Happened to mine the other night. Cylinder 7. Currently at the dealer waiting for approval from Holden to replace all 8 but they believe they will only get approval to replace the one. They also charge a non refundable $150 diagnostic fee at my local dealer. So if I need to go through this 8 times it is going to cost me over a $1k anyway which i will find hard to stomach. I'll find out today if I get all 8 covered. Car is a 2015 VF2 Calais wagon out of warranty with only 42000km on the clock.
The dealer are asshats to charge you a diagnostics fee when they are fully aware of the defect. But even if they do charge a diagnostics fee, it must be refunded as Holden must carry the cost of this known defect under ACL.
Ask the dealer clearly when they’ll refund you the diagnostics fee you’ve paid and if they say they don’t refund (which I doubt), get on to HCC involved. I’m sure HCC will sort it out for you (and I’d be pushing for some freebei for the inconvenience of being stuffed around).
As a side note, in the US, if there is a recall, the recall notice goes as far as outlining how one can claim out of pocket costs spent on having this recall issue rectified or attempted to have it rectified, even if the costs were spent via 3rd party mechanics... such is not documented down under ACL follows the same principles. It’s just a little more stuffing about as Holden hasn’t define such processes down under like what GM has done in the US.