I'm not up on how vauxhall work theirs, if it's passive it'll need removing and either cleaning or changing.
If it's active you will need the error code clearing and a regen forced.
My e90 330d came up with the dpf error and ran likes turd, so i took it for a drive till warning came up, killed ignition for 10 then ragged it for a bit till warning came up again. Repeated process and been spot on since. It was very blocked and felt like it had lost 2/3 of its power, that said i know the dpf had only been replaced 8k ago before the issues, so might have had more chance than yours maybe.
Remove and coding out was on the cards though otherwise.