[Keep on Rollin]

We've seen that 147-7 code as well as 147-12 a couple of times. I was told by DD shops that on EGR engines they see a lot of trouble with the VPOD's (Variable Pressure Output Devices). DD is now on revision 10 or so. Sometimes they work for years, however they also see them fail just after replacement.
In our case the turbo VPOD was replaced twice and the EGR VPOD ones. The VPOD is the device that controls the EGR valve or the turbo vanes.