no, you can reflash. auxiliar heater have delay for minim voltage 0sec and parking have 5sec. when you turn the key to crank auxiliar wil stop with error if you start with wbus controllers
a17dtr replace egr only with original, aftermarchet you will have same problem.
clean and if you have same problem is electronic part with problem. also be carefoul because the dpf will not regenarate.