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My 2019 3500 was giving me egr problems at 60,000km. Couldn't get the parts for a week so couple times a day it would go to limp mode and all I did was hook up my phone app and clear the codes and continue driving
Was getting the p0299 code but running good. Got the update done (because it was cold and the remote start doesn't work with the check engine light on) and a week later was getting a whole bunch more codes and limp mode. Brought it back and they found that the EGR valve was no good. Changed it...