ECM-18B0 Swirl Actuator Control - Offset Fault
 

I wonder if anyone can help with the above fault on my 2008 XC90 D5 (185).
The fault is logged after an engine shutdown. If I clear it and drive, it's OK until shutdown.
Looking at the live data, on shutdown, when the actuator goes to the end of it's travel, it reports 654% - which clearly isn't right. (Actuator seems to move normally otherwise).

If I manually move the arm a tiny bit it jumps back to a sensible reading (under 100%).
I've just replaced the swirl actuator with a used part, and it's exactly the same (might have been a few % different before, but certainly +600 something).

I'm assuming the replacement part is also faulty, but before I take that up with the supplier, can anyone offer any suggestions?

Previously the swirl flap assembly and arm etc were replaced, and they all work correctly.

Did you ever resolve this problem?
I've got exactly the same thing happing on an XC60 with a D5244T4.