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Hi. Thanks for using JA! I will try and help you out.
So the engine will complete a stopped regen but just not a auto regen while driving correct?
I see. Thanks for the information.
I have seen this several timed before.
There are 3 things that I have seen cause this problem.
The first and most common is clogged filter fittings. These fitting are in the manifold just before the ARD head of the system. They are the fittings that the fuel lines to the ARD head connect to. When they become clogged, the system has difficulty performing a regen while driving. I always replaced these first.
Second is a low pressure fuel system problem. This is caused by a weak transfer pump, fuel enable control valve, or pressure regulator.
And thrid is a faulty ARD head. IF replacing the filter fittings does not solve the problem, I next replace the ARD head. Over time the ARD head becomes clogged and dirty and has difficulty performing a regen while driving.
Please let me know if you need more help or have more questions.