I havent noticed the dash check engine light come on but there were a couple of codes that showed on the ScanGauge.
119 hydraulic pressure retarder and 55 shift finger status
I think those are being caused by the shutoff though not causing it.
My buddy (a big rig tech) recommended changing the ignition switch so I'm going to change it as maybe something is cutting it off for a second.
However after researching last night - I may just be a newb owner as I suspect it could be the LOW COOLANT - STOP ENGINE event.
My rig doesnt have the dash light for the low coolant. Its there (printed on the wire) but no light for it.
Anyway I checked the coolant and it was just above the MIN level which is just above the sensor. I added 1.5 gallons of anti-freeze
to get it to the MAX line. Luckily the previous owners left a gallon in a bay so I knew what to use.
It always seemed to occur when I would lift off the gas and was coasting downhill. They were also fairly rough roads in 2 of the events.
It sure is a pain to get the cap off and fill but I'm praying this fixes it!!!
I'm also going to change the oil pressure sending unit - in case that triggered the event.