Webdec 31, 2021 · 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.
Webjul 23, 2022 · service def see dealer code appeared on my dash.
I very easily cleaned injector (it was dirty) and error code self cleared.
It’s been two weeks and no issues.
Webjul 1, 2018 · the first message was 'service def system see dealer. ' probably ten minutes later the '125 miles until truck will be limited to 5mph' started.
Web5 days ago · a common message is “service def system see dealer,” which can indicate issues such as an overfilled def tank or dirty def fluid.
Check the def gauge regularly.