I don't think there's any way to install just a TCM tune...you need to go through the ECM process/menu first.
You can install just an ECM tune, but that doesn't help you.

Yup, I was planning a tune either way when I take the car out of storage. But, if for some reason I go back to stock tune, I don't want the engine light on.

Ok, thanks.
I was planning to have him do a custom tune next summer once I have the exhaust done (car is away for winter). But, I may just get a catted pipe instead.
Thanks!

Hi...if I go with a ZZP catless downpipe, the check engine will come on on my 2007 Grand Prix GXP. I have an i3 8245 Platinum. Am I able to turn off the engine light with this programmer?

Obviously I mean turn it off and stay off...not come back on next sensor check.
Thanks!

The Platinum has the ability to tune multiple cars, if you purchase an extra license for each vehicle.
I just tuned my '07 Grand Prix GXP with the Platinum to the 93 Diablotune...car is MUCH more responsive and a noticeable difference in mid-range power!!!