Just got off the phone with a customer that has a 07' classic LBZ, he had a CEL pop up while driving so he dropped by the local dealer, took out his PPE program, and left the truck for them to look at... They called him the next day and said it was ready to go, they told him that it needed a reflash and thats all it took to make the CEL go away. So he drove it home, plugged in the PPE programer, uploaded a program, everything went fine, tried to start the truck and nothing! wont crank over. no CEL, PPE now locks up while trying to load the stock program, we forced the stock program into it with the PPE and still no luck, PPE was alot of help but they ran out of ideas. Back to the dealer, Come to find out the new reflash will lock the ECM if you try to upload a program or change anything in the ecm. The dealer cannot unlock it. They are required to send in the ECM when they run into a certain engine code and the no crank problem, if the ECM has had this flash. They put a new ECM in the truck and told him not to try and upload any programs or it will do the same thing again and they will have to charge him to replace it (they are telling GM that the computer locked up while they were trying to re-flash it). So now what??? Has anybody else heard about this new flash?? What happens if we use EFI live on a customers truck that has this flash... will we run into the same problem??