It has come to my attention that the C6 has a 10 minute time out feature that turns the car off if left in accesory mode for more than 10 minutes.
Please keep this in mind any time you are planning to upload a tune, especially if you are going through and modifying parameters.
There are two things that you really NEVER want to do while a Predator is writing to the car:
1.Unpluging the Predator
2.Turning the car off
Either of these two errors will cause a no-start situation, requiring the PCM to be reflashed with a Tech-II.
Thanks