How to reset DEF message on a Dodge Ram (2016) with a Cummins Diesel Engine. The Service DEF System Message or P202e Code is a genuine game stopper and will put you in limp mode, but it doesn't NEED to be. I show you how I reset the DEF Limp mode code on my 2016 Dodge Cummins Diesel Engine to get home.
This may not FIX your problem... It is probably the DEF Injector that is giving you grief... BUT, it should get you home and to the repair shop WITHOUT a tow truck.
Good Luck, and as always, it didn't harm my truck but you are an adult now and need to take responsibility for your own decisions if you do this too.
-Shane