Australian Car Repair Issues? Ask an Auto Mechanic for Answers ASAP
I work for Holden, so I'll help you here.
If the turbo ducting has a split hose it will make more noise than usual, give lower power, and set a DTc as you have described.
Start looking at all the turbo duct hoses and the rocker cover breather hose for oil leaks near.
A leak at a hose end (loose hose clamp or perishing hose) or anywhere along a hose (split).
A turbo over boost code is not a reason to replace the turbo, the code sets because the commanded boost pressure exceeds actual boost.
They are very common for hose failures.
Hope this helps.
The turbo intake hose and turbo outlet the intercooler hose are common, and you have replaced them.
How about the hose from the intercooler to the throttlebody?
The Captiva Diesel engine and wiring harness is a difficult setup to maintain, and is fraught with problem areas.
Is the aircleaner filter housing fitted correctly? If not, you'll also hear turbo compressor surge back through the intake more easily.
I would say if you can't see anything obvious, I would recommend you take the vehicle to a Holden dealer for further analysis.
I could be one of the boost solenoids leaking.
It could be a programming/config and setup issue.
It could be a stuck injector intermittent.
It could be an intermittent wiring fault.
Sorry I can't give much more.
Maybe in a few years we can have remote access to your vehicle like than can with home computers.
Then I would more of chance.
Just checking in to see if you have had any luck with your car.
Have you taken it to Holden for some further diagnosis?