I've seen numerous posts asking if there are problems with MPVI2 /MPVI2+ and JTEC. Some have speculated that maybe they turned off MPVI2 / MPVI2+ when they came out with MPVI3. I contacted HP Tuners today and asked them, they replied they didn't change (or turn off) anything in MVPI2 / MPVI2+. They said, if you have problems, send it to them.