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Hello, this code is indicating a fault with the VGT actuator solenoid that controls the variable turb boost operation. This would make sense in how you have no boost then lots of boost if this is having a malfunction. There is a pinpoint test requring the use of a multimeter(and preferably a scan tool) to actuate and monitor the solenoid for a circuit fault and the turbo operation. Its not unusual yo see the turbocharger jam up with carbon buildup and restrict its operation as well. If you have access to a scan tool and meter I can provide the pinpoint test.
Do you need more help with this concern?
True, but carbon buildup is the 6.0's biggest issue with the egr and turbocharger plugging up. The VGT actuator could be at fault, the test is written around using a scan tool but you can test the circuit and inspect for any wiring damage to the actuator or connector. If all looks ok, id replace the actuator and retest. click on the attachment to enlarge