Hey guys, just wanted to give you guys a heads up. I'm tuning my 2010 sierra with e38 ecm. I used the bluecat 5.0 tool to try correcting an issue I was seeing using the built in vve tool in 3.0. Some of the values bluecat generated apparently corrupted the Cal file in my ecm. It knocks out the communication protocol, rendering the ecm useless, even when trying to use gm programming and recovery methods. No scan tool or programming protocol will communicate with the ecm. It first seemed to be a vehicle battery issue. Second issue seemed to be an hpt cable issue. Third time was no question the vve equations. Having said that, the prior two flashes that ruined my ecms both happened after a flash using bluecat vve calculated coefficients.