Hello every one.

My 850T5 has just developed a problem and I am at a bit of a loss as to how to fix it.

The symptoms are the car now accelerates like a 2.3L low compression 850 Volvo to an amusing swaney whistle type noise.
The noise rises in pitch in time with the turbo and not the revs or roadspeed. It's not the turbo spooling as I can hear the normal very high pitched whine as it does so.
I found a couple of the vacuum hoses had come off but their refitting made no difference to the lack of performance or noise.
The standard boost guage shows the boost going to the start of the white section,as it used to (the car is bog standard) but the acceleration that went with it has gone.

I can't find any leaks (it doen't make the noise on idle thus making it tricky for me to fault find).

I've got the codes that were on the ECU:

3-2-5 ECU memory loss
5-3-5 Turbo regulator valve fault

I cleared the codes.

Checked all the vacuum hoses I could find, and took her for a spin.

Still the comedy noise, boost on the guage but not much acceleration.

Stopped, checked the ECU and no fault was reported.


By reseting the fault log would the car recover from limp home mode (if that's what the problem is) or is there more for me to do??

What is the turbo regulator valve and how can I test it?

Any ideas or sugestions would be gratefully recieved.

Cheers!