So it’s sounds to me like you’re having connection issues with your vgt solenoid connector. It’s a plug in that sits at the top of your turbo

a lot of 6.0 guys use this to make a “smoke switch” where they can turn off the veins of the turbo to roll more coal. A lot of times when removing these on the 6.0’s they side connectors that hold it in break due to the plastic being older. You can buy a new plug at the auto part store and it’s a simple two wire splice if it’s the connector itself.

 

I agree with Harrison, you need to pull the codes though, that might help point you in the right direction.

 

I can actually tell you the exact code that it’s saying it’s code number p0046 turbocharger/supercharger boost control circuit A circuit range/performance. My buddy has a smoke switch and his check engine light is always on for that reason. But you can go to Orileys and use there code reader typically for free. I don’t know if different code readers have the descriptions different but that’s what mine said on his truck.

 

The OP could have an underboost or overboost code. He could also have no codes and have sticking turbo vanes.

 

I thought about the sticking vanes i just didn’t know with it being a brand new turbo or some what brand new. Best thing to do would be to read the code and start working from there.

 

The other thing you could try, start it up cold and lit it sit long enough to see the VGT cycle. You should see steps of VGT and EBP follow each other if the vanes are moving. May not be super helpful if the problem is intermittent, but it still could be of value.