We encountered exactly the same problem as you on one of these. The car came in with a blocked dpf to us which we think was due to a sticking egr valve. We renewed the egr valve and ended up fitting an aftermarket dpf supplied by vauxhall due to the genuine one being on back order and had been for some time. We were assured that it would be fine and that they had fitted them before with no issues. We fitted it then took it to vauxhall for a software update, there is a software update regarding the dpf regen. The customer drove the car for a few weeks with no issues then returned to us with the glow plug light flashing. Not sure exactly what was wrong but it was like the car couldn't complete the regen for some reason. We think it was unhappy with the back pressure or temperature readings from the aftermarket dpf. We put it into vauxhall and told them that the aftermarket dpf wasn't going to work.
They fitted a new genuine dpf foc which they sourced from another dealer. Hope this helps.
I'll have a look once I get to work and see if I stored any live data. I'm not sure if I did.
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