Insignia 2019 2.0l diesel P226B fault code

[Msu190]

Hi all

I have a 2019 insignia 2.0l diesel, with fault code P226B. Been pressure tested and has no leaks, map sensor and egr been cleaned all good. Does anyone have any ideas what it could be? 
It was serviced on Thursday ran fine all day then Friday went into reduced power with engine management light on. Cleared the code and again went into limp mode when hitting 3000 revs, at a loss now as to what is causing it. 
Any ideas would be welcome at this point

 

[Msu190]

Just incase anyone else has this issue, the veins were blocked in the turbo, half a tin of mr muscle oven cleaner and 20 mins later running fine. 
I have now got ‘ service Adblue system’ on dash but it’s not the first time and according to Vauxhall it will disappear by itself eventually! It did last time so fingers crossed it will this time.