I have a dd15 cascadia 564k miles. I have a scan gauge it will go blank and the spedometer tachometer drop a bit then it powers right back up. Normal gauge drops 10 15 mph. I have changed master power switch, ignition switch, pndb, starter. All battery nuts are tight.
It will do this on flat ground or going up a hill. No codes. Head lights stay on. It dies it a couple of times in 4 to 8 hours. Today it did it twice back to back. 15 seconds apart. I thought that was it. Then it ran good for another hour until I'm parked.
Is it the cpc 4 module?