all ecm/ pcm all keep mileage,time ,dates, who reprogramed ,updated,or as stated unknown? etc. if they (manufactures) really want to know the manufactures have another programs that tech/mech don't have or know of.that keep track of rpms ,length of time, faults, parameters,etc etc with them.and more might work once but not to many times.this is going on awhile now. don"t blame the diesel truck guys.blame the guy who post video of racing his or her car .go to local event. then show up on monday saying their car is broke.when somebody from the dealership saw them or bragging @ party, posting video online .they (manufactures) log all kinds of information.during testing.so you are not going to pull one over on them.just now they have to cut cost.