I know our trucks are stupidly easy to break into (which is why I disconnected my rock rods), but I was always under the impression that as far as starting it up and stealing it, they were pretty secure with PASSLock II. How hard is it to defeat it? I know if you have a cut key, PASSLock II doesnt know the difference... but what about otherwise? Has anyone had their truck stolen (not broken into), like actually started up and driven away by simply beating up the ignition cylinder and such???

--Ben

You would either need to swap out the PCM for a PCM that has passlock disabled in the software or have a device that could communicate via data to fool the 'computers' into thinking everything is authenticated. Not sure how realistic the 2nd option is.

alright so basically, with 9 out of 10 theifs, they might get into my truck, but theyre not going anywhere with it...right? Im not worried because I live in a really rural area and I dont ever travel to places where its a problem, but Im just curious...

There are very few that would know how to steal it. If I were going to steal your truck I would hook up to it with a tow truck :D

I would just grab my chain and pull it home with me ;)

:lol: How would you drive a tow truck with a paper bag on your head?

I would just grab my chain and pull it home with me ;)

your truck isnt powerful enough to do that.












































:D

:lol: How would you drive a tow truck with a paper bag on your head?

well, he does have two eye holes.

Jim

There actually is a way to defeat the passlock 2 with a couple of relays, I will see if I can find it.

The first passlocks only took an inline resistor to beat

please do not post facts on stealing our trucks....use the PM ....jmo-

ahhh yes...please dont post it...

I mean you can also always buy one of those remote starter modules and install it, but basically the point is, someone would not be able to break into our trucks and have it fired up and be gone in 5-10 minutes (like with some trucks...FORD!! They dont use any security). Most theives dont even hang around that long if they cant get it started...

--Ben

There actually is a way to defeat the passlock 2 with a couple of relays, I will see if I can find it.

The first passlocks only took an inline resistor to beat

You can only defeat it if you know the proper resistance to begin with. If you don't get it right the first time, which you won't, then you are shut down for 30 mins.

The first passlock you are referring to was actually called passkey, again you need to know the actual resistance. You can't just guess at it. If you had the key you could measure it with an ohm meter. That's not the case with the passlock II.

ahhh yes...please dont post it...

I mean you can also always buy one of those remote starter modules and install it, but basically the point is, someone would not be able to break into our trucks and have it fired up and be gone in 5-10 minutes (like with some trucks...FORD!! They dont use any security). Most theives dont even hang around that long if they cant get it started...

--Ben

The remote start bypasses won't do the trick either. You need an original key to program them. They don't just 'plug and play'. Do you really think it would be that simple? ;)

The remote start bypasses won't do the trick either. You need an original key to program them. They don't just 'plug and play'. Do you really think it would be that simple? ;)

GOOD! I like to hear that. The GMT-900s have PASSLock 3, bet that will be even harder to beat... Some car manufacturers go crazy...my moms car (LS430) has the system where you keep the keyfob in your pocket and then just press a button to start the car. I wonder if anyone can even come close to stealing a car with a system like that?? All that technology is pretty cool

--Ben

Here's an interesting note... (not sure of what use it is, unless you have 2 GM trucks like me... (and maybe one of you smarter than me guys can explain the real reason why this is... my explanation is only a theory based on the fact that i don't know Jack about how it really works...)

the ignition seems to read only one side of the key...not both... while the door lock - matches both sides of the key in order for it to work....

Why do i say such a goofball thing?? I tried an old trick from the days when i couldn't afford real wheels and I owned multiple Honda rice burners.... I had the hardware store cut one side of a key using the key for my wife's 04 Chevy Tahoe, and the other side using the key for my 05 GMC Dmax.

Face the key one way in my ignition - and it starts my truck. Turn it over and put it in her truck, and it starts her truck. It won't open the doors on EITHER of our trucks.

I use it with a quick release as an idling key for cold weather, and when i want to move her car in the driveway - since it's one less key to carry...

please do not post facts on stealing our trucks....use the PM ....jmo-

yeah what he said

please do not post facts on stealing our trucks....use the PM ....jmo-

Don't worry, there is nothing in any of our posts that would allow anyone to steal a truck. My posts are just generalizations that anyone with a service manual could figure out in 2 minutes.

GOOD! I like to hear that. The GMT-900s have PASSLock 3, bet that will be even harder to beat... Some car manufacturers go crazy...my moms car (LS430) has the system where you keep the keyfob in your pocket and then just press a button to start the car. I wonder if anyone can even come close to stealing a car with a system like that?? All that technology is pretty cool

--Ben

Yep I could steal it just as easily, with a tow truck ;)

The only reasom Passlock 3 is more secure is because you can't copy a key and steal the truck.

I wouldnt post it to "steal our trucks". I only know of it because some customers would think it outragous for a $60 module and another $50 to put it in. It would only work in a remote start situation anyway, unless the thief had a good 30min to kill locating and probing wires.

With passkey I think there were only 4 resistances, so you could have a 25% shot at it;)

Max is right though you still need to know the resistance, its just a cheaper way to bypass it

I would never install a relay/resistor bypass to any of my customers for a passlock bypass. The resistance that the Hall effect sensor provides to the PCM/BCM changes over time and the computer is always learning that new value. The fixed value will not change to compensate for this. Also resistance values can vary depending on temperature so when it gets cold it might not work.

This is the reason that I am most other experienced installers always recommend data bypasses for passlock II.

You can not bypass passlock II with a couple relays and a resistor to steal a vehicle unless you have a key in the first place to measure that resistance. Your truck is not vulnerable with this method because if a thief took the time to do this he would also need a key in the first place so why wouldn't he just copy the key?


You are misinformed on the passkey system. There are exactly 15 different resistors used in passkey, not 4.

Oh I am not reccomending it to anyone, Just saying it can be done and it was posted on Directechs.com for us to use when a salesman would sell the setup without the bypass(newbies mostly) and the customer REFUSED to pay the extra charges after.

In every VATS system I have done its always been one of 4 resistances, it is just be a fluke though I suppose. Its been about 30 older devilles mostly.

You definately do see some more then others. I had orignally bought a package of 15 resistors for passkey YEARS ago and I have used at least one of each of the 15 resistors.

Thats why I had just assumed their were 4, Maybe GM knows no one steals cars around here):h

Yep I could steal it just as easily, with a tow truck ;)

The only reasom Passlock 3 is more secure is because you can't copy a key and steal the truck.

Sure it's not PassKey 3? My mother's olds has PK3, which is a standard key with a transponder in it, which must be programmed into the computer before it will start the car.

I'm not sure if it is PK3 or if GM designed a Passlock 3. I've heard conflicting reports and I honestly don't know. I wouldn't be surprised if it was a PK3+ system like in the G6's. I hope they stay with Passlock 2 but we'll see.

Hey all,

I just had my Dmax stolen on Christmas. Popped the drivers cylinder out and got in. Smashed the steering columm, off they go. I watched the whole thing on video the next morning. I was in a Holiday Inn in Mesa. My rig was parked in an extremely well lit lot with a 44ft race trailer on it. Took everything. The security camera was pointed at the truck. They even warmed the truck up for 5 minutes before they took off! You gotta have a big sack to do that.

did you get it back. i would hate to have my truck stolen

Yeah, I did but they trashed the inside. I had my edge attitude on the dash and they tried to disconnect it but for whatever reason didn't take it.:ro) Truck is at the dealer to fix columm and dent in cab, broken back glass. They took a very sharp turn with the trailer. I have a short bed. A big no no.

So I guess there is a way around the passlock, thats great -:t

And of course only the criminals know about it -:t

Hey all,

I just had my Dmax stolen on Christmas. Popped the drivers cylinder out and got in. Smashed the steering columm, off they go. I watched the whole thing on video the next morning. I was in a Holiday Inn in Mesa. My rig was parked in an extremely well lit lot with a 44ft race trailer on it. Took everything. The security camera was pointed at the truck. They even warmed the truck up for 5 minutes before they took off! You gotta have a big sack to do that.

Max Power how is that possible with Passlock II? Could they have just smashed everything so much that the PCM thought it was reading the correct hall effect key cut??

I do remember something in an article about the new GMT-900's mentioning PassLOCK 3, Im almost 99% sure it was not Passkey 3

--Ben

Max Power how is that possible with Passlock II? Could they have just smashed everything so much that the PCM thought it was reading the correct hall effect key cut??

Think what a Tech II and tools like EFI live is capable of and you can figure it out from there. Not something most crooks are capable of. There is likely more to this story then we know about because I've talked to some very knowledgeable people on the subject and it's a very uncommon thing to have a pass lock II driven away without the key.

hmmm...true