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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / February 2007

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PK3 Security Key Issues

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jmoleary - 12 Feb 2007 18:28 GMT
Having learned some interesting behavior from experience, I'd like to
share with anyone interested. I wanted to install an aftermarket remote
starter on my wife's 2002 Montana. Because it uses PK3 keys, manuals
stated an additional PK3 key placed inside an additional transponder
module was required. I found a shortcut that works for me because I
don't value the PK3 key security anyway. I simply duc-taped an original
PK3 key inside the steering column, next to the ignition module. Now the
very expensive PK3 keys don't work, but cheap hardware store copies do.
Also the remote starter works fine without the additional transponder
expense.

What I learned could save someone simply wanting extra keys money on
any vehicle equipped with PK3 security keys. Just do my duc-tape trick,
and buy as many cheap hardware-store key copies as you like.

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ponchonutty - 18 Feb 2007 22:43 GMT
That ghetto-mod has been posted on here plenty of times before and it is
not recomended either.  After some time, that PK3 key that you have
tapped to the car will fail and then you will not be able to start it.
Trust me on this.  I install remote starters for a living and have seen
plenty of my competitor's vehicles come in with this ghetto-mod and
making things mess up.

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jmoleary - 20 Feb 2007 22:19 GMT
My "fix" has been in place doing exactly what I want for some time now.
I personally doubt your report of eventual failure.  The PK3 key held
close to the ignition sensor is no different than always using the same
PK3 key in the normal fashion.  If it ever fails, though the fix is to
simply re-program the PK3 key into the car's memory.  I have directions
on how to accomplish this.  

I don't mean to start an argument with you.  I am only reporting my
experience so that someone else can make their own judgement on whether
they would like to copy what I did.  I must point out that since by your
admission you are a professional installer, it would be advantageous to
your business to convince people that this simple, cheap alternative
has problems.

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ponchonutty - 21 Feb 2007 02:51 GMT
Well, I'm only reporting what I know since I've done 100's of remote
starters on vehicles with the PK3 or simular systems.  See, when these
transponder based systems first came out, the only way to bypass them
when installing a remote start was to do what you did or install the
key in a box that had an antenna that travelled up to the ignition
switch.  When the remote start would activate, it'd energize the relay
inside the box so the key's code would travel in the antenna and the
car would see the correct code.  The problem with this is that in
extreme weather conditions, the pellet inside the key would change it's
strength and in some cases, it's code just enough to make the system
fail.  This was very common on the newer Ford keys.  On GM, it'd
sometimes make the computer go nuts and drop ALL KEY CODES.  

Again, I too don't want to argue.  I'm just stating what I've actually
come across.

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