I have a similar problem with my 2009 VX turbo diesel Landcruiser. Have had a scan done which has shown a P004B DTC. ( Turbocharger Boost Control Solenoid 'B" open circuit). Occurs under heavier acceleration resulting in engine going into Limp Mode with loss of power. Usually clears itself overnight. However if I actuate the Cruise Control as soon as I start the engine it does not occur under normal and heavier acceleration. Mechanic advised that I need to replace the Turbocharger Electronic Stepper Motor/Actuator "B" Bank. Booking in vehicle to have this done this week. Will advise outcome.