A long shot, but as it is 2008, try reading + clearing under EOBD.
You could try a post on IATN, but not sure how familiar they are over the pond with diesels
What tool are you using ? are you using Chrysler or MB to connect? what are fault codes ?
Cheers Aidan
Message Thread 
Chrysler 300C 3.0 V6 2008 - Swirl motor problem # - Carl Ford July 19, 2010, 10:45 am
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