The pcm is the least likely cause of that code and would be a complete waste of money. You have def isssues its taking to long for your def system to prime and pressurize.
Thank you.Def codes wont effect regen
On these if the def system fails it well self test a couple times then cause a countdown to no start. But since def is unrelated to the dpf that system well stay active and functional.Thank you.
I have never owned a diesel before so it is all new stuff to me. I thought maybe with a def code, the computer will disable the system (like an airbag light will disable the whole restraint system for example)