Passlock security system

If you’re adding a new key to the system, you MUST have all IF you have a PassKEY system, click here to see the reset procedure. I have a base mo Passlock Module Replacement: In some cases, if the Passlock module itself is the culprit, it may need to be replaced. Jul 27, 2020 · Use this method to bypass a failing passlock 2 chip in an older - late 90s to 2006 ish GM vehicle, among others. Its just PassLock. 7. Attempt to start the engine, and then release the key to the “ON” position. How to perform a PassLock Reset. Quick rundown of the procedure to bypass a passlock key system. Once the padlock goes out (takes about ten minutes), try and start your Silverado. Feb 7, 2014 · The Untold Story Behind GM Security Systems. com/c/Joshyodenn🔵[SOCIAL MEDIA] 🔵 =https://www. A mechanic can perform this replacement with a genuine GM part. Oct 29, 2021 · Replacing a damaged factory (pass lock Ignition Key Switch Lock Cylinder) which had caused the battery to draw replacing it with a (non-pass lock aftermarket Jan 13, 2013 · 1999 suburban starting problem. youtube. 4. Dec 25, 2023 · Chevrolet s10 zr2 blazer passlock ii bypassTruck wont start. 2) Clear all EVO/passlock™ module and VCM/PCM DTCs. Was that because (more than) ten minutes had elapsed? Nov 29, 2011 · The Passlock(TM) controller also interfaces with the driver displays subsystem to indicate, via a security telltale, the Passlock(TM) subsystem status and acute subsystem failures. 2002 Pontiac Grand Am 129,000 mi, Visitor. If starting is attempted without authorization from the Passlock™ System, the powertrain control module (PCM) will Mar 20, 2012 · SOURCE: gm passlock security system how to disable. The passlock sensor is located inside the steering column on the right side. You can bypass the 2002 models using resisters from radio shack , there'ss a post showing how (somewhere on astrosafari. His phone number is (732) 690 6443. Also the '98 had a TSB for the Passlock IIRC. It’s not clear today whether those systems Aug 25, 2012 · Hummer H3 - How to turn off the GM Passlock anti-theft system on a Hummer H3? - Almost everyday the security light flashes and the engine on my H3 starts and dies, after I wait ten minutes the engine starts. Relearn Procedure. Step 01: Insert your key into the ignition switch and then turn your key to the ON position. Truck does not want to start and I can tell it is fuel deprived. The security system was created to prevent people from making copies of keys. The passlock relearn module, positioned in the passenger’s side footwall, is responsible for controlling the anti-theft system. Once the PASSLOCK is activated, the vehicle wil not start for 10 minutes. May 27, 2013 · 319 posts · Joined 2011. Apr 24, 2022 · Autoprof. com/C Feb 20, 2024 · Step 1 – Locate the Passlock Sensor and Control Module. Replacing the key cylinder fixes the problem. 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 the key to OFF and wait 10 seconds. Step 4: Attempt to start the vehicle and it should fire up. 3. To reset the passlock system in your vehicle, follow these steps: a) Turn the ignition key to the “ON” position and leave it there for about 10 minutes, until the security light stops flashing. Passlock – coded lock cylinder 3. 1. Jan 17, 2021 · Here is a simple procedure for bypassing the passlock 2 security system in our trucks. In any case continue on. It should just keep cranking, but a site visitor said their truck wouldn't crank either. Most '98 Chevy trucks came equipped with a General Motors passlock security feature that cuts the fuel supply to the engine if a key that's incompatible with the system is inserted into the ignition. com FREE DELIVERY possible on eligible purchases Nov 9, 2010 · This will disable the factory ignition security! I recommend getting an aftermarket security system to help protect your truck in case of attempted theft. This sensor contains two hall effect sensors, the tamper sensor on top and the security sensor under it. The ONLY part of the vehicle deactivated with the Passlock II system in a security situation is the fuel pump. It’s not uncommon to have a glitch in the theft passlock system that Jan 20, 2018 · • Security indicator on the instrument cluster • Powertrain control module (PCM) How the GM Passlock works. Jun 12, 2024 · Ring is the only one of our picks to offer both 24/7 monitoring and 24/7 customer service, which is available over the phone. Start the car. The GM passlock system doesn’t use a transponder key. Only when the security system is enabled, security light off, the car has starting issues. Written by Luca Lambruschini, February 7, 2014, GM Passkey, GM VATS. That is not the chronological order in which they were introduced. The key transponder information will be learned in the next start cycle. Oct 25, 2014 · The SECURITY indicator will transition from flashing to ON briefly to OFF after 10 minutes if remaining in the ignition ON position. This may take three tries at 10 minutes inte Relearn Procedure For Chevrolet Security Systems. It is possibly a PASSLOCK problem. Rinse, repeat, and cry. It helps to prevent anyone from starting the engine without using a coded key programmed to your vehicle. Make sure the battery if fully charged because this procedure may take up to 30 minutes and you cannot start the vehicle during this time. Remove the screws from the extension. There are also some common faults on these systems that can. 2. There are also some common faults on these systems that can prevent you from starting your own vehicle. Visiting my mom, her 2008 Chevy Colorado 4x4, I5, auto is having intermittent no crank, no start issues with the "security" light flashing. Left for three hours while shopping then retried on return 5pm. The new cylinder has to be "relearned". With a scan tool, clear any DTCs if needed, history DTCs will self clear after 100 ignition cycles. com/usr/pro-rebuild Here is a brief video covering the 1998 and 1999 GMC Safari and Chevy Astro Van typical Cranks, No-start symptom, securi Jul 18, 2023 · Step 2: Leave the key in the run position for 10-12 minutes. c) Repeat steps a) and b) two more times. Key on, press volume till readout says SETTINGS then scroll to the Security to toggle off by pressing reset ( watch YOUTUBE). There are no wires connected to the tumbler like the orginal pass lock. Some vehicle security systems rely on a special transponder key that communicates with a receiver near the lock cylinder. wrong, gm passlock systems 1 and 2 and vats disable the fuel injectors, I used to install remote starts on these trucks and have disabled many of these systems for shops when I was doing that, the passlock 3 sytems like you would have on yours will activate starter kill. Start the engine with the ignition key (modification switch must be in the OFF position). The PassLock system works when the lock cylinder moves a magnet Passlock system fault code B2960. Using the wrong key could prevent the engine from starting. Thus, I would like to turn of this security system. Aug 31, 2022 · Passlock™ System 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. Turn ignition on. Tape both ends of the cut wire. Wire colors in pictures may vary with vehicle. You can identify the different systems by the keys. Wait 10 minutes until it turns off. #18 · Jun 3, 2013. May 13, 2012 · 1810 Answers. This is the version that apparently has the security mechanism inside the ignition switch, not the little resistor Feb 9, 2021 · The process of resetting the theft-deterrent system on a 2014 Silverado is quite simple and should only take a few seconds of your time. The BCM (Body Control Module) provides security system sensor power and low reference for the Passlock sensor. Symptoms would include a randomly illuminating Security light in the gauge cluster, or a no start with a flashing security light. Oct 31, 2021 · Passlock security system in '01 Impala (sole owner) failing often. These security systems were incorporated into many of their models, including the ’97-03 N-bodies, to keep GM cars from being stolen. GM Vehicle Theft Deterrent (VTD) Relearn Feb 13, 2014 · In this video I'll show you how to bypass the passlock 2 system on GM model vehicles. Beware of the so called GM factory security systems or immobilizers, they hide behind many different names given by the auto industry to make them look more effective and advanced. Nov 24, 2016 · That's what I meant, the security light. Try to start your engine. It sometimes loses it. . I have read dozens of threads, but can't find the help I need. Step 02: Check if the Security Indicator light turns or not. remain in the OFF position for no less than 30 seconds. Jan 29, 2016 · 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 . If you have the idea that the passlock security system is the result of your key becoming worn, I would suggest talking to James at SuperModulation. 3) Momentarily rotate the ignition key to the three systems are: 1. If you find yourself stranded, your engine won't start, and the security light is flashing, wait ten minutes. Start the engine, the vehicle has now learned the Passlock™ Sensor Data Code and/or password. After it does, wait for around 10 minutes until this light turns off. Observe the “SECURITY” indicator light. The above constitutes almost everything I know about the Passlock II Security system on GM vehicles. GM VATS Key / Resistor Key Security Bypass - YouTube. f the theft deterrent system is NOT functioning. Normally requires to be serviced by someone knowledgeable with this system. Like. However, if yours is goofing up, you won’t think it’s so simple. b) Turn the key to the “OFF” position for about 5 seconds. Security light should turn on and stay on. Turn modification switch to the ON position (contacts open). The Security Telltale will. Turn the ignition switch to the OFF position and wait for 10 seconds . without key you need to essentially re wire the ignition and under the hood arround the computer controlls and power supply. well easiest way is to tape the old key near the ignition. May work with other styles/years. Those wires would break from the flexing of turning the tumbler. Then, open the passenger-side door and manually re-lock the vehicle using the switches on the inside of the passenger-side door. ebay. Under normal conditions, it should go out after about 5 seconds. Jul 24, 2012 · Passlock III reset procedure, reset security system on chevy, buick, oldsmobile, cadillac, pontiac, saturn, hummer. Engine starts and dies. This happens when the wrong/damaged key is used or the ignition lock cyl has been tampered with. Begin by using your original key fob to unlock your truck doors. Passlock Security Systems cut off fuel from the engine. 7L engines, refer to Powertrain On Board Diagnostic (OBD) System Check in Engine Controls - 5. With the key still in the run position wait 10 minutes and the security light should blink and then go out. The security system can also lockout a vehicle’s The 2000 Chevrolet Silverado is equipped with the General Motors Passlock theft-deterrent security system. I tried the relearn, but no go. Feb 4, 2014 · I believe it's got to do with the passlock system. May 12, 2017 · If you want to disable the security, entirely bypass it and never worry again about passkey and all its problems, there is a firm that sells a module , easily installed, cost is $190 (vs. Apr 13, 2011 · Simple way to defeat the security measures if your key or switch is bad. #2 · Apr 24, 2022 (Edited) @StreetRodAndy. Once the theft-deterrent security feature has been activated on your '98 Chevy truck, you will have to reset the passlock to start the engine. Tweet. If it doesn’t start or run and release the key to the ON position and complete the rest of the steps. Due to incorrect programming, this module can read as faulty as any copied keys. No failing parts, just an end to the madness. Turn key to the “ON” position without starting the engine. PassLock seems to have the highest failure rate. Nov 9, 2017 · The Passlock™ controller also interfaces with the driver displays subsystem to indicate, via a security telltale, the Passlock™ subsystem status and acute subsystem failures. Step One: Start the truck, leave it in the park, and run during this process. about $1000 for the dealer to work on and replace expensive parts in the passkey system). As a precaution, reconnect the main radio wire harness, and let the radio hang to the right side. The second way to disable the GM passlock system is the Jul 22, 2009 · The average lifespan of the passlock components less than 7 years so your system will fail again unless you bypass it completely. The passlock SECURITY sensor or wiring harness have almost a 100% failure rate. This video explains the theory behind how you bypass the passlock/passkey system on older chevy vehicles. Here's a rundown of several of the OE theft-deterrent systems out there: GM Antitheft System. Dec 16, 2021 · What does Passlock do? Passlock/Vehicle Theft Deterrent (VTD) disables the fuel injectors (for~10min), stopping the vehicle from starting. My CHEVY COLORADO has a security lock for when it thinks it's being stolen I had fixed this problem by changing my alternator and not had a problem the metho About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright Jul 15, 2013 · 6. The new security code is ready to be communicated among the PASSLOCK sensor, EVO/PASSLOCK module and VCM/PCM. Remove the caps that cover the extension screws. After 10 minutes the “SECURITY” indicator light will turn off. The directions are the same for either system (Passlock has a resister in the ignition switch, Passkey has it in the key). The GM Passlock system is fairly simple, especially when compared to other makes. Passkey III – transponder ignition key The ignition key type can be used to determine what system the vehicle has and what relearn procedure is required. 7L. So it looks like PassLock only has one version, there is no 1 or 2. the SSR has passlock II system. See the internet and search for "2004 Chevrolet passlock system relearn procedure". A) Engage the key in an attempt to start the truck. (2) Alcides Manzo January 25, 2024. PassKey 1, PassKey 2, PassKey 3 and finally PassLock. Simple permanent connection no soldering or screw terminals. Vehicle Anti-Theft System (VATS), Passkey, & Passkey II – resistive chip ignition key 2. Use the radio to do this. After I try and start it, the security light blinks twice, and then once quickly, and repeats Jun 8, 2013 · The security system on my 98 GMC K1500 will allow the engine to start, but dies immediately. Then back to the start and die scenario for a few days. Another option would be to find a local tuner and have them go into the ECM and disable the security completely. Turn key to the “OFF” position. The fix involves replacing the lock cylinder case and reprogramming the BCM and PCM. The theft deterrent system is designed to prevent vehicle theft by locking down the vehicle when the ignition or starting system is being tampered with. Wait for 10 minutes or until the security light turns off. This video is sponsored by CARDONE. Mar 14, 2023 · Leave the key in the on position. Use the following procedure after replacing the ignition cylinder or passlock module. If it starts and run, the system has reset. 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. The components of the Passlock(TM) system are as follows: The ignition switch The body control module (BCM) The security indicator on the instrument cluster Jun 25, 2019 · What goes wrong with Passlock? Passlock is a failure prone system. Security system passlock I changed steering column in my 2002 chevy Silverado and now it turns over but will not stay running! I tried some thing that said it was how to reset security system where u turn key on off wait 10 minutes u do this 3 times my truck still will not start. Once the security telltale has. I bought a bypass module from Newrockies and it actually doesn't completely bypass the PasslockII system. Sep 28, 2022 · A short picture video (less than 2 minutes) describing the basics of "Passlock", GM's rudimentary anti-theft system that is one of the most common starting i Mar 25, 2020 · The SECURITY indicator will transition from flashing to ON briefly to OFF after 10 minutes if remaining in the ignition ON position. Usually, if there is an issue with Passlock, you security light stays solid even when driving. 10 minute reboot procedure works 100%. May 15, 2023 · in this video, I cover a few different ways to diagnose and bypass the GM Passlock/VATS system as well as show the permanent solution to the problem. The flashing light should go off or illuminate without flashing. Jan 31, 2013 · One of the more common “blotches” that is annoying, but easy to patch-up, is General Motor’s anti-theft passlock security systems. Sep 15, 2010 · That is because the security system is disabled. Nov 2, 2020 · A common enough problem with older GMs is the anti-theft protection starting to fail resulting in the car no longer reliably starting or the security light a Apr 9, 2022 · 1998-1999 Chevrolet Astro, GMC Safari. The troubleshoot and reset procedures are different for each. The security light should turn on and stay on. The older one you mention had a resistor built into the key. Aug 19, 2023 · Following are the steps for relearning the GM Passlock system. This article describes how to troublshoot and fix a PassLock system. Repeat #1-#5 for four cycles or until vehicle starts. VATS, PassKey, and PassLock. No chip or transponder in the keys with Jun 24, 2017 · Turn the key to ON and attempt to start the engine. Before you start the vehicle, place ignition in RUN and observe the "SECURITY" light. Feb 16, 2011 · How To Reset Passlock and Passkey VATS System The relearn procedure for resetting the GM Passlock or Passkey security system is fairly straightforward, though it’s a little time consuming. I personally see no sense of having no security system so try the RELEARN method. Right click on it and choose "View Image" to get a full size view of the wiring diagram. To reset the passlock on a 2004 chevy colorado put the key in the on position and allow it to be on for 10 minutes until the theft sys light stays on, then you can reset the passlock with a new code. Ya imtente muchas veses y no arranca mi chevy colorado 2004. GM Doorlock, Alarm & Transponder/Passlock Interface (GMDL-BP) Data Bus Doorlock Alarm & GM Passkey/Passlock Interface: Lock/Unlock, Driver's Priority Unlock, Trunk/Hatch, OEM Security Arm/Disarm, Door trigger Output (-) & Override the 2nd /3rd generation GM Passkey3 Transponder Immobilizer & Passlock 2 Immobilizer via data bus. Luke Lambruschini. PassKey 3 is the most recent. If the Passlock system is activated, the Silverado will not be able to be started until the system is May 9, 2018 · 🔵PLEASE LIKE & SUBSCRIBE 🔵COMMENT BELOW 🔵https://www. I found that having the peace of mind of reliable starting system outweighs the disadvantages of a stalled truck! Checking the security lamp is the quickest way to determine if the antitheft system is operating properly. Try a security relearn. Security light will turn off after this. Turn the key to ON and attempt to start the engine and release the key to the ON position. The GM VTD or Passlock system uses the body control module (BCM) and ignition lock cylinder to activate the start function. -This is a VATs key, with a resistor in the body of the key. Feb 14, 2020 · Buy GM Passlock 16264955 Chevy Silverado K1500 Tahoe C1500 Truck Anti-Theft Vats Security Module REBUILT: Anti-Theft - Amazon. When it does, turn the ignition off, wait twenty seconds, and then try to start the engine. May 20, 2018 · How to Fix Passlock for Chevy Vehicles ∞. light up indicating that the Passlock System is inoperative. Yes this makes the job somewhat easier for crooks to hot wire your vehicule, but most theifs know their way around the PK2 system. May 7, 2022 · Insert the ignition key and turn it to the on position and then attempt to start the engine (crank over), the engine wont start. You’ll see the little padlock symbol, security light, or service theft deterrent system message. Last edited: Feb 16, 2024. Check Details Jan 21, 2010 · Allow the vehicle to sit with key in the ON/RUN position for no less than 11. Then it may start and run fine for a couple of days. In contrast, SimpliSafe customer service is available only from 8:00 a Sep 11, 2021 · The following is the Auto Learn Procedure: 1) Insure the ignition key is in the ON position. 0/5. Discuss your issue with him and check out if he thinks the ECM mode would be for you. So if you have a key WITHOUT a chip in it, chances are it’s a PassLock system. Jul 24, 2012 · GM made several different types of anti-theft systems. Turn the key off and wait 5 seconds. If so, there is a problem with the Passlock key antitheft system. 5509 posts · Joined 2011. How to disable and remove VATS, PASSKey and Passlock Security Systems in GM cars This site sells a part that will bypass your passlock system forever. It is common for the ignition cylinder key detection contacts to go bad. Find the Passlock sensor on the ignition lock cylinder, typically in the upper rear area. Follow the links below for information on how to troubleshoot and fix Aug 19, 2021 · In all the systems, the lock cylinder or ring antenna communicates with a dedicated anti-theft module, body control or theft deterrent module. Brake & Front End: https://www. Posted on Jan 06, 2010. SOURCE: need to bypass the passlock system on my 2001 saturn sl2. Aug 30, 2023 · Reset the passlock system. If it does not, repeat steps 1-3 up to 3 more times and it should start by the 4th attempt. Locate the Passlock control module under the dash, near the steering column. Repeat these steps for a total for 3, 10 minute cycles. Tt comes down to whether the system identifies the key or a unique identifier in the lock cylinder. I recently started having problems with mine. I do not actually show how this is done since my l May 27, 2010 · Isolate the thin yellow wire from the two others. What does this solve? Any and all no-start issues directly related to the passlock II system. passlock security issues Switch 2000 passlock system silverado ignition wire pole reset wiring clair davidSilverado security reset theft passlock system deterrent duramax gm relearn fix service procedure. Three times ten minute relearn, then started. 2 Answers. If your ignition is having trouble activating the starter the Passlock II system is not at fault (unless too many failed attempts are made in a row in some situations, see note later). Repeat steps 3-6 two more times. You may need to remove dash panels to access them. minutes. 6. This may occur everyday for a week. May 29, 2009 · These systems had a high failure rate, so GM changed to the PassLock system. Is this possible? Thanks. PassLock systems are based on the theory that car thieves will use a slide hammer to yank the lock cylinder out of the housing and then try to turn the ignition switch with needle nose pliers. It boils down to perhaps wanting to simply bypass the system and install a toggle start or something. Best way to fix is to permanently disable/disconnect passlock system. A more permanent solution is to either replace the ignition lock The Passlock II system does not disable the starter. Record and refer any VCM/PCM DTCs to: - For 5. Turn the ignition switch to the OFF position and wait for 10 seconds. #8 · May 24, 2019. Sep 28, 2019 · Turned on ignition; no attempt to start and security light flashing - Passlock in relearn mode. Turn OFF the ignition, and wait 5 seconds. If you repeat this process three times, the key should start working, and the padlock symbol should disappear. PassLock. Turn the key to ON and attempt to start the engine. instagram. Jun 15, 2011 · A pretty common issue with 2nd gen blazers is a failing or failed ignition switch, which triggers the Passlock system. Nov 11, 2022 · In the link that roorancher posted it explains 4 different systems. 5. Put the key in the ignition, and put the car back in park. The components of the Passlock™ system are as follows: • The ignition switch • The body control module (BCM) • The security indicator on the instrument cluster SecuriLock is an engine immobilization system. There are generally only minor differences in how to get the radio out to get to the wires. Security light on, Security light blinking, car starts and stalls, Passlock, how Passlock works, how to test passlock. Step 3: Turn the key off and remove it from the ignition for 45 seconds. Most people want to know the difference between passkey versus passlock. Nov 28, 2018 · The GM immobilizer systems have gone through several iterations. Mar 14, 2017 · https://www. Then disconnect the b attery for about ten minutes and then try starting the car without taking the key out. When the light shuts off you can try to start the engine again. The SECURITY light will illuminate. Tue Oct 1 2019-Attempted to start 2pm. Passkey III Reset procedure. Turn key to the “OFF” position for 5 seconds. Security light flashing. The module mimics the passkey system in signals to the computer May 23, 2019 · 454 posts · Joined 2018. April 09, 2022 07:02. Security System Upgrade: If you’re concerned about the Passlock system’s reliability, consider discussing security system upgrades or alternatives with your Turn key to the “OFF” position for 5 seconds. , failed, security light on. brakeandfrontend. In fact, owners can expect at least one failure in their ownership. You can clear the codes by disconnecting the battery for 10 minutes. But looking - Answered by a verified Chevy Mechanic We use cookies to give you the best possible experience on our website. May 30, 2011 · Is the "Security" light coming on?. GM calls these systems VAT, Passlock, Passkey, Passkey II and Passkey III. The menu to the left will guide you through the steps necessary to bypass the Passlock Security System on a 2003 Oldsmobile Alero, and keep the "SECURITY" light off forever. Please watch this video carefully there are dangers wires and some may Jul 14, 2016 · Likely PASSLOCK issue. When the light goes off, turn key to OFF position and allow the vehicle to. Check b Jan 10, 2020 · A 2200 Ohm resistor in a 2-wire Spring-Lock connector for us as PassLock Bypass kit for most GM vehicles with PassLock II. Jan 8, 2024 · The other option is to turn the PASSLOCK off. Turn the key to OFF for 10 seconds. Aug 23, 2021 · Jon Nelson discusses the GM Personalized Automobile Security System. Cut the thin yellow wire with the car running. Wiring diagrams can be found online, however i believe you can re-learn the key by leaving it inside the ignition tumblen and switch it to accesory. Oct 10, 2021 · You will find the 2002 Pontiac Security System Wiring diagram at the bottom of this article. The system disables fuel to the ignition if a valid key is not used when attempting to start the engine. and started. Turn ON the ignition, with the engine OFF. The security system is managed by the EVO/Passlock module located on the right side of the Instrument Cluster, behind the air-duct. I believe this indicates a problem with the truck's Passlock system. If you are unable to start the engine with a correctly coded key, there is a problem with the system. Under normal operation, when the key is inserted into the ignition, the ignition lock cylinder sends a signal to the theft deterrent module, or body control module, allowing the vehicle to start. com/joshyoden/🔵=https://www. Sep 27, 2020 · I found some not so great instructions on how to do this so I decided to create a quick video to show how to perform this reset on GM vehicles where there's Sep 16, 2022 · After you’ve reset the passlock security system, a security light will appear and will flash for 10 to 15 minutes. The steps necessary are similar on the other models listed above. Passlock/Vehicle Theft Deterrent (VTD) disables the fuel injectors (for~10min), stopping the vehicle from starting. Jan 30, 2020 · I am showing you how i was able to bypass the passlock 2 (i believe 2) security system in an 03 silverado. The latter is also accompanied by a 10 minute time out period where the injectors will not fire. I think it had something to do with a reflash to eliminate the Passlock from false activation. Plus, GM changed the names of the systems based on where the decoding module is located. li rr tx cm gk jq gl jc ik es