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My 2017 diesel goes into preheat mode no matter the outside temps.It used to do this below 40 degrees f. Now I have to used the button start twice to get her going,if I don't she will start after a few moments..Any answers? Batteries are 2 years old.
We( LI,NY) had a couple of days sub 20f degree days and the DEF service light came on after the truck was sitting during that time. Weather got up to 40d and I cleared the code, never came back. ( I got other issues with abs module but that's another subject)..as for the heater in the DEF tank...