Quote Originally Posted by surferstick View Post
I was told by GM that only a "virgin" odometer can be programmed by a Tech II programmer to a set mileage. Once an odometer sees it's first BCM signals to start recording mileage, it locks out the setting mode and can no longer be reset by a Tech II. Makes sense if you think about it - an dealership could roll back mileage on every used car on the lot.

There are a couple of specialty reprogramming shops that you can google. There are a couple certified by GM (probably some government regulation too) to be able to set a specific mileage in a non - virgin odometer. They are pricey though - over $200 bucks for the programming plus shipping. I decided to use the second DIC behind the 5 button, and swap as needed.
Not according to this from GPNOA:

I finally got sick and tired of dealerships telling my the DIC can not be reprogrammed. Well I finally said screw it and went to the company that developed the software for the tech 2. It took 5 minutes for them to give me the steps. Once I handed this to the dealer I had no further issues.

Follow the procedure below to program the IPC/DIC:

Important:
If the vehicle has air conditioning, you now must turn on the air conditioning feature. - Not really needed due to the update.

IMPORTANT NOTE: You must keep the old IPC/DIC in the vehicle until prompted to replace it.

1. Select J2534 Tech 2(R).
2. Load the VIN number in TIS2WEB.
3. Highlight (SF) Special Functions and click Next.
4. Click the Next button and begin the programming process.

Programming time - 1 to 4 hours

Using the Tech 2(R)/CANDi module (only), navigate to the IPC module setup function. Perform the function as requested.

Grand Prixs Of North America • View topic - Reprogramming DIC for Odometer reading