I bought it based on misread literature. It is not vin locked and powers up nicely. I just can't use it on my 03 since it is a 2002 model.
It is for GM Vehicles with 4.3/4.8/5.3/6.0/8.1L VORTEC Engines.

http://greensboro.craigslist.org/pts/4251864117.html