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My name is ***** ***** I am a professional here at Just Answer. I noticed that your question had not received a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.If you no longer need help post a simple reply to let me know.
The DPF failing or plugging up is the main cause of this fault here with it needing removed and cleaned by a facility that can remove and clean it or removed and replaced.You will need to have it tested further to make sure this is the cause.But if the dealer did do all the right testing I suspect it does need to be replaced or removed and cleaned.
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The engine coolant temp sensor and any exhaust temp sensors at fault can cause the conditions to not be met to operate the regen.I would have these checked/tested to see if any of these are faulty needing replaced.These are sensors I have run into before on other models that will cause this fault here.
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