A friend has a 2010 Peugeot Partner II with a 1.6L turbo diesel engine. It was idling horribly with white smoke and had no power under acceleration. When I floored the accelerator parked it would belch white and black smoke. I hooked up a scan tool and saw 5 EGR codes and guessed that the EGR was stuck open. Pulled the EGR and verified it. EGR solenoid was toast, but was able to force it into the closed position and put it back without plugging in the connector. Engine idled fine after that. However flooring the accelerator was still causing white smoke and when I took it for a test drive it still lacked power. Scan tool shows that the measured turbo pressure is never getting above 1000 mbar - or about 10% above atmospheric pressure up here in the mountains.
Is it possible that the ECU might be in some kind of limp mode and disabling the turbo when it sees a non-functioning EGR?