I've used EFI Live off and on for the past two years with two duramax engines in engine test cells and recently tried it for the first on a 2003 stock Z06. Is it normal for the car to flash the yellow hazzard lights and give messages on the dash of reduced power mode, lost traction control etc. while the ECU is being reflashed?

The reflash seems successful and I was able to disable the CARS/CAGS skip shift feature but I was a little nervous about what was happening while reflashing the ECU.

Since my previous experience has only been with engines in a test cell this was fairly new to me doing one in an actual vehicle.