Service Def System See Dealer

Jan 16, 2022 · for example, if the tune turns off the def system, the cts3 can no longer read % def, the def command or the def tank level gauge. The tune on my 2016 1500 now turns. Dec 15, 2013 · you could try a reset by pulling your negative battery cable for at least 30 minutes to clear the code but if it comes back, go see the dealer for a fix. You have a warranty even. They both disappeared on their own but is this a precursor to the 5mph restriction?.