Thank you all for comments and questions. I have a Jeep Grand Cherokee 2008 3.0 CRD with 150k km on board. Good mileage, good power, crappy interior finishing but I like and (used to) trust diesels.
As of last 6 months, I have started having various problems, some due to quality of work done at the dealership, some due to something that seems nearly intentional design towards timed demand for services.
I am an engineer and, as I learn more about the 3.0 CRD, I cannot understand how such details like the oil leak over the swirl actuator and the undesired oil vapor intake dealth with by the elephant mod could be left behind without being addressed by the manufacturer.
As they say "follow the money"
So, got the P2015 and the switch to limp mode after doing a u-turn with a reverse on a mountain road, 20 miles from the nearest highway (I live in the Canadian Rockies). I have an ODB2 tool that is now part of my auto first aid box. I tried to reset it (trick that worked once before with a P0107 - MAP sensor) but did not succeed.
Went in limp mode back home (140 miles, Canadian winter with -30 below) with an unhappy wife sitting next to me (she drives a Liberty that never gave her surprises).
Dealer confirmed the Swirl actuator failure and gave me a rough estimate of between 2000 and 4000 depending on what is found during the replacement.
I took the car home and, at my son's insistance (he drives a Jeep Wrangler 4X4 with mods) with the documentation at hand, I jumped into the repair.
I used the following links:
The whole exercise took 20-30 minutes and I used a $ 5.00 resistor pack that included the 4.7 K Ohm resistor ( I spent more as I bought also a headlamp). The fix was done yesterday and allowed me to clear the error code and to drive with what it seems full power.
I took pictures and I will follow up with mileage and other info in a week from now.
So, thank you for the info and the courage to take ownership of issues.