Would a piggyback Edge programmer cause problems with a EFi Live during a re-flash. Problems like communication between EFI live and the ECM. I tried to re-flash a 2007 LMM Duramax Diesel for speedo purposes only but I never knew there was a EDGE programmer installed/hidden in center console!!! I got an Error Message-calibration missing and/or damaged. My V2 also asked for another Vin License. Tried it a couple of times but kept getting error messages! Owner later told me, since it was a piggy back system he thought it wouldn't interfere so he didn't tell me.....
The truck starts and runs fine though...