the following General Motors automobiles: Oldsmobile Alero from 1999 to 2004 Chevrolet Malibu from 1997 to 2003 Pontiac Grand Am from 1999 to 2004 The ‘Passlock Sensor,’ which is a component of the Ignition Lock Module, is frequently the source of the problem.
- ‘If the ‘SECURITY’light flashes or remains illuminated after attempting to start the engine, wait ten minutes with the key in the ON position until the light goes out.
- Unfortunately, you will most likely have to go through the same process all over again a few of weeks later.
- You will be guided through the steps necessary to bypass the’Passlock Sensor’on a 2002 Pontiac Grand Am, as well as how to turn off the ‘SECURITY’light for good.
- There are only slight variances in the methods used to remove the radio from the vehicle in order to access the wiring.
- They are color coded as follows: black (analog return), white (power), and yellow (analog data).
- By removing the radio from the dashboard and reaching through a hole in the radio compartment toward the steering wheel, the three wires may be reached and accessible.
- Create a low-cost, simple circuit to take the role of the Passlock Sensor. Find the three wires that link thePasslock Sensor to theBody Control Module and replace the Passlock Sensor with our circuit. To ensure that our Body Control Module recognizes our new circuit, we must do the ‘Relearn’ Procedure.
To replace the Passlock Sensor with a low-cost, straightforward circuit, follow these steps: Find the three wires that link thePasslock Sensor to theBody Control Module and substitute our circuit for the Passlock Sensor; then To ensure that our Body Control Module recognizes our new circuit, we must complete the ‘Relearn’ Procedure.
Supplies Needed
Purchase a Mini Terminal Block from Radio Shack, as well as a box of 2200 ohm (2.2k-Ohm) resistors from Amazon. You will not require all of them. However, you will most likely be unable to purchase only one.
It is possible to order the components from Digi-Key Electronics if your local Radio Shack store has gone out of business. Listed below are links to the 2.2k-ohm Resistor and the Terminal Block, respectively. You will also require the following equipment:
- Needle Nose Pliers
- Small Screwdriver
- Wrenches and Nut-Drivers
- Sharp knife for cutting and stripping wires
- Large Screwdriver
- Needle Nose Pliers
- Needle Nose Plires
- Needle No
Building A Dummy Passlock Sensor
Replacing the Passlock Sensor with Our Module
Important: Before doing any of the following procedures, disconnect one of the battery’s terminals from the battery. Take off the bezel that surrounds your radio. Using a big screwdriver or a solid dinner knife, pull it open until it comes away. As soon as you’ve gotten it unstuck, separate the wires that link the two lights on top of the bezel, as well as the cigarette lighter socket, from the vehicle. After that, you may put the bezel away. Remove the three screws holding the radio in place with a 5/16-inch socket and a ratchet.
Disconnect the wiring connection and the antenna wire from the radio and place it somewhere safe.
| On the left side of the radio cavity, there will be an opening, through which you will be able to see the Ignition Switch. Three thin wires, possibly taped together with fabric tape, will be visible coming from the top of the ignition switch. They will be near the end of the switch where the key is inserted. If they are wrapped with black fabric tape, unwrap them and separate the three wires so you can determine which is yellow, black, and white.CAUTION: If a remote start or alarm system has been installed on your vehicle, the wiring has probably been modified. In that case, do not continue with this project. It will not work! |
Make a clean cut across the yellow and black wires, leaving as much of the wire as possible on the ends that do not connect to the ignition switch. Insulate the ends of the two wires that connect to the ignition switch and reposition them so that they are no longer in the way. You have completed your task with them. Remove 3/8 inch of insulation from the end of the black wire and then twist the bare strands together to complete the circuit. Repeat the procedure with the yellow wire. Using your fingers, insert the stripped end of the black wire into one of the vacant holes on the terminal block of the Dummy Passlock Sensor (see illustration).
To install your Dummy Passlock Sensor, insert the stripped end of the yellow wire into the opposite terminal of the sensor (as shown in the photo) and tighten the screw to hold it in place.
Reconnect the battery cable to the battery terminals.
The 10 Minute Re-learn Procedure
The key should be inserted into the ignition switch before attempting to start the vehicle. It should start, then stall, with the ‘SECURITY’light glowing throughout the process. (In extremely rare instances, the automobile may continue to operate while the security light does not glow, but this is only possible if you are really fortunate.) Leaving the ignition in the ON position and waiting up to 15 minutes should resolve the situation. After relearning the security signal, the Body Control Moudle should be turned off, and the ‘SECURITY’light should be turned off.
The ‘SECURITY’light should be turned off during this period, and the automobile should continue to run.
It’s possible that you’ll have to try the more involved re-learn technique mentioned below.
The 30 Minute Re-learn Procedure
If the 10 minute re-learn technique described above does not successfully turn off your ‘SECURITY’light and allow you to start your car, there are three other components that might be the source of your difficulties.
- Broken or corroded wiring or connections
- The Body Control Module (BCM)
- The Powertrain Control Module (PCM)
- And other components.
Before attempting to replace the BCM or PCM, you should first try the 30-minute Re-learn Procedure, which is detailed in the General Motors Service Manual. It is presented here in its entirety. a thirty-minute period Learn the proper procedure. To complete this task, you will need the following tools: None
- Turn the key in the ignition while the engine is turned off. Attempt to start the engine, then turn the key to the ON position (the car will not start)
- Maintain close attention to the security clock
- After roughly 10 minutes, the clock will switch off. To turn off the ignition, press the button for 5 seconds. Steps 1 through 4 should be repeated a total of two more times for a total of three cycles/30 minutes. Upon the next ignition switch transition from OFF to CRANK, the vehicle will be ready to relearn the Passlock Sensor Data Code and/or passwords. IMPORTANT: When the car’s ignition switch is switched from OFF to CRANK for the second time, the vehicle learns the Passlock Sensor Data Code and/or password. You must first switch off the ignition before attempting to start the car
- Then start the engine
- Turn off the ignition. This means that the car has now figured out the Passlock Sensor Data Code and/or password. If necessary, use a scan tool to clear any DTCs that have accumulated. DTCs from the past will automatically clear after 100 ignition cycles.
If nothing you’ve tried so far has resulted in you being able to start your car and turn off the ‘SECURITY’light, check to see if the wiring between the bypass module you made and your BCM is in good working order. The BCM is placed under the glove box, behind a kick panel that can be readily removed to get access to the computer system. It is held in place by two fasteners. Two screws are positioned about 2 1/2 inches below and to the left of the bottom left corner of the glove box door. The first is a hex-head screw.
Using your fingers, push the fastener out of the hole by pulling out on the middle of the fastener and then pulling out on the center plug of the fastener.
- Remove all three connections from the Body Control Module and set them aside. Slide the Body Control Module to the right until it is no longer visible. It will need some work, but it will eventually come loose. Make sure the connections are not rusted by inspecting them thoroughly before use. If there is any water inside, shake the unit and listen for it. Assuming there is no problem with the Body Control Module, just slide it back into position, making sure it is securely fastened to its mounting bracket. Ensure that all three connections on the wire harness are clean and free of corrosion by visually inspecting the contacts on each connector. Providing that the vehicle started successfully before you began disassembly, it is fair to presume that the Body Control Module is in proper working order 90 percent of the time (There are no guarantees in life!) Reconnect the two outside connections on the Body Control Module to the rest of the system. The middle connection should be left dangling down. Measure the resistance between the pins A6 and B6 of the center connection with an Ohmmeter to determine the resistance. This is not the connector on the BCM, but rather the connector on the end of the wiring harness. The resistance of the resistor should be nearly the same as the resistance of the resistor that you put to the circuit. (about 2200 ohms.) It is likely that you have a wiring issue, and you will want a wiring diagram for your car in order to repair it. The wiring schematic for the 2002 Pontiac Security System may be found at the bottom of this post. To see the wiring diagram in its entirety, right-click on it and select ‘View Image’ from the context menu.
The Body Control Module should have all three of its connections disconnected. Body Control Module should be removed by sliding it to the right. However, it will eventually come loose with a little work. Make sure the connections are not rusted by inspecting them thoroughly first. If you hear any water within the device, shake it. Assuming there is no problem with the Body Control Module, just slide it back into position, making sure it is securely fastened to its mounting bracket; Ensure that all three connections on the wire harness are clean and free of corrosion by visually inspecting the contacts in each connector.
- It is impossible to predict anything in advance!
- Continue to let the central connector dangling down.
- This is not the connector on the BCM, but rather the connector at the end of the wiring harness.
- (1,200 ohms) (about A wiring problem indicates that you have a wiring problem, and you will want a wiring diagram for your car in order to repair it.
- The wiring schematic may be viewed in its entirety by selecting ‘View Image’ from the context menu.
How to Disable a GM PassLock System
Images of luxury cars and miniature toy cars provided by alma sacra on Fotolia.com. The first generation of the General Motors PassLock anti-theft technology was released in the mid-1990s. It keeps the automobile from starting if the wrong ignition key is used to start it. When your car stalls and the theft system light appears on the dashboard, there is a possibility that the PassLock system will malfunction.
The car will not start, and the PassLock system will have to be disabled and reset before the vehicle can be started again. Fortunately, this is a straightforward repair.
Step 1
Leaving the ignition key in the ‘On’ position after the car has stalled and is unable to be restarted is recommended.
Step 2
Look on the dashboard for the theft system light, which should be visible. It will be flashing on and off at random intervals. Hold the light on for 10 to 15 minutes until the flashing stops and the light remains on.
Step 3
The theft system light should be visible on the dashboard. It will be flashing on and off at various intervals throughout. You should wait 10 to 15 minutes until the light no longer blinks but continues to illuminate.
More Articles
Passlock is an immobilizer that was first used in several General Motors vehicles in the mid-to-late 1990s. In the definition of an immobilizer, it is ‘an electronic security device installed in a vehicle that prevents the engine from starting unless the right key (or token) is present.’ Passlock, on the other hand, should be dubbed the ‘Great Immobilizer’ since it not only prevents criminals from entering with no keys, but it also prevents owners from entering with the correct keys. Passlock makes use of a coded lock cylinder that, in essence, prevents the engine from starting until the appropriate key is identified by the system.
Passlock Light On Preventing Engine to Start∞
- For the most part, this means that there is an issue with the sensor. Some have speculated that the pins in the system are ‘tin’ coated and will oxidize as a result of exposure to air over time. Others claim that their system has been seized by the devil and requires the services of an exorcism. The decision on which one is more correct will be left to you. When the sensor malfunction first manifests itself, it is often represented by the system error code B2960. In this case, the ‘security’ light will remain on, and the vehicle’s engine will either a) fail to start at all, or b) start for a brief period before shutting down.
A Temporary Fix∞
Leaving your key in the ignition in the ‘auxiliary’ position for around 10-15 minutes until the security light turns off will provide a temporary solution to the problem. After the light has gone out, you can try to restart the engine once more. Rinse, repeat, and weep some more. It is possible to get a more permanent solution by replacing the ignition lock cylinder or bypassing the sensor. Replacement of a cylinder with new sensors might cost as much as $450 when labor is included. Bypassing the sensor will violate any warranty, but as the vast majority of these vehicles are out of warranty at this time, this may not be a major worry for the majority of people.
Finally a cheap passlock fix!
The work on this was completed a couple of weeks ago. It hasn’t acted in any way, and the security system hasn’t activated at all. We enlisted the help of our tractor technician to complete the task. It was claimed that two contacts on the key switch had been burned. After cleaning them with sand paper, they were ready to use. The following was copied and pasted from another website: I’ve just finished troubleshooting my 2002 Impala’s security light problem. It took me two hours and cost me nothing.
- The passlock sensor and the ignition switch are wired together in a series configuration.
- If the current generated is outside of the acceptable range, the BCM will not acknowledge the signal and your car will not start for a period of ten minutes.
- In the majority of cases, the ignition switch contacts have been burned out, resulting in a voltage drop across the contact, causing the signal received by the BCM to be lower than normal, causing it to be out of range.
- Once the switch has been removed, remove the cover that was attached to the rear of the switch (it is clipped on, all you need is a flat head screwdriver).
- I’m sure at least one or two of them are exhausted.
- If this is the case, you can use pliers to bend them to make excellent connections.
- If the contacts are severely damaged, it may be necessary to replace the ignition switch.
I understand that dealers want to replace every component on the vehicle; but, please do not allow them to replace the passlock sensor. The passlock sensor is a hall sensor, and there is no reason to believe that the sensor will malfunction.
Video: How To Fix A GM Theft Passlock System
If you’ve ever had a General Motors automobile or truck, you’re probably familiar with the feeling of having a particular sense of pride that comes from owning a real General Motors product. There’s nothing quite like it in the world. Regardless of how proud you are of your General Motors, you undoubtedly know enough about the company’s products to recognize that, no matter how good they are, they almost always seem to have some kind of manufacturing quirk that undermines the whole ‘See the United States of America in a Chevrolet’ experience.
- These security systems were integrated into numerous of General Motors’ models, notably the N-bodies from 1997 to 2003, in order to prevent stolen vehicles from being sold.
- The situation is annoying, but it’s readily resolved when you don’t go via the formal channels.
- The quickest and least evasive method of getting around this system is to enter the key into the ignition and turn the key to ‘auxiliary’ for around 10-15 minutes, or until the light turns off completely.
- You can consider installing a toggle switch if the problem persists and you want to be able to turn off the passlock system whenever you want.
- It’s then only a matter of removing the stereo’s interface using a basic screwdriver; however, it’s crucial to remember that the radio should not be disconnected at any point throughout this method, since doing so will very certainly cause the entire project to fail.
- After removing the radio from the vehicle, press the cylinder lock back and to the side.
- For the most part, toggle switches may be purchased at any hardware or electrical store such as Radio Shack or Lowe’s.
- As soon as it’s finished, the replacement switch should be installed below the dash, directly below the keyhole.
Installing a toggle for your General Motors’ passlock may not be the most difficult task that you can complete in your garage, but it is one that will save you a world of headaches in the future when you are ready to fill up the tank and hit the road.
PERMANENTLY Disable and Remove GM Security Systems
Scouts from Utah’s Troop 980 are ecstatic when their ’92 Olds Toronado begins to come to life again. Thank you to the NEWROCKIES Full Bypass Module for making this possible!
How to FULLY bypass VATS Passkey and Passlock Security Systems in GM Cars.
Is it possible that the dreadedGM Security system has just attacked you? If you’re reading this, there’s a good probability that you’re:
- Have you been struck by the feared GM Security system? Most likely, if you’re reading this, you’re one of the following:
Relax! You’re in the right place.
Valet parking systems (VATS), Passkeys, and Passlocks — the heart of General Motors security systems – have a short lifespan and are far more successful at stopping you from DRIVING your car than they are at keeping someone from STEALING your car. Vehicles equipped with General Motors Security Systems are being destroyed across North America, and the only permanent remedy is to disable and remove them completely. This is the underlying philosophy of NEWROCKIES Inc.
How NOT to bypass a GM Security System
Thousands of people are attempting to circumvent General Motors Security Systems in the incorrect manner. They simply ignore a small portion of it (the key and lock), and as a result, they find themselves stranded in their car with the exact same problem far away from home and with no understanding of why. As well as the fact that the nearest dealer is ready to pounce on them with a 1,000-dollar invoice.
The FULL Bypass solution from NEWROCKIES Inc.
Our PRO Bypass Module, which was developed by NEWROCKIES Inc. in 2008, was created for the explicit goal of circumventing malfunctioning General Motors VATS, Passkey, and Passlock security systems IN FULL. Our company has grown to become a well-known brand in the industry, with more than 1,200 repair shops in the United States and Canada regularly installing our modules on their customers’ vehicles. We continue to sell our modules to individual car owners because they are so simple to install on your own, often in less than an hour!
Our Guarantee
It will completely eliminate your car’s no-start problem, and it is guaranteed to do so for LIFE! High-quality design and manufacture, free technical assistance, a 30-day money-back guarantee, and a LIFETIME replacement warranty on our modules are all included With no strings attached. Get Yours Right Away
Passlock Theft Problems Make Car Owners Angry
I had the unpleasant pleasure of dealing with a customer today at work who was a total fool and a chronic complaint-maker. She was experiencing a Passlock issue in her vehicle. This occurs much too frequently in the vehicle repair industry, and I’m growing more frustrated with folks who have no idea what they’re talking about attempting to tell me how to do my work! It all began off as a typical job for the most part. A car was brought in because it would not start and, according to the tow truck driver, the security light was illuminated.
- After utilizing my jump box to provide some power to the car, I discovered that there was absolutely a security issue with the vehicle.
- When the ignition cylinders in most General Motors cars fail, the security or theft light will illuminate or flash, depending on the model.
- For the most part, we mechanics are able to quickly configure the security system and start the automobile in order to get it into the shop for repairs.
- As for the’>battery, it was unable to maintain a charge, indicating that it either had a damaged cell or was just defective.
- I completed the job after my service writer sold it, so I went about my business as normal, replacing the ignition cylinder and battery, and then relearning the new theft prevention signal.
- The end of the workday was approaching, so I finished up my tasks and drove the car around to be cleaned and delivered to the customer’s location.
- When the client utilized the remote control, she claimed that her horn did not sound at all.
I explained to her that I had no reason to test the horn after completing the repairs and that I had no way of knowing whether it had previously worked or not.
Her refusal to accept my explanation had me fuming, and I was about to lose my cool!
She insisted on having one replaced and made it clear that she was not going to pay for it.
This kind of situation is perhaps the most stressful thing that can happen to a technician!
A technician would go insane if he saw something like this!
I am in no way able to read people’s minds!
We now have a consumer with an issue who will not be satisfied under any circumstances.
And, what’s worse, it might have been avoided entirely!
It is not my fault that your horn is not working. No, I didn’t break it, and I wasn’t allowed to look at it, therefore you get the poo on me! The conclusion of this tale is that you should avoid being one of those clients in your store! Leave a comment below or check out these resources.
Trouble Shooter
I’m up in Maine right now, and I’m not slinging burgers just yet! Earlier this year, I had an issue with a 2000 Chevrolet K2500, which was equipped with a 5.7L engine and automatic transmission. When the car was brought in for service, it had around 60,000 miles on it. The problem is sporadic, and the vehicle can operate normally for up to a week or longer without experiencing any problems. When the problem does manifest itself, the engine will continuously crank, start, and then shut down until the problem is resolved.
- When the problem arises, the spark, fuel pressure, wiring, and grounds are all found to be in excellent working order.
- Certain tests that are required by the diagnostic chart that I am following will not be performed by my scan tool.
- It is reasonable to think that a scope pattern would be much more precise, but I do not have one available at this moment.
- After the repair, I had to clear the code in order to allow the vehicle to start again.
- When it comes to checking the signals flowing into and out of the VTD Passlock module and the VCM, what is the best instrument to use?
- Is it right to say that the signal is delivered to the PCM through the serial data Class 2 bus line?
- I’d appreciate it if you could provide a breakdown of this system.
Maine, Sebec It is important to note that, in contrast to prior GM car theft deterrent systems (Passkey I and II), Passlock does not depend on special keys with embedded resistor pellets to function.
In normal functioning, the key rotates the ignition lock cylinder to unlock the vehicle.
Following verification of the Passlock signal’s authenticity by the BCM, the BCM sends a password to the powertrain control module (PCM).
As you rightly guessed, passlock communication between the PCM and BCM takes place through the Class 2 serial data line (CKT 1807), which is connected to the BCM.
The tamper sensor is positioned on the underside of the security sensor.
An additional layer of theft prevention is provided by a security resistor embedded into the Passlock sensor.
A Passlock code is generated by each device, and this code must be recognized by the BCM when a starting attempt is made.
You shouldn’t feel horrible about yourself because you don’t have access to a scope, Steve.
However, in order to do the necessary Passlock diagnostic checks, you will want a Tech II or comparable scanner.
For further information on the various steps in the diagnostic, consult your service information.
When the Passlock theft deterrence system is activated and the fuel decision point has been reached, the value of P1626 is stored (engine cranking).
As soon as this occurs, the system enters Tamper mode, which prevents it from starting for a period of 10 minutes.
Examine the condition of all VTD wire and connections for damage.
Poor connections between male and female connectors within harness connectors should be looked out for.
In addition, look for faulty terminal-to-wire connections.
It is also possible that the wiring has been scratched through, resulting in an intermittent short as the bare spot comes into contact with other cables or sections of the car. Obtain a PDF version of this document.
Tackle These Common Chevy Colorado Passlock Problems
Symbol for the Chevrolet Security Light Unfortunately, Chevy Colorado passlock issues might leave you stuck in the middle of nowhere with no way to start your vehicle. When the car fails to identify the key, it enters a false lockout mode, which causes the vehicle to break down and crash. As a result, your vehicle perceives you as if you were an auto theft victim. This lock down mode disables the gasoline pump, resulting in a situation in which the engine turns over but does not start. A similar incident occurred on the Chevrolet Malibu a number of years ago.
- Nonetheless, the method is time-consuming and uncomfortable at the very least.
- Before we proceed with our discussion of the Chevy Colorado security system problem, let us first explain the reset method.
- Chevrolet included a function that allows drivers to circumvent the factory-installed anti-theft system, but they couldn’t make it too simple because doing so would result in a large number of stolen trucks.
- However, it may just be enough to get you moving and avoid having to pay a tow cost.
- After that, we switch off the key for 30 seconds.
- When you switch it back on this time, you should be able to crank the engine and it should start.
- The security system is re-armed when the door locks are activated.
- The Chevrolet Colorado Passlock reset has been updated.
- They had to live with the situation for several months before they were able to come up with the finances to permanently remedy it.
- The video may be viewed by clicking here.
Chevy Colorado Diagnosis and Repair
This is the part in which I generally speak about the need of thoroughly examining each individual component to ensure a valid diagnosis can be made. However, in the instance of these Chevrolet Colorado troubles, I have not observed any variation in the failed components. This means that so far, the problem has always been a faulty key reader, which may be found near the end of the ignition lock cylinder. The lighting of the security light displaying the locked padlock symbol, which indicates that this reader has failed, is a telling warning indication.
After examining the situation with a few dealership professionals, it was decided that the lock cylinder should be replaced immediately.
Because of the high failure rate of the plastic key reader, these people have specialist diagnostic equipment at their disposal, which they seldom utilize because of the high failure rate of the plastic key reader.
Replacing the Chevy Colorado Ignition Lock Cylinder
The ignition switch on a Chevy Colorado Before we get into the details of replacing the Chevy Colorado ignition lock cylinder, let’s speak about the elephant in the room. Many individuals choose to replace only the little plastic sensor that is positioned on the rear of the ignition switch rather than the entire system. Unfortunately, they do not offer this part individually at this moment, hence it is included with the lock cylinder housing as a whole. At first sight, it doesn’t appear that there is a compelling need to change the housing, as it is constructed of aluminum and appears to be rather durable.
- I understand that it is much simpler to simply replace the small plastic key reading sensor at the end of the cable, but I would rather take the time to perform the job properly.
- Due to the limited access space, if you want to just replace the key reader, you will most likely require an offset or 90 degree slanted Phillips head screwdriver.
- Remove the steering wheel as well to gain access to the nuts and screws that hold the ignition housing in place.
- Those who have previous experience disassembling a steering column from a vehicle of a different year, make, and model should find this work to be a breeze.
- An instructional video series on how to replace the Chevrolet Colorado ignition lock cylinder assembly is provided below.
Fixing Chevy Colorado Passlock Problems
Look around the Internet and you’ll come across folks who have devised inventive ways to get past the Chevrolet Colorado’s passkey security system. I would argue that this is not the best course of action to take. Take, for example, the yellow and black wires, which people like to join together to bypass the key reader in the ignition switch, which I’ll explain later. Putting the yellow and black wires together will ensure that the engine will start every time you insert the key and spin the key to the crank position.
It is possible that you are not concerned with the vehicle’s resale value at this time; but, this will be an issue when it comes time to sell the truck.
In particular, the check engine light, and now we can add the security light to the list of indicators.
Aside from the possibility of donating your car to Goodwill or another charity organization, it will almost certainly be less expensive to simply correct the Chevy ColoradoPass lock problem once and for all.
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Amazon.com: APDTY 035812 & 035813 Ignition Lock Cylinder & Starter Switch Housing Combo Kit (Includes 2 New Cut Keys; Fixes Security Light Passlock Problem; Replaces D1493F, D1432D, 22670487, 15822350, 25832354) : Automotive
Reviewer in the United States on July 9, 2014Verified Purchaser in the United States Pontiac Grand Am SE1 with a 2.4L engine from 2001. When you turned the key in the ignition, the automobile would start for a split second and then stop. The SECURITY light never flashes; it just remains on at all times. When I was driving, the light never came on. It would run for weeks without a hitch, then turn the key and nothing happened. It would always happen at the most inconvenient of times. The notorious PassLock is a security feature that prevents a user from entering a password.
Everything checked out OK, including the ignition module and fuel pressure, which were both normal.
After doing some research, I discovered that the same thing selling locally was approximately twice the price of what was selling here, and that it was more often than not similar to what was selling here.
Let’s get this thing started.
When I was having problems with the programming, I phoned the vendor (whose phone was answered promptly) and was told that I should make sure that the ground at the battery was disconnected (which I had already done).
He also stated that the procedure can take several hours in certain cases, and that he has done a lot of them before.
So, starting tomorrow, I’ll follow his instructions and, hopefully, be back up and running.
I really like my Grand Am.
YMMV I wish the keys that came with the cylinder were branded with the Pontiac logo rather than the Chevy one.
verified purchaseReviewed on September 27th, 2014 in the United States of America In a 2001 Chevrolet Malibu, I had to replace the ignition system.
This item is a direct replacement for the GM ignition cylinder and switch, and it successfully corrected the electrical problem.
The pad-printed wording on the dash trim bezel with the key position labeling was a little smudged on mine, which was a little disappointing.
To open the doors and trunk, you’ll need to maintain your original keys on hand.
Thanks for reading!
Before purchasing a new ignition cylinder and switch to resolve electrical difficulties, make sure that all other possible problem sources have been eliminated.
The first was an OEM unit completed by a dealership in 2003 to correct a passlock problem for a total cost of almost $400 in components and labor.
Purchased in the United States on May 21, 2019 and reviewed on May 22, 2019 My first attempt was successful, although it was not without difficulties, particularly while trying to follow the directions, which were not quite clear.
The instructions should state that the doors should not be opened.
My current setup is that I use the old key to open the doors as well as the glove compartment and trunk, while the new key is used just for the ignition.
I’m not sure how the new ignition component works with the BCM, or with the many alarm systems installed throughout the vehicle, or with the OnStar system.
According to the United States government, on January 1, 2017, Purchase that has been verified This was purchased since it was less expensive than going to an auto dealer.
Now, the automobile will occasionally start, but more often than not, it will not start or even crank.
Both the battery and the starter are brand new.
Some individuals had success with it, but it did not work for me.
Okay, so I’m an entry-level automotive technician at this point.
I experienced an issue with my turn signals, which progressed to the point where the car would not start.
I had to replace the danger light button numerous times to get it to work.
When the security light comes on, it causes the turn signals to ‘buzz,’ which allows me to quickly pull out my ignition cylinder.
My turn signals now function, and I no longer have to deal with the frustration of my car not starting.
Don’t make assumptions; instead, diagnose.
UPDATE 9/17/14: This switch is still functioning properly, however my vehicle has been added to the recall list for the ignition switch.
On November 6, 2016, a review was published in the United States.
After completing a self-installation that was made possible by the excellent instructions that came with the device when I purchased it.
Highly recommended if you want to fix problems with your ignition yourself or if you want to save money on the technician ripping you off by raising the cost of the part in order to earn more money on the job.
On July 3, 2021, a review was published in the United States of America. Excellent Product, Beautifully Constructed, and Excellent Value