Recently my MM3 has started acting weird, and I’m hoping maybe you guys can help.

The truck seems to run fine, and all but the MM3 data is off, the rail pressure, boost, trans temp, and pretty much all the readings.

I have set up all read way low, for example, while driving down the road, and the boost fluctuates from low single digits into negative numbers.

And rail pressure reads 5-6k. It didn’t use to do this; it just recently started.

Any ideas?

Thanks!