Mine went into limp mode at the end of August. Up until that point, I had been saying that it's the best car I've owned and was disappointed that GM had pulled the pin on this, but understandable if the general public weren't going to give a non-Aus manufacture Commodore a chance.
Anyway - the major problem here is that the local Holden service centre hasn't got a club what is wrong. They've lodged what they called a TAC case with support in Melbourne (I'm sure forum users here have heard of that) but haven't got anything back yet.
I'm gobsmacked that they cant work this out, surely if the computer knows there's an issue, the diagnostics would spit out a code and say what is wrong but they're baffled.
I did have a sensor issue back in 2019 which was easy fixed but the component wasn't in the country so we had to wait weeks for it to come from Germany. At least they gave me a vehicle in the interim but back then the brand was still alive and they were trying to stave off any disgruntled customers. This time, no such help.
I've been cool about it until now because I know the crap that people are going through in NSW and Vic at the moment, but surely someone in their team is able to answer the question after four weeks.
FYI - this is the diesel model. Apparently it's not uncommon in the Opel Insignia, it's possibly either an air leak or a crappy DPF.