Im having the same exact promblem right now and im at a loss of what to do. I replaced the CPS and the batteries. Im throwing no codes but it just turns over and wont crank, BUT somtimes if it sits a day it will crank out of the blue ?????I have a fleet of PSD trucks and vans to service and I'm getting intermittent dying on several. No codes.
Sometimes they start right back up -- other times it takes starting fluid or some other more drastic means (long crank times, leave it sit overnight, etc.).
Any suggestions outside of the CPS?
Just change the CPS anyway?