Steven I'll always treasure the GP as one of my favorite cars of all time. After all I did have 3 of them! And if it wasn't for the GP there would be no drcustomparts.....

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Bright Red 2008 G8 GT

Mods: DRCUSTOMPARTS Center Gauge Bezel
Superchips ECM/TCM Tune- Volant CAI
Custom Borla Axle Back Mufflers - HID's
Holden V8 Badges
My Website

Does anyone know if having an aftermarket headunit will affect this security relearn?

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2009.5 SBM G8 GT
November 2011 Car of the Month

So, I get in the car... Walmart parking lot...
Starting Disabled Due To Theft System!
Service Theft System!!!
Both PCMs are locked!!!
So, just started the relearn now... Guess i'll be here till about 10:00ish...
I can't remember,... can you change the relearn time in the BIN to 1 minute in the '04+ cars?
Shit, damn, kcuf...

Well,... Strange enough...
It just took the 1 step of the relearn to let me start the car...
What a PITA...
Both PCMs start the car, all is good!

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No trees were destroyed for this message.
However, a great number of pixels were extremely inconvenienced.

I believe in dragons, sane women, & other mythical creatures.

Question:

I have the "Service Theft System" light on the DIC, but it has never affected starting. How do I reset that?

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Try unplugging the negative battery cable for 5 minutes, then reconnect it. If that doesn't work your key or ignition switch might be going bad.

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Bright Red 2008 G8 GT

Mods: DRCUSTOMPARTS Center Gauge Bezel
Superchips ECM/TCM Tune- Volant CAI
Custom Borla Axle Back Mufflers - HID's
Holden V8 Badges
My Website

I'll try that, but I have a sneaking suspicion that one of the above are bad.

I only have one(very worn) key, as well as the key cylinder being finicky at times, and the little metal piece is even bent to hell.

Yay for stealerships!!!

Thanks Don.

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Just for everyone's info if they want to program a duplicate key.

From the service manual:
There are actually two procedures, but one involves using a programming tool which only dealers would have access to, so I am going to leave that one out.
30 Minute Relearn Procedure (Steps): This is for a "replacement" (new) key (no original available)
1) Insert a "Master" Passkey III (PK3) Key (the one with the black plastic cover as shown above).
2) Turn the Ignition to ON, but do NOT start the engine. You should see the "Security" message on the dash for about 10 minutes and then it will turn off.
3) Turn OFF the Ignition and wait 5 seconds.
4) Repeat the above steps (1-3) a total of 3 times, or a total of 30 minutes.
5) After the third time (including turning back to the OFF position), start the van. The van should now have "learned" the transponder information and will allow it to start and continue to run.
Important Notes:
- When the above procedure is used, all previously learned keys will be erased from system memory.
- Additional keys can be learned immediately after the relearn procedure. This is done by inserting the additional key and turning the ignition to the RUN position within 10 seconds of removing the previously learned key

From another source (that provides PK3 keys): This is used to add a "duplicate" key (have original)
1) Insert the "Original" (working) Key.
2) Turn the Ignition to ON (RUN), but do NOT start the engine. Turn the Ignition OFF and remove the key.
3) Within 15 seconds insert the new "duplicate" key and turn the Ignition to the ON position. The Security indicator should light for about 2 seconds to indicate that the new key has been programmed.
4) The new key should now be able to start and run the van.
Notes:
- The manual seems to confirm this procedure except that the new key should be inserted and turned to ON (RUN) within 10 seconds.

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2009.5 SBM G8 GT
November 2011 Car of the Month

I just installed a Overkill PCM...

I only had to do step one? The second attempt after 15mins the car just started up, lol. I was skeptical about this and turned it off and on a few times to make sure and drove around a little. It works perfectly.

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Why have more money than brains? Cuz RACE CAR

I only had to do step one when I installed the Overkill PCM so it's normal.

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Bright Red 2008 G8 GT

Mods: DRCUSTOMPARTS Center Gauge Bezel
Superchips ECM/TCM Tune- Volant CAI
Custom Borla Axle Back Mufflers - HID's
Holden V8 Badges
My Website

Can my DHP PCM work on another GP if the vin # isn't programed into it or is this irrelevant?

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Why have more money than brains? Cuz RACE CAR

I have yet to find a ZZP PCM installed in a car that has the car's VIN programmed into it...

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No trees were destroyed for this message.
However, a great number of pixels were extremely inconvenienced.

I believe in dragons, sane women, & other mythical creatures.

I have a back up PCM that I want to put in but it already has the VIN programmed into it. Will I have to do the relearn still?

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sport red-05 COMP.G. MOD here MOD there.

Yes sir

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Why have more money than brains? Cuz RACE CAR

If the PCM has never been in the car you'll have to do a relearn. Once it has you can swap them back & forth without a relearn.

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Bright Red 2008 G8 GT

Mods: DRCUSTOMPARTS Center Gauge Bezel
Superchips ECM/TCM Tune- Volant CAI
Custom Borla Axle Back Mufflers - HID's
Holden V8 Badges
My Website