I think the major issue is that this will never be a problem with a “one size fits all” solution. The level of complexity these trucks have is staggering. There are multiple independent systems that all tie together when it comes to regenerating the DPF. If any one of those subsystems has an issue, the balance gets upset and things start working incorrectly. Add to this variables in each trucks daily duty cycle, as well as the type of operator the truck has, and you have a very complicated issue that requires significant amounts of time to digest, dissect, and diagnose. It’s a snowball of complexity, enlarged by lack of experienced technicians, made further larger by dealerships that are under time crunches and out of service deadlines, and what you end up with is a conundrum.