UNKNOWN ERROR

[markschooley]

I just got my Predator today and after thoroughly reading the manual decided to try to install a tune.
Everything worked just like the manual said, backed up the factory stock tune without a hitch (seemed to take about 3 minutes or so).
Went to install the 87 Octane tune and after a few moments of the device communicating with my truck, it showed "Writing Data" on the screen.
Then it immediately displayed "Unknown Error" followed by "Script Error" and would not continue.
Turned the key off and disconnected the Predator and the truck started and ran fine (phew!).

Tried the whole process from scratch twice again with same results.

I have a 2007 Silverado Classic, 2500HD, Auto, 4x4, I do not have onstar.
I am using a Model U7192 Predator, Bios 6.01. It displays "GM Predator 2.05" on the screen after I plug it in to my truck.

What could the problem be?

[mikel]

Is there any aftermarket devices in the truck that may be drawing voltage when cycling the key?
Remote starter, trailer brake, GPS system, stereo, amps, etc...if so, disable them and try again.
Be sure the battery is fully charged as well.

Thanks

[markschooley]

Looks like I wasn't turning the key far enough. I was only turning it to "ACC" and not "ON".
Tried it again with the ignition "ON" and it worked. Thank you for the answer.