DEF Limp Mode Countdown Has Started

[red]

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?

 

[AH64ID]

It’s pure coincidence since the DPF/regen is independent of DEF/SCR.

 

[red]

Thanks. Will have to wait to see what the dealer says. My truck has the 90A recall still outstanding so they'll likely take care of this also.

 

[red]

My truck has been fixed. I'm impressed the dealer was able to get it back to me a day after I dropped it off with no appointment. It needed no parts other than what was included for the 90A recall. Seems like driving at a steady highway speed was key to getting rid of the derate message. I've attached pictures of the dealer service order.

 

[Riddick]

As stated above the Service DEF message is not associated to the DPF or regens. I am glad they were able to clear the fault and get you back on the road, hope she stays running good for you.