What should the boost pressure be at idle on stock 2006? I'm assuming is should be 0 psi or very low at idle with no load. I just bought the Auto Enginuity scan tool with Chrysler extension, and it says I am at around 12.5 psi (idle, no load) and about 33 psi at full throttle, full load.

I recently had to take off the Quadzilla Max Mileage Module, because I got a check engine, severe derate, and P0237 code. The truck runs perfectly after I disconnected the box, except for the boost pressure. I hooked it up with the scan tool, and I immediately throw the code, and boost pressure is 0 psi under all conditions with the M3 hooked up.

Any help is appreciated. If I need the sensor, the Cummins dealer needs a couple days to get it in, and I am leaving for vacation early next week.

 

Boost will be 0 psi at an idle but thats a reference from ambient.

What the scanners are reading is the MAP signal which is reading from sea level. Depending on your elevation that will vary from 14.7 psi down.

I'd say you have a bad Quad box from the sounds of it, or a short in the MAP connection piece.