Driving on the highway yesterday, not towing, I noticed on the Evic that an automatic regen had started. About 5 minutes into this regen, the Service DEF See Dealer message appeared on the evic. After a few seconds, this went away with the Automatic Regen message reappearing. Eventually the regen finished and everything seemed normal, however, every restart yesterday had the Service DEF System reappearing for a few seconds on the evic but no CEL. Today the message indicated the dreaded countdown to limp mode had begun but still no CEL. The truck is a 2020 3500 with 46000km on the clock. It's currently sitting at the dealer waiting for them to check it out. Is it pure coincidence the message first appeared during a regen or is it related?