I have the fault code 013128 (Audi A6 2006 2,7 TDI):
19804/P3348/013128 - Control Circuit for Controller for Turbocharger 1 (J724): Electrical Malfunction
When i rev it up to 2600-2800 and quickly lift off the throttle it goes down to idle and revvs start to jump up and down violently, over and over again, i have to shut it off to make it stop. And it makes a lot of black smoke.
The car is in limp mode and the malfunction light is on.
I notice that the actuator rod at the turbo is not moving while revving. It should move from the start while reving right? Or do i need to rev higher than 2000 rpm to see it move?