The term "Death FLASH" that I remember referred to a SPARK KNOCK issue. Chrysler came out with a computer update (a flash) that retarded timing. Killed performance and hurt fuel mpg. This was on trucks back in 1997 tihrough 2002 or so. It was done to 1000s of trucks. Unhooking the battery for 30 seconds is not a FLASH. It just allows parameters to be 0 out. So they have to reset on start up and driving. Like turning your computer OFF it then has to reload the progams on startup.On the tiire sensor,you can also let air out,put air back in and see if it resets. Dealer has a tool to reset them also. Maybe some higher end tire stores may have.